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htop/hwloc-1.2.1/include/hwloc.h

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/*
* Copyright © 2009 CNRS
* Copyright © 2009-2011 INRIA. All rights reserved.
* Copyright © 2009-2011 Université Bordeaux 1
* Copyright © 2009-2011 Cisco Systems, Inc. All rights reserved.
* See COPYING in top-level directory.
*/
/** \file
* \brief The hwloc API.
*
* See hwloc/bitmap.h for bitmap specific macros.
* See hwloc/helper.h for high-level topology traversal helpers.
*/
#ifndef HWLOC_H
#define HWLOC_H
#include <hwloc/autogen/config.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
/*
* Symbol transforms
*/
#include <hwloc/rename.h>
/*
* Bitmap definitions
*/
#include <hwloc/bitmap.h>
#include <hwloc/cpuset.h>
#ifdef __cplusplus
extern "C" {
#endif
/** \defgroup hwlocality_api_version API version
* @{
*/
/** \brief Indicate at build time which hwloc API version is being used. */
#define HWLOC_API_VERSION 0x00010200
/** \brief Indicate at runtime which hwloc API version was used at build time. */
HWLOC_DECLSPEC unsigned hwloc_get_api_version(void);
/** @} */
/** \defgroup hwlocality_topology Topology context
* @{
*/
struct hwloc_topology;
/** \brief Topology context
*
* To be initialized with hwloc_topology_init() and built with hwloc_topology_load().
*/
typedef struct hwloc_topology * hwloc_topology_t;
/** @} */
/** \defgroup hwlocality_sets Object sets (hwloc_cpuset_t and hwloc_nodeset_t)
*
* Hwloc uses bitmaps to represent two distinct kinds of object sets:
* CPU sets (::hwloc_cpuset_t) and NUMA node sets (::hwloc_nodeset_t).
* These types are both typedefs to a common back end type
* (::hwloc_bitmap_t), and therefore all the hwloc bitmap functions
* are applicable to both ::hwloc_cpuset_t and ::hwloc_nodeset_t (see
* \ref hwlocality_bitmap).
*
* The rationale for having two different types is that even though
* the actions one wants to perform on these types are the same (e.g.,
* enable and disable individual items in the set/mask), they're used
* in very different contexts: one for specifying which processors to
* use and one for specifying which NUMA nodes to use. Hence, the
* name difference is really just to reflect the intent of where the
* type is used.
*
* @{
*/
/** \brief A CPU set is a bitmap whose bits are set according to CPU
* physical OS indexes.
*
* It may be consulted and modified with the bitmap API as any
* ::hwloc_bitmap_t (see hwloc/bitmap.h).
*/
typedef hwloc_bitmap_t hwloc_cpuset_t;
/** \brief A non-modifiable ::hwloc_cpuset_t. */
typedef hwloc_const_bitmap_t hwloc_const_cpuset_t;
/** \brief A node set is a bitmap whose bits are set according to NUMA
* memory node physical OS indexes.
*
* It may be consulted and modified with the bitmap API as any
* ::hwloc_bitmap_t (see hwloc/bitmap.h).
*
* When binding memory on a system without any NUMA node
* (when the whole memory is considered as a single memory bank),
* the nodeset may be either empty (no memory selected)
* or full (whole system memory selected).
*
* See also \ref hwlocality_helper_nodeset_convert.
*/
typedef hwloc_bitmap_t hwloc_nodeset_t;
/** \brief A non-modifiable ::hwloc_nodeset_t.
*/
typedef hwloc_const_bitmap_t hwloc_const_nodeset_t;
/** @} */
/** \defgroup hwlocality_types Topology Object Types
* @{
*/
/** \brief Type of topology object.
*
* \note Do not rely on the ordering or completeness of the values as new ones
* may be defined in the future! If you need to compare types, use
* hwloc_compare_types() instead.
*/
typedef enum {
/* ***************************************************************
WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
If new enum values are added here, you MUST also go update the
obj_type_order[] and obj_order_type[] arrays in src/topology.c.
WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
*************************************************************** */
HWLOC_OBJ_SYSTEM, /**< \brief Whole system (may be a cluster of machines).
* The whole system that is accessible to hwloc.
* That may comprise several machines in SSI systems
* like Kerrighed.
*/
HWLOC_OBJ_MACHINE, /**< \brief Machine.
* The typical root object type.
* A set of processors and memory with cache
* coherency.
*/
HWLOC_OBJ_NODE, /**< \brief NUMA node.
* A set of processors around memory which the
* processors can directly access.
*/
HWLOC_OBJ_SOCKET, /**< \brief Socket, physical package, or chip.
* In the physical meaning, i.e. that you can add
* or remove physically.
*/
HWLOC_OBJ_CACHE, /**< \brief Data cache.
* Can be L1, L2, L3, ...
*/
HWLOC_OBJ_CORE, /**< \brief Core.
* A computation unit (may be shared by several
* logical processors).
*/
HWLOC_OBJ_PU, /**< \brief Processing Unit, or (Logical) Processor.
* An execution unit (may share a core with some
* other logical processors, e.g. in the case of
* an SMT core).
*
* Objects of this kind are always reported and can
* thus be used as fallback when others are not.
*/
HWLOC_OBJ_GROUP, /**< \brief Group objects.
* Objects which do not fit in the above but are
* detected by hwloc and are useful to take into
* account for affinity. For instance, some operating systems
* expose their arbitrary processors aggregation this
* way. And hwloc may insert such objects to group
* NUMA nodes according to their distances.
*
* These objects are ignored when they do not bring
* any structure.
*/
HWLOC_OBJ_MISC, /**< \brief Miscellaneous objects.
* Objects without particular meaning, that can e.g. be
* added by the application for its own use.
*/
HWLOC_OBJ_TYPE_MAX /**< \private Sentinel value */
/* ***************************************************************
WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
If new enum values are added here, you MUST also go update the
obj_type_order[] and obj_order_type[] arrays in src/topology.c.
WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
*************************************************************** */
} hwloc_obj_type_t;
/** \brief Compare the depth of two object types
*
* Types shouldn't be compared as they are, since newer ones may be added in
* the future. This function returns less than, equal to, or greater than zero
* respectively if \p type1 objects usually include \p type2 objects, are the
* same as \p type2 objects, or are included in \p type2 objects. If the types
* can not be compared (because neither is usually contained in the other),
* HWLOC_TYPE_UNORDERED is returned. Object types containing CPUs can always
* be compared (usually, a system contains machines which contain nodes which
* contain sockets which contain caches, which contain cores, which contain
* processors).
*
* \note HWLOC_OBJ_PU will always be the deepest.
* \note This does not mean that the actual topology will respect that order:
* e.g. as of today cores may also contain caches, and sockets may also contain
* nodes. This is thus just to be seen as a fallback comparison method.
*/
HWLOC_DECLSPEC int hwloc_compare_types (hwloc_obj_type_t type1, hwloc_obj_type_t type2) __hwloc_attribute_const;
enum hwloc_compare_types_e {
HWLOC_TYPE_UNORDERED = INT_MAX /**< \brief Value returned by hwloc_compare_types when types can not be compared. \hideinitializer */
};
/** @} */
/** \defgroup hwlocality_objects Topology Objects
* @{
*/
union hwloc_obj_attr_u;
/** \brief Object memory */
struct hwloc_obj_memory_s {
hwloc_uint64_t total_memory; /**< \brief Total memory (in bytes) in this object and its children */
hwloc_uint64_t local_memory; /**< \brief Local memory (in bytes) */
unsigned page_types_len; /**< \brief Size of array \p page_types */
/** \brief Array of local memory page types, \c NULL if no local memory and \p page_types is 0.
*
* The array is sorted by increasing \p size fields.
* It contains \p page_types_len slots.
*/
struct hwloc_obj_memory_page_type_s {
hwloc_uint64_t size; /**< \brief Size of pages */
hwloc_uint64_t count; /**< \brief Number of pages of this size */
} * page_types;
};
/** \brief Structure of a topology object
*
* Applications must not modify any field except hwloc_obj.userdata.
*/
struct hwloc_obj {
/* physical information */
hwloc_obj_type_t type; /**< \brief Type of object */
unsigned os_index; /**< \brief OS-provided physical index number */
char *name; /**< \brief Object description if any */
struct hwloc_obj_memory_s memory; /**< \brief Memory attributes */
union hwloc_obj_attr_u *attr; /**< \brief Object type-specific Attributes,
* may be \c NULL if no attribute value was found */
/* global position */
unsigned depth; /**< \brief Vertical index in the hierarchy */
unsigned logical_index; /**< \brief Horizontal index in the whole list of similar objects,
* could be a "cousin_rank" since it's the rank within the "cousin" list below */
signed os_level; /**< \brief OS-provided physical level, -1 if unknown or meaningless */
/* cousins are all objects of the same type (and depth) across the entire topology */
struct hwloc_obj *next_cousin; /**< \brief Next object of same type and depth */
struct hwloc_obj *prev_cousin; /**< \brief Previous object of same type and depth */
/* children of the same parent are siblings, even if they may have different type and depth */
struct hwloc_obj *parent; /**< \brief Parent, \c NULL if root (system object) */
unsigned sibling_rank; /**< \brief Index in parent's \c children[] array */
struct hwloc_obj *next_sibling; /**< \brief Next object below the same parent */
struct hwloc_obj *prev_sibling; /**< \brief Previous object below the same parent */
/* children array below this object */
unsigned arity; /**< \brief Number of children */
struct hwloc_obj **children; /**< \brief Children, \c children[0 .. arity -1] */
struct hwloc_obj *first_child; /**< \brief First child */
struct hwloc_obj *last_child; /**< \brief Last child */
/* misc */
void *userdata; /**< \brief Application-given private data pointer, initialized to \c NULL, use it as you wish */
/* cpusets and nodesets */
hwloc_cpuset_t cpuset; /**< \brief CPUs covered by this object
*
* This is the set of CPUs for which there are PU objects in the topology
* under this object, i.e. which are known to be physically contained in this
* object and known how (the children path between this object and the PU
* objects).
*
* If the HWLOC_TOPOLOGY_FLAG_WHOLE_SYSTEM configuration flag is set, some of
* these CPUs may be offline, or not allowed for binding, see online_cpuset
* and allowed_cpuset.
*
* \note Its value must not be changed, hwloc_bitmap_dup must be used instead.
*/
hwloc_cpuset_t complete_cpuset; /**< \brief The complete CPU set of logical processors of this object,
*
* This includes not only the same as the cpuset field, but also the CPUs for
* which topology information is unknown or incomplete, and the CPUs that are
* ignored when the HWLOC_TOPOLOGY_FLAG_WHOLE_SYSTEM flag is not set.
* Thus no corresponding PU object may be found in the topology, because the
* precise position is undefined. It is however known that it would be somewhere
* under this object.
*
* \note Its value must not be changed, hwloc_bitmap_dup must be used instead.
*/
hwloc_cpuset_t online_cpuset; /**< \brief The CPU set of online logical processors
*
* This includes the CPUs contained in this object that are online, i.e. draw
* power and can execute threads. It may however not be allowed to bind to
* them due to administration rules, see allowed_cpuset.
*
* \note Its value must not be changed, hwloc_bitmap_dup must be used instead.
*/
hwloc_cpuset_t allowed_cpuset; /**< \brief The CPU set of allowed logical processors
*
* This includes the CPUs contained in this object which are allowed for
* binding, i.e. passing them to the hwloc binding functions should not return
* permission errors. This is usually restricted by administration rules.
* Some of them may however be offline so binding to them may still not be
* possible, see online_cpuset.
*
* \note Its value must not be changed, hwloc_bitmap_dup must be used instead.
*/
hwloc_nodeset_t nodeset; /**< \brief NUMA nodes covered by this object or containing this object
*
* This is the set of NUMA nodes for which there are NODE objects in the
* topology under or above this object, i.e. which are known to be physically
* contained in this object or containing it and known how (the children path
* between this object and the NODE objects).
*
* In the end, these nodes are those that are close to the current object.
*
* If the HWLOC_TOPOLOGY_FLAG_WHOLE_SYSTEM configuration flag is set, some of
* these nodes may not be allowed for allocation, see allowed_nodeset.
*
* If there are no NUMA nodes in the machine, all the memory is close to this
* object, so \p nodeset is full.
*
* \note Its value must not be changed, hwloc_bitmap_dup must be used instead.
*/
hwloc_nodeset_t complete_nodeset; /**< \brief The complete NUMA node set of this object,
*
* This includes not only the same as the nodeset field, but also the NUMA
* nodes for which topology information is unknown or incomplete, and the nodes
* that are ignored when the HWLOC_TOPOLOGY_FLAG_WHOLE_SYSTEM flag is not set.
* Thus no corresponding NODE object may be found in the topology, because the
* precise position is undefined. It is however known that it would be
* somewhere under this object.
*
* If there are no NUMA nodes in the machine, all the memory is close to this
* object, so \p complete_nodeset is full.
*
* \note Its value must not be changed, hwloc_bitmap_dup must be used instead.
*/
hwloc_nodeset_t allowed_nodeset; /**< \brief The set of allowed NUMA memory nodes
*
* This includes the NUMA memory nodes contained in this object which are
* allowed for memory allocation, i.e. passing them to NUMA node-directed
* memory allocation should not return permission errors. This is usually
* restricted by administration rules.
*
* If there are no NUMA nodes in the machine, all the memory is close to this
* object, so \p allowed_nodeset is full.
*
* \note Its value must not be changed, hwloc_bitmap_dup must be used instead.
*/
struct hwloc_distances_s **distances; /**< \brief Distances between all objects at same depth below this object */
unsigned distances_count;
struct hwloc_obj_info_s *infos; /**< \brief Array of stringified info type=name. */
unsigned infos_count; /**< \brief Size of infos array. */
};
/**
* \brief Convenience typedef; a pointer to a struct hwloc_obj.
*/
typedef struct hwloc_obj * hwloc_obj_t;
/** \brief Object type-specific Attributes */
union hwloc_obj_attr_u {
/** \brief Cache-specific Object Attributes */
struct hwloc_cache_attr_s {
hwloc_uint64_t size; /**< \brief Size of cache in bytes */
unsigned depth; /**< \brief Depth of cache */
unsigned linesize; /**< \brief Cache-line size in bytes */
} cache;
/** \brief Group-specific Object Attributes */
struct hwloc_group_attr_s {
unsigned depth; /**< \brief Depth of group object */
} group;
};
/** \brief Distances between objects
*
* One object may contain a distance structure describing distances
* between all its descendants at a given relative depth. If the
* containing object is the root object of the topology, then the
* distances are available for all objects in the machine.
*
* The distance may be a memory latency, as defined by the ACPI SLIT
* specification. If so, the \p latency pointer will not be \c NULL
* and the pointed array will contain non-zero values.
*
* In the future, some other types of distances may be considered.
* In these cases, \p latency will be \c NULL.
*/
struct hwloc_distances_s {
unsigned relative_depth; /**< \brief Relative depth of the considered objects
* below the object containing this distance information. */
unsigned nbobjs; /**< \brief Number of objects considered in the matrix.
* It is the number of descendant objects at \p relative_depth
* below the containing object.
* It corresponds to the result of hwloc_get_nbobjs_inside_cpuset_by_depth. */
float *latency; /**< \brief Matrix of latencies between objects, stored as a one-dimension array.
* May be \c NULL if the distances considered here are not latencies.
* Values are normalized to get 1.0 as the minimal value in the matrix.
* Latency from i-th to j-th object is stored in slot i*nbobjs+j.
*/
float latency_max; /**< \brief The maximal value in the latency matrix. */
float latency_base; /**< \brief The multiplier that should be applied to latency matrix
* to retrieve the original OS-provided latencies.
* Usually 10 on Linux since ACPI SLIT uses 10 for local latency.
*/
};
/** \brief Object info */
struct hwloc_obj_info_s {
char *name; /**< \brief Info name */
char *value; /**< \brief Info value */
};
/** @} */
/** \defgroup hwlocality_creation Create and Destroy Topologies
* @{
*/
/** \brief Allocate a topology context.
*
* \param[out] topologyp is assigned a pointer to the new allocated context.
*
* \return 0 on success, -1 on error.
*/
HWLOC_DECLSPEC int hwloc_topology_init (hwloc_topology_t *topologyp);
/** \brief Build the actual topology
*
* Build the actual topology once initialized with hwloc_topology_init() and
* tuned with \ref hwlocality_configuration routines.
* No other routine may be called earlier using this topology context.
*
* \param topology is the topology to be loaded with objects.
*
* \return 0 on success, -1 on error.
*
* \sa hwlocality_configuration
*/
HWLOC_DECLSPEC int hwloc_topology_load(hwloc_topology_t topology);
/** \brief Terminate and free a topology context
*
* \param topology is the topology to be freed
*/
HWLOC_DECLSPEC void hwloc_topology_destroy (hwloc_topology_t topology);
/** \brief Run internal checks on a topology structure
*
* \param topology is the topology to be checked
*/
HWLOC_DECLSPEC void hwloc_topology_check(hwloc_topology_t topology);
/** @} */
/** \defgroup hwlocality_configuration Configure Topology Detection
*
* These functions can optionally be called between hwloc_topology_init() and
* hwloc_topology_load() to configure how the detection should be performed,
* e.g. to ignore some objects types, define a synthetic topology, etc.
*
* If none of them is called, the default is to detect all the objects of the
* machine that the caller is allowed to access.
*
* This default behavior may also be modified through environment variables
* if the application did not modify it already.
* Setting HWLOC_XMLFILE in the environment enforces the discovery from a XML
* file as if hwloc_topology_set_xml() had been called.
* HWLOC_FSROOT switches to reading the topology from the specified Linux
* filesystem root as if hwloc_topology_set_fsroot() had been called.
* Finally, HWLOC_THISSYSTEM enforces the return value of
* hwloc_topology_is_thissystem().
*
* @{
*/
/** \brief Ignore an object type.
*
* Ignore all objects from the given type.
* The bottom-level type HWLOC_OBJ_PU may not be ignored.
* The top-level object of the hierarchy will never be ignored, even if this function
* succeeds.
*/
HWLOC_DECLSPEC int hwloc_topology_ignore_type(hwloc_topology_t topology, hwloc_obj_type_t type);
/** \brief Ignore an object type if it does not bring any structure.
*
* Ignore all objects from the given type as long as they do not bring any structure:
* Each ignored object should have a single children or be the only child of its parent.
* The bottom-level type HWLOC_OBJ_PU may not be ignored.
*/
HWLOC_DECLSPEC int hwloc_topology_ignore_type_keep_structure(hwloc_topology_t topology, hwloc_obj_type_t type);
/** \brief Ignore all objects that do not bring any structure.
*
* Ignore all objects that do not bring any structure:
* Each ignored object should have a single children or be the only child of its parent.
*/
HWLOC_DECLSPEC int hwloc_topology_ignore_all_keep_structure(hwloc_topology_t topology);
/** \brief Flags to be set onto a topology context before load.
*
* Flags should be given to hwloc_topology_set_flags().
*/
enum hwloc_topology_flags_e {
HWLOC_TOPOLOGY_FLAG_WHOLE_SYSTEM = (1<<0),
/**< \brief Detect the whole system, ignore reservations and offline settings.
* \hideinitializer
*
* Gather all resources, even if some were disabled by the administrator.
* For instance, ignore Linux Cpusets and gather all processors and memory nodes,
* and ignore the fact that some resources may be offline.
*/
HWLOC_TOPOLOGY_FLAG_IS_THISSYSTEM = (1<<1)
/**< \brief Assume that the selected backend provides the topology for the
* system on which we are running.
* \hideinitializer
*
* This forces hwloc_topology_is_thissystem to return 1, i.e. makes hwloc assume that
* the selected backend provides the topology for the system on which we are running,
* even if it is not the OS-specific backend but the XML backend for instance.
* This means making the binding functions actually call the OS-specific
* system calls and really do binding, while the XML backend would otherwise
* provide empty hooks just returning success.
*
* Setting the environment variable HWLOC_THISSYSTEM may also result in the
* same behavior.
*
* This can be used for efficiency reasons to first detect the topology once,
* save it to an XML file, and quickly reload it later through the XML
* backend, but still having binding functions actually do bind.
*/
};
/** \brief Set OR'ed flags to non-yet-loaded topology.
*
* Set a OR'ed set of ::hwloc_topology_flags_e onto a topology that was not yet loaded.
*/
HWLOC_DECLSPEC int hwloc_topology_set_flags (hwloc_topology_t topology, unsigned long flags);
/** \brief Change the file-system root path when building the topology from sysfs/procfs.
*
* On Linux system, use sysfs and procfs files as if they were mounted on the given
* \p fsroot_path instead of the main file-system root. Setting the environment
* variable HWLOC_FSROOT may also result in this behavior.
* Not using the main file-system root causes hwloc_topology_is_thissystem()
* to return 0.
*
* \note For conveniency, this backend provides empty binding hooks which just
* return success. To have hwloc still actually call OS-specific hooks, the
* HWLOC_TOPOLOGY_FLAG_IS_THISSYSTEM has to be set to assert that the loaded
* file is really the underlying system.
*/
HWLOC_DECLSPEC int hwloc_topology_set_fsroot(hwloc_topology_t __hwloc_restrict topology, const char * __hwloc_restrict fsroot_path);
/** \brief Change which pid the topology is viewed from
*
* On some systems, processes may have different views of the machine, for
* instance the set of allowed CPUs. By default, hwloc exposes the view from
* the current process. Calling hwloc_topology_set_pid() permits to make it
* expose the topology of the machine from the point of view of another
* process.
*
* \note hwloc_pid_t is pid_t on unix platforms, and HANDLE on native Windows
* platforms
* \note -1 is returned and errno is set to ENOSYS on platforms that do not
* support this feature.
*/
HWLOC_DECLSPEC int hwloc_topology_set_pid(hwloc_topology_t __hwloc_restrict topology, hwloc_pid_t pid);
/** \brief Enable synthetic topology.
*
* Gather topology information from the given \p description
* which should be a space-separated string of numbers describing
* the arity of each level.
* Each number may be prefixed with a type and a colon to enforce the type
* of a level. If only some level types are enforced, hwloc will try to
* choose the other types according to usual topologies, but it may fail
* and you may have to specify more level types manually.
*
* If \p description was properly parsed and describes a valid topology
* configuration, this function returns 0.
* Otherwise -1 is returned and errno is set to EINVAL.
*
* \note For conveniency, this backend provides empty binding hooks which just
* return success.
*/
HWLOC_DECLSPEC int hwloc_topology_set_synthetic(hwloc_topology_t __hwloc_restrict topology, const char * __hwloc_restrict description);
/** \brief Enable XML-file based topology.
*
* Gather topology information from the XML file given at \p xmlpath.
* Setting the environment variable HWLOC_XMLFILE may also result in this behavior.
* This file may have been generated earlier with lstopo file.xml.
*
* \note For conveniency, this backend provides empty binding hooks which just
* return success. To have hwloc still actually call OS-specific hooks, the
* HWLOC_TOPOLOGY_FLAG_IS_THISSYSTEM has to be set to assert that the loaded
* file is really the underlying system.
*/
HWLOC_DECLSPEC int hwloc_topology_set_xml(hwloc_topology_t __hwloc_restrict topology, const char * __hwloc_restrict xmlpath);
/** \brief Enable XML based topology using a memory buffer instead of a file.
*
* Gather topology information from the XML memory buffer given at \p buffer
* and of length \p length.
*/
HWLOC_DECLSPEC int hwloc_topology_set_xmlbuffer(hwloc_topology_t __hwloc_restrict topology, const char * __hwloc_restrict buffer, int size);
/** \brief Provide a distance matrix.
*
* Provide the matrix of distances between a set of objects of the given type.
* The set may or may not contain all the existing objects of this type.
* The objects are specified by their OS/physical index in the \p os_index
* array. The \p distances matrix follows the same order.
* The distance from object i to object j in the i*nbobjs+j.
*/
HWLOC_DECLSPEC int hwloc_topology_set_distance_matrix(hwloc_topology_t __hwloc_restrict topology,
hwloc_obj_type_t type, unsigned nbobjs,
unsigned *os_index, float *distances);
/** \brief Flags describing actual discovery support for this topology. */
struct hwloc_topology_discovery_support {
/** \brief Detecting the number of PU objects is supported. */
unsigned char pu;
};
/** \brief Flags describing actual PU binding support for this topology. */
struct hwloc_topology_cpubind_support {
/** Binding the whole current process is supported. */
unsigned char set_thisproc_cpubind;
/** Getting the binding of the whole current process is supported. */
unsigned char get_thisproc_cpubind;
/** Binding a whole given process is supported. */
unsigned char set_proc_cpubind;
/** Getting the binding of a whole given process is supported. */
unsigned char get_proc_cpubind;
/** Binding the current thread only is supported. */
unsigned char set_thisthread_cpubind;
/** Getting the binding of the current thread only is supported. */
unsigned char get_thisthread_cpubind;
/** Binding a given thread only is supported. */
unsigned char set_thread_cpubind;
/** Getting the binding of a given thread only is supported. */
unsigned char get_thread_cpubind;
/** Getting the last processors where the whole current process ran is supported */
unsigned char get_thisproc_last_cpu_location;
/** Getting the last processors where a whole process ran is supported */
unsigned char get_proc_last_cpu_location;
/** Getting the last processors where the current thread ran is supported */
unsigned char get_thisthread_last_cpu_location;
};
/** \brief Flags describing actual memory binding support for this topology. */
struct hwloc_topology_membind_support {
/** Binding the whole current process is supported. */
unsigned char set_thisproc_membind;
/** Getting the binding of the whole current process is supported. */
unsigned char get_thisproc_membind;
/** Binding a whole given process is supported. */
unsigned char set_proc_membind;
/** Getting the binding of a whole given process is supported. */
unsigned char get_proc_membind;
/** Binding the current thread only is supported. */
unsigned char set_thisthread_membind;
/** Getting the binding of the current thread only is supported. */
unsigned char get_thisthread_membind;
/** Binding a given memory area is supported. */
unsigned char set_area_membind;
/** Getting the binding of a given memory area is supported. */
unsigned char get_area_membind;
/** Allocating a bound memory area is supported. */
unsigned char alloc_membind;
/** First-touch policy is supported. */
unsigned char firsttouch_membind;
/** Bind policy is supported. */
unsigned char bind_membind;
/** Interleave policy is supported. */
unsigned char interleave_membind;
/** Replication policy is supported. */
unsigned char replicate_membind;
/** Next-touch migration policy is supported. */
unsigned char nexttouch_membind;
/** Migration flags is supported. */
unsigned char migrate_membind;
};
/** \brief Set of flags describing actual support for this topology.
*
* This is retrieved with hwloc_topology_get_support() and will be valid until
* the topology object is destroyed. Note: the values are correct only after
* discovery.
*/
struct hwloc_topology_support {
struct hwloc_topology_discovery_support *discovery;
struct hwloc_topology_cpubind_support *cpubind;
struct hwloc_topology_membind_support *membind;
};
/** \brief Retrieve the topology support. */
HWLOC_DECLSPEC const struct hwloc_topology_support *hwloc_topology_get_support(hwloc_topology_t __hwloc_restrict topology);
/** @} */
/** \defgroup hwlocality_tinker Tinker with topologies.
* @{
*/
/** \brief Export the topology into an XML file.
*
* This file may be loaded later through hwloc_topology_set_xml().
*/
HWLOC_DECLSPEC void hwloc_topology_export_xml(hwloc_topology_t topology, const char *xmlpath);
/** \brief Export the topology into a newly-allocated XML memory buffer.
*
* \p xmlbuffer is allocated by the callee and should be freed with xmlFree later in the caller.
*
* This memory buffer may be loaded later through hwloc_topology_set_xmlbuffer().
*/
HWLOC_DECLSPEC void hwloc_topology_export_xmlbuffer(hwloc_topology_t topology, char **xmlbuffer, int *buflen);
/** \brief Add a MISC object to the topology
*
* A new MISC object will be created and inserted into the topology at the
* position given by bitmap \p cpuset. This offers a way to add new
* intermediate levels to the topology hierarchy.
*
* \p cpuset and \p name will be copied to setup the new object attributes.
*
* \return the newly-created object.
* \return \c NULL if the insertion conflicts with the existing topology tree.
*/
HWLOC_DECLSPEC hwloc_obj_t hwloc_topology_insert_misc_object_by_cpuset(hwloc_topology_t topology, hwloc_const_cpuset_t cpuset, const char *name);
/** \brief Add a MISC object as a leaf of the topology
*
* A new MISC object will be created and inserted into the topology at the
* position given by parent. It is appended to the list of existing children,
* without ever adding any intermediate hierarchy level. This is useful for
* annotating the topology without actually changing the hierarchy.
*
* \p name will be copied to the setup the new object attributes.
* However, the new leaf object will not have any \p cpuset.
*
* \return the newly-created object
*/
HWLOC_DECLSPEC hwloc_obj_t hwloc_topology_insert_misc_object_by_parent(hwloc_topology_t topology, hwloc_obj_t parent, const char *name);
/** \brief Flags to be given to hwloc_topology_restrict(). */
enum hwloc_restrict_flags_e {
HWLOC_RESTRICT_FLAG_ADAPT_DISTANCES = (1<<0),
/**< \brief Adapt distance matrices according to objects being removed during restriction.
* If this flag is not set, distance matrices are removed.
* \hideinitializer
*/
HWLOC_RESTRICT_FLAG_ADAPT_MISC = (1<<1)
/**< \brief Move Misc objects to ancestors if their parents are removed during restriction.
* If this flag is not set, Misc objects are removed when their parents are removed.
* \hideinitializer
*/
};
/** \brief Restrict the topology to the given CPU set.
*
* Topology \p topology is modified so as to remove all objects that
* are not included (or partially included) in the CPU set \p cpuset.
* All objects CPU and node sets are restricted accordingly.
*
* \p flags is a OR'ed set of ::hwloc_restrict_flags_e.
*
* \note This call may not be reverted by restricting back to a larger
* cpuset. Once dropped during restriction, objects may not be brought
* back, except by reloading the entire topology with hwloc_topology_load().
*/
HWLOC_DECLSPEC int hwloc_topology_restrict(hwloc_topology_t __hwloc_restrict topology, hwloc_const_cpuset_t cpuset, unsigned long flags);
/** @} */
/** \defgroup hwlocality_information Get some Topology Information
* @{
*/
/** \brief Get the depth of the hierachical tree of objects.
*
* This is the depth of HWLOC_OBJ_PU objects plus one.
*/
HWLOC_DECLSPEC unsigned hwloc_topology_get_depth(hwloc_topology_t __hwloc_restrict topology) __hwloc_attribute_pure;
/** \brief Returns the depth of objects of type \p type.
*
* If no object of this type is present on the underlying architecture, or if
* the OS doesn't provide this kind of information, the function returns
* HWLOC_TYPE_DEPTH_UNKNOWN.
*
* If type is absent but a similar type is acceptable, see also
* hwloc_get_type_or_below_depth() and hwloc_get_type_or_above_depth().
*
* If some objects of the given type exist in different levels, for instance
* L1 and L2 caches, the function returns HWLOC_TYPE_DEPTH_MULTIPLE.
*/
HWLOC_DECLSPEC int hwloc_get_type_depth (hwloc_topology_t topology, hwloc_obj_type_t type);
enum hwloc_get_type_depth_e {
HWLOC_TYPE_DEPTH_UNKNOWN = -1, /**< \brief No object of given type exists in the topology. \hideinitializer */
HWLOC_TYPE_DEPTH_MULTIPLE = -2 /**< \brief Objects of given type exist at different depth in the topology. \hideinitializer */
};
/** \brief Returns the type of objects at depth \p depth.
*
* \return -1 if depth \p depth does not exist.
*/
HWLOC_DECLSPEC hwloc_obj_type_t hwloc_get_depth_type (hwloc_topology_t topology, unsigned depth) __hwloc_attribute_pure;
/** \brief Returns the width of level at depth \p depth */
HWLOC_DECLSPEC unsigned hwloc_get_nbobjs_by_depth (hwloc_topology_t topology, unsigned depth) __hwloc_attribute_pure;
/** \brief Returns the width of level type \p type
*
* If no object for that type exists, 0 is returned.
* If there are several levels with objects of that type, -1 is returned.
*/
static __hwloc_inline int __hwloc_attribute_pure
hwloc_get_nbobjs_by_type (hwloc_topology_t topology, hwloc_obj_type_t type)
{
int depth = hwloc_get_type_depth(topology, type);
if (depth == HWLOC_TYPE_DEPTH_UNKNOWN)
return 0;
if (depth == HWLOC_TYPE_DEPTH_MULTIPLE)
return -1; /* FIXME: agregate nbobjs from different levels? */
return hwloc_get_nbobjs_by_depth(topology, depth);
}
/** \brief Does the topology context come from this system?
*
* \return 1 if this topology context was built using the system
* running this program.
* \return 0 instead (for instance if using another file-system root,
* a XML topology file, or a synthetic topology).
*/
HWLOC_DECLSPEC int hwloc_topology_is_thissystem(hwloc_topology_t __hwloc_restrict topology) __hwloc_attribute_pure;
/** @} */
/** \defgroup hwlocality_traversal Retrieve Objects
* @{
*/
/** \brief Returns the topology object at logical index \p idx from depth \p depth */
HWLOC_DECLSPEC hwloc_obj_t hwloc_get_obj_by_depth (hwloc_topology_t topology, unsigned depth, unsigned idx) __hwloc_attribute_pure;
/** \brief Returns the topology object at logical index \p idx with type \p type
*
* If no object for that type exists, \c NULL is returned.
* If there are several levels with objects of that type, \c NULL is returned
* and ther caller may fallback to hwloc_get_obj_by_depth().
*/
static __hwloc_inline hwloc_obj_t __hwloc_attribute_pure
hwloc_get_obj_by_type (hwloc_topology_t topology, hwloc_obj_type_t type, unsigned idx)
{
int depth = hwloc_get_type_depth(topology, type);
if (depth == HWLOC_TYPE_DEPTH_UNKNOWN)
return NULL;
if (depth == HWLOC_TYPE_DEPTH_MULTIPLE)
return NULL;
return hwloc_get_obj_by_depth(topology, depth, idx);
}
/** @} */
/** \defgroup hwlocality_conversion Object/String Conversion
* @{
*/
/** \brief Return a stringified topology object type */
HWLOC_DECLSPEC const char * hwloc_obj_type_string (hwloc_obj_type_t type) __hwloc_attribute_const;
/** \brief Return an object type from the string
*
* \return -1 if unrecognized.
*/
HWLOC_DECLSPEC hwloc_obj_type_t hwloc_obj_type_of_string (const char * string) __hwloc_attribute_pure;
/** \brief Stringify the type of a given topology object into a human-readable form.
*
* It differs from hwloc_obj_type_string() because it prints type attributes such
* as cache depth.
*
* If \p size is 0, \p string may safely be \c NULL.
*
* \return the number of character that were actually written if not truncating,
* or that would have been written (not including the ending \\0).
*/
HWLOC_DECLSPEC int hwloc_obj_type_snprintf(char * __hwloc_restrict string, size_t size, hwloc_obj_t obj,
int verbose);
/** \brief Stringify the attributes of a given topology object into a human-readable form.
*
* Attribute values are separated by \p separator.
*
* Only the major attributes are printed in non-verbose mode.
*
* If \p size is 0, \p string may safely be \c NULL.
*
* \return the number of character that were actually written if not truncating,
* or that would have been written (not including the ending \\0).
*/
HWLOC_DECLSPEC int hwloc_obj_attr_snprintf(char * __hwloc_restrict string, size_t size, hwloc_obj_t obj, const char * __hwloc_restrict separator,
int verbose);
/** \brief Stringify a given topology object into a human-readable form.
*
* \note This function is deprecated in favor of hwloc_obj_type_snprintf()
* and hwloc_obj_attr_snprintf() since it is not very flexible and
* only prints physical/OS indexes.
*
* Fill string \p string up to \p size characters with the description
* of topology object \p obj in topology \p topology.
*
* If \p verbose is set, a longer description is used. Otherwise a
* short description is used.
*
* \p indexprefix is used to prefix the \p os_index attribute number of
* the object in the description. If \c NULL, the \c # character is used.
*
* If \p size is 0, \p string may safely be \c NULL.
*
* \return the number of character that were actually written if not truncating,
* or that would have been written (not including the ending \\0).
*/
HWLOC_DECLSPEC int hwloc_obj_snprintf(char * __hwloc_restrict string, size_t size,
hwloc_topology_t topology, hwloc_obj_t obj,
const char * __hwloc_restrict indexprefix, int verbose);
/** \brief Stringify the cpuset containing a set of objects.
*
* If \p size is 0, \p string may safely be \c NULL.
*
* \return the number of character that were actually written if not truncating,
* or that would have been written (not including the ending \\0).
*/
HWLOC_DECLSPEC int hwloc_obj_cpuset_snprintf(char * __hwloc_restrict str, size_t size, size_t nobj, const hwloc_obj_t * __hwloc_restrict objs);
/** \brief Search the given key name in object infos and return the corresponding value.
*
* \return \c NULL if no such key exists.
*/
static __hwloc_inline char * __hwloc_attribute_pure
hwloc_obj_get_info_by_name(hwloc_obj_t obj, const char *name)
{
unsigned i;
for(i=0; i<obj->infos_count; i++)
if (!strcmp(obj->infos[i].name, name))
return obj->infos[i].value;
return NULL;
}
/** @} */
/** \defgroup hwlocality_cpubinding CPU binding
*
* It is often useful to call hwloc_bitmap_singlify() first so that a single CPU
* remains in the set. This way, the process will not even migrate between
* different CPUs. Some operating systems also only support that kind of binding.
*
* \note Some operating systems do not provide all hwloc-supported
* mechanisms to bind processes, threads, etc. and the corresponding
* binding functions may fail. -1 is returned and errno is set to
* ENOSYS when it is not possible to bind the requested kind of object
* processes/threads. errno is set to EXDEV when the requested cpuset
* can not be enforced (e.g. some systems only allow one CPU, and some
* other systems only allow one NUMA node).
*
* The most portable version that should be preferred over the others, whenever
* possible, is
*
* \code
* hwloc_set_cpubind(topology, set, 0),
* \endcode
*
* as it just binds the current program, assuming it is single-threaded, or
*
* \code
* hwloc_set_cpubind(topology, set, HWLOC_CPUBIND_THREAD),
* \endcode
*
* which binds the current thread of the current program (which may be
* multithreaded).
*
* \note To unbind, just call the binding function with either a full cpuset or
* a cpuset equal to the system cpuset.
*
* \note On some operating systems, CPU binding may have effects on memory binding, see
* ::HWLOC_CPUBIND_NOMEMBIND
*
* Running lstopo --top can be a very convenient tool to check how binding
* actually happened.
* @{
*/
/** \brief Process/Thread binding flags.
*
* These bit flags can be used to refine the binding policy.
*
* The default (0) is to bind the current process, assumed to be
* single-threaded, in a non-strict way. This is the most portable
* way to bind as all operating systems usually provide it.
*
* \note Not all systems support all kinds of binding. See the
* "Detailed Description" section of \ref hwlocality_cpubinding for a
* description of errors that can occur.
*/
typedef enum {
HWLOC_CPUBIND_PROCESS = (1<<0), /**< \brief Bind all threads of the current
* (possibly) multithreaded process.
* \hideinitializer */
HWLOC_CPUBIND_THREAD = (1<<1), /**< \brief Bind current thread of current process.
* \hideinitializer */
HWLOC_CPUBIND_STRICT = (1<<2), /**< \brief Request for strict binding from the OS.
* \hideinitializer
*
* By default, when the designated CPUs are
* all busy while other CPUs are idle, operating systems
* may execute the thread/process on those
* other CPUs instead of the designated CPUs,
* to let them progress anyway. Strict
* binding means that the thread/process will
* _never_ execute on other cpus than the
* designated CPUs, even when those are busy
* with other tasks and other CPUs are idle.
*
* \note Depending on the operating system,
* strict binding may not be
* possible (e.g., the OS does not implement it) or not
* allowed (e.g., for an administrative reasons), and the
* function will fail in that case.
*
* When retrieving the binding of a process,
* this flag checks whether all its threads
* actually have the same binding.
* If the flag is not given, the binding of
* each thread will be accumulated.
*
* \note This flag is meaningless when retrieving
* the binding of a thread.
*/
HWLOC_CPUBIND_NOMEMBIND = (1<<3)/**< \brief Avoid any effect on memory binding
* \hideinitializer
*
* On some operating systems, some CPU binding function
* would also bind the memory on the
* corresponding NUMA node. It is often not
* a problem for the application, but if it
* is, setting this flag will make hwloc
* avoid using OS functions that would also
* bind memory. This will however reduce the
* support of CPU bindings, i.e. potentially
* return -1 with errno set to ENOSYS in some
* cases.
*/
} hwloc_cpubind_flags_t;
/** \brief Bind current process or thread on cpus given in bitmap \p set
*
* \return -1 with errno set to ENOSYS if the action is not supported
* \return -1 with errno set to EXDEV if the binding cannot be enforced
*/
HWLOC_DECLSPEC int hwloc_set_cpubind(hwloc_topology_t topology, hwloc_const_cpuset_t set, int flags);
/** \brief Get current process or thread binding
*
* Writes into \p set the cpuset which the process or thread (according to \e
* flags) was last bound to.
*/
HWLOC_DECLSPEC int hwloc_get_cpubind(hwloc_topology_t topology, hwloc_cpuset_t set, int flags);
/** \brief Bind a process \p pid on cpus given in bitmap \p set
*
* \note hwloc_pid_t is pid_t on unix platforms, and HANDLE on native Windows
* platforms
*
* \note HWLOC_CPUBIND_THREAD can not be used in \p flags.
*/
HWLOC_DECLSPEC int hwloc_set_proc_cpubind(hwloc_topology_t topology, hwloc_pid_t pid, hwloc_const_cpuset_t set, int flags);
/** \brief Get the current binding of process \p pid
*
* \note hwloc_pid_t is pid_t on unix platforms, and HANDLE on native Windows
* platforms
*
* \note HWLOC_CPUBIND_THREAD can not be used in \p flags.
*/
HWLOC_DECLSPEC int hwloc_get_proc_cpubind(hwloc_topology_t topology, hwloc_pid_t pid, hwloc_cpuset_t set, int flags);
#ifdef hwloc_thread_t
/** \brief Bind a thread \p thread on cpus given in bitmap \p set
*
* \note hwloc_thread_t is pthread_t on unix platforms, and HANDLE on native
* Windows platforms
*
* \note HWLOC_CPUBIND_PROCESS can not be used in \p flags.
*/
HWLOC_DECLSPEC int hwloc_set_thread_cpubind(hwloc_topology_t topology, hwloc_thread_t thread, hwloc_const_cpuset_t set, int flags);
#endif
#ifdef hwloc_thread_t
/** \brief Get the current binding of thread \p tid
*
* \note hwloc_thread_t is pthread_t on unix platforms, and HANDLE on native
* Windows platforms
*
* \note HWLOC_CPUBIND_PROCESS can not be used in \p flags.
*/
HWLOC_DECLSPEC int hwloc_get_thread_cpubind(hwloc_topology_t topology, hwloc_thread_t tid, hwloc_cpuset_t set, int flags);
#endif
/** \brief Get the last CPU where the current process or thread ran.
*
* The operating system may move some tasks from one processor
* to another at any time according to their binding,
* so this function may return something that is already
* outdated.
*/
HWLOC_DECLSPEC int hwloc_get_last_cpu_location(hwloc_topology_t topology, hwloc_cpuset_t set, int flags);
/** \brief Get the last CPU where a process ran.
*
* The operating system may move some tasks from one processor
* to another at any time according to their binding,
* so this function may return something that is already
* outdated.
*
* \note HWLOC_CPUBIND_THREAD can not be used in \p flags.
*/
HWLOC_DECLSPEC int hwloc_get_proc_last_cpu_location(hwloc_topology_t topology, hwloc_pid_t pid, hwloc_cpuset_t set, int flags);
/** @} */
/** \defgroup hwlocality_membinding Memory binding
*
* \note Not all operating systems support all ways to bind existing
* allocated memory (e.g., migration), future memory allocation,
* explicit memory allocation, etc. Using a binding flag or policy
* that is not supported by the underlying OS will cause hwloc's
* binding functions to fail and return -1. errno will be set to
* ENOSYS when the system does support the specified action or policy
* (e.g., some systems only allow binding memory on a per-thread
* basis, whereas other systems only allow binding memory for all
* threads in a process). errno will be set to EXDEV when the
* requested cpuset can not be enforced (e.g., some systems only allow
* binding memory to a single NUMA node).
*
* The most portable form that should be preferred over the others
* whenever possible is as follows:
*
* \code
* hwloc_alloc_membind_policy(topology, size, set,
* HWLOC_MEMBIND_DEFAULT, 0);
* \endcode
*
* This will allocate some memory hopefully bound to the specified set.
* To do so, hwloc will possibly have to change the current memory
* binding policy in order to actually get the memory bound, if the OS
* does not provide any other way to simply allocate bound memory
* without changing the policy for all allocations. That is the
* difference with hwloc_alloc_membind(), which will never change the
* current memory binding policy. Note that since HWLOC_MEMBIND_STRICT
* was not specified, failures to bind will not be reported --
* generally, only memory allocation failures will be reported (e.g.,
* even a plain malloc() would have failed with ENOMEM).
*
* Each hwloc memory binding function is available in two forms: one
* that takes a CPU set argument and another that takes a NUMA memory
* node set argument (see \ref hwlocality_sets and \ref
* hwlocality_bitmap for a discussion of CPU sets and NUMA memory node
* sets). The names of the latter form end with _nodeset. It is also
* possible to convert between CPU set and node set using
* hwloc_cpuset_to_nodeset() or hwloc_cpuset_from_nodeset().
*
* \note On some operating systems, memory binding affects the CPU
* binding; see ::HWLOC_MEMBIND_NOCPUBIND
* @{
*/
/** \brief Memory binding policy.
*
* These constants can be used to choose the binding policy. Only one policy can
* be used at a time (i.e., the values cannot be OR'ed together).
*
* \note Not all systems support all kinds of binding. See the
* "Detailed Description" section of \ref hwlocality_membinding for a
* description of errors that can occur.
*/
typedef enum {
HWLOC_MEMBIND_DEFAULT = 0, /**< \brief Reset the memory allocation policy to the system default.
* \hideinitializer */
HWLOC_MEMBIND_FIRSTTOUCH = 1, /**< \brief Allocate memory
* but do not immediately bind
* it to a specific locality.
* Instead, each page in the
* allocation is bound only
* when it is first touched.
* Pages are individually
* bound to the local NUMA
* node of the first thread
* that touches it.
* \hideinitializer */
HWLOC_MEMBIND_BIND = 2, /**< \brief Allocate memory on the specified nodes.
* \hideinitializer */
HWLOC_MEMBIND_INTERLEAVE = 3, /**< \brief Allocate memory on
* the given nodes in an
* interleaved / round-robin
* manner. The precise layout
* of the memory across
* multiple NUMA nodes is
* OS/system specific.
* Interleaving can be useful
* when threads distributed across
* the specified NUMA nodes
* will all be accessing the whole
* memory range concurrently, since
* the interleave will then balance
* the memory references.
* \hideinitializer */
HWLOC_MEMBIND_REPLICATE = 4, /**< \brief Replicate memory
* on the given nodes; reads
* from this memory will
* attempt to be serviced from
* the NUMA node local to the
* reading thread.
* Replicating can be useful
* when multiple threads from
* the specified NUMA nodes
* will be sharing the same
* read-only data.
*
* This policy can only be
* used with existing memory
* allocations (i.e., the
* hwloc_set_*membind*()
* functions); it cannot be
* used with functions that
* allocate new memory (i.e.,
* the hwloc_alloc*()
* functions).
* \hideinitializer */
HWLOC_MEMBIND_NEXTTOUCH = 5, /**< \brief For each page bound
* with this policy, by next time
* it is touched (and next time only),
* it is moved from
* its current location to the
* local NUMA node of the
* thread where the memory
* reference occurred (if it
* needs to be moved at all).
* \hideinitializer */
HWLOC_MEMBIND_MIXED = -1 /**< \brief Returned by hwloc_get_membind*()
* functions when multiple threads or
* parts of a memory area have
* differing memory binding policies.
* \hideinitializer */
} hwloc_membind_policy_t;
/** \brief Memory binding flags.
*
* These flags can be used to refine the binding policy. All flags
* can be logically OR'ed together with the exception of
* HWLOC_MEMBIND_PROCESS and HWLOC_MEMBIND_THREAD; these two flags are
* mutually exclusive.
*
* \note Not all systems support all kinds of binding. See the
* "Detailed Description" section of \ref hwlocality_membinding for a
* description of errors that can occur.
*/
typedef enum {
HWLOC_MEMBIND_PROCESS = (1<<0), /**< \brief Set policy for all
* threads of the specified
* (possibly multithreaded)
* process. This flag is
* mutually exclusive with
* HWLOC_MEMBIND_THREAD.
* \hideinitializer */
HWLOC_MEMBIND_THREAD = (1<<1), /**< \brief Set policy for a
* specific thread of the
* current process. This flag
* is mutually exclusive with
* HWLOC_MEMBIND_PROCESS.
* \hideinitializer */
HWLOC_MEMBIND_STRICT = (1<<2), /**< Request strict binding
* from the OS. The function
* will fail if the binding
* can not be guaranteed /
* completely enforced.
*
* This flag has slightly
* different meanings
* depending on which function
* it is used with.
* \hideinitializer */
HWLOC_MEMBIND_MIGRATE = (1<<3), /**< \brief Migrate existing
* allocated memory. If the
* memory cannot be migrated
* and the
* HWLOC_MEMBIND_STRICT flag
* is passed, an error will be
* returned.
* \hideinitializer */
HWLOC_MEMBIND_NOCPUBIND = (1<<4) /**< \brief Avoid any effect
* on CPU binding.
*
* On some operating systems,
* some underlying memory
* binding functions also bind
* the application to the
* corresponding CPU(s).
* Using this flag will cause
* hwloc to avoid using OS
* functions that could
* potentially affect CPU
* bindings. Note, however,
* that using NOCPUBIND may
* reduce hwloc's overall
* memory binding support.
* Specifically: some of
* hwloc's memory binding
* functions may fail with
* errno set to ENOSYS when
* used with NOCPUBIND.
* \hideinitializer
*/
} hwloc_membind_flags_t;
/** \brief Set the default memory binding policy of the current
* process or thread to prefer the NUMA node(s) specified by \p nodeset
*
* If neither HWLOC_MEMBIND_PROCESS nor HWLOC_MEMBIND_THREAD is
* specified, the current process is assumed to be single-threaded.
* This is the most portable form as it permits hwloc to use either
* process-based OS functions or thread-based OS functions, depending
* on which are available.
*
* \return -1 with errno set to ENOSYS if the action is not supported
* \return -1 with errno set to EXDEV if the binding cannot be enforced
*/
HWLOC_DECLSPEC int hwloc_set_membind_nodeset(hwloc_topology_t topology, hwloc_const_nodeset_t nodeset, hwloc_membind_policy_t policy, int flags);
/** \brief Set the default memory binding policy of the current
* process or thread to prefer the NUMA node(s) near the specified \p
* cpuset
*
* If neither HWLOC_MEMBIND_PROCESS nor HWLOC_MEMBIND_THREAD is
* specified, the current process is assumed to be single-threaded.
* This is the most portable form as it permits hwloc to use either
* process-based OS functions or thread-based OS functions, depending
* on which are available.
*
* \return -1 with errno set to ENOSYS if the action is not supported
* \return -1 with errno set to EXDEV if the binding cannot be enforced
*/
HWLOC_DECLSPEC int hwloc_set_membind(hwloc_topology_t topology, hwloc_const_cpuset_t cpuset, hwloc_membind_policy_t policy, int flags);
/** \brief Query the default memory binding policy and locality of the
* current process or thread.
*
* This function has two output parameters: \p nodeset and \p policy.
* The values returned in these parameters depend on both the \p flags
* passed in and the current memory binding policies and nodesets in
* the queried target.
*
* Passing the HWLOC_MEMBIND_PROCESS flag specifies that the query
* target is the current policies and nodesets for all the threads in
* the current process. Passing HWLOC_MEMBIND_THREAD specifies that
* the query target is the current policy and nodeset for only the
* thread invoking this function.
*
* If neither of these flags are passed (which is the most portable
* method), the process is assumed to be single threaded. This allows
* hwloc to use either process-based OS functions or thread-based OS
* functions, depending on which are available.
*
* HWLOC_MEMBIND_STRICT is only meaningful when HWLOC_MEMBIND_PROCESS
* is also specified. In this case, hwloc will check the default
* memory policies and nodesets for all threads in the process. If
* they are not identical, -1 is returned and errno is set to EXDEV.
* If they are identical, the values are returned in \p nodeset and \p
* policy.
*
* Otherwise, if HWLOC_MEMBIND_PROCESS is specified (and
* HWLOC_MEMBIND_STRICT is \em not specified), \p nodeset is set to
* the logical OR of all threads' default nodeset. If all threads'
* default policies are the same, \p policy is set to that policy. If
* they are different, \p policy is set to HWLOC_MEMBIND_MIXED.
*
* In the HWLOC_MEMBIND_THREAD case (or when neither
* HWLOC_MEMBIND_PROCESS or HWLOC_MEMBIND_THREAD is specified), there
* is only one nodeset and policy; they are returned in \p nodeset and
* \p policy, respectively.
*
* If any other flags are specified, -1 is returned and errno is set
* to EINVAL.
*/
HWLOC_DECLSPEC int hwloc_get_membind_nodeset(hwloc_topology_t topology, hwloc_nodeset_t nodeset, hwloc_membind_policy_t * policy, int flags);
/** \brief Query the default memory binding policy and locality of the
* current process or thread (the locality is returned in \p cpuset as
* CPUs near the locality's actual NUMA node(s)).
*
* This function has two output parameters: \p cpuset and \p policy.
* The values returned in these parameters depend on both the \p flags
* passed in and the current memory binding policies and nodesets in
* the queried target.
*
* Passing the HWLOC_MEMBIND_PROCESS flag specifies that the query
* target is the current policies and nodesets for all the threads in
* the current process. Passing HWLOC_MEMBIND_THREAD specifies that
* the query target is the current policy and nodeset for only the
* thread invoking this function.
*
* If neither of these flags are passed (which is the most portable
* method), the process is assumed to be single threaded. This allows
* hwloc to use either process-based OS functions or thread-based OS
* functions, depending on which are available.
*
* HWLOC_MEMBIND_STRICT is only meaningful when HWLOC_MEMBIND_PROCESS
* is also specified. In this case, hwloc will check the default
* memory policies and nodesets for all threads in the process. If
* they are not identical, -1 is returned and errno is set to EXDEV.
* If they are identical, the policy is returned in \p policy. \p
* cpuset is set to the union of CPUs near the NUMA node(s) in the
* nodeset.
*
* Otherwise, if HWLOC_MEMBIND_PROCESS is specified (and
* HWLOC_MEMBIND_STRICT is \em not specified), the default nodeset
* from each thread is logically OR'ed together. \p cpuset is set to
* the union of CPUs near the NUMA node(s) in the resulting nodeset.
* If all threads' default policies are the same, \p policy is set to
* that policy. If they are different, \p policy is set to
* HWLOC_MEMBIND_MIXED.
*
* In the HWLOC_MEMBIND_THREAD case (or when neither
* HWLOC_MEMBIND_PROCESS or HWLOC_MEMBIND_THREAD is specified), there
* is only one nodeset and policy. The policy is returned in \p
* policy; \p cpuset is set to the union of CPUs near the NUMA node(s)
* in the \p nodeset.
*
* If any other flags are specified, -1 is returned and errno is set
* to EINVAL.
*/
HWLOC_DECLSPEC int hwloc_get_membind(hwloc_topology_t topology, hwloc_cpuset_t cpuset, hwloc_membind_policy_t * policy, int flags);
/** \brief Set the default memory binding policy of the specified
* process to prefer the NUMA node(s) specified by \p nodeset
*
* \return -1 with errno set to ENOSYS if the action is not supported
* \return -1 with errno set to EXDEV if the binding cannot be enforced
*/
HWLOC_DECLSPEC int hwloc_set_proc_membind_nodeset(hwloc_topology_t topology, hwloc_pid_t pid, hwloc_const_nodeset_t nodeset, hwloc_membind_policy_t policy, int flags);
/** \brief Set the default memory binding policy of the specified
* process to prefer the NUMA node(s) near the specified \p cpuset
*
* \return -1 with errno set to ENOSYS if the action is not supported
* \return -1 with errno set to EXDEV if the binding cannot be enforced
*/
HWLOC_DECLSPEC int hwloc_set_proc_membind(hwloc_topology_t topology, hwloc_pid_t pid, hwloc_const_cpuset_t cpuset, hwloc_membind_policy_t policy, int flags);
/** \brief Query the default memory binding policy and locality of the
* specified process.
*
* This function has two output parameters: \p nodeset and \p policy.
* The values returned in these parameters depend on both the \p flags
* passed in and the current memory binding policies and nodesets in
* the queried target.
*
* Passing the HWLOC_MEMBIND_PROCESS flag specifies that the query
* target is the current policies and nodesets for all the threads in
* the specified process. If HWLOC_MEMBIND_PROCESS is not specified
* (which is the most portable method), the process is assumed to be
* single threaded. This allows hwloc to use either process-based OS
* functions or thread-based OS functions, depending on which are
* available.
*
* Note that it does not make sense to pass HWLOC_MEMBIND_THREAD to
* this function.
*
* If HWLOC_MEMBIND_STRICT is specified, hwloc will check the default
* memory policies and nodesets for all threads in the specified
* process. If they are not identical, -1 is returned and errno is
* set to EXDEV. If they are identical, the values are returned in \p
* nodeset and \p policy.
*
* Otherwise, \p nodeset is set to the logical OR of all threads'
* default nodeset. If all threads' default policies are the same, \p
* policy is set to that policy. If they are different, \p policy is
* set to HWLOC_MEMBIND_MIXED.
*
* If any other flags are specified, -1 is returned and errno is set
* to EINVAL.
*/
HWLOC_DECLSPEC int hwloc_get_proc_membind_nodeset(hwloc_topology_t topology, hwloc_pid_t pid, hwloc_nodeset_t nodeset, hwloc_membind_policy_t * policy, int flags);
/** \brief Query the default memory binding policy and locality of the
* specified process (the locality is returned in \p cpuset as CPUs
* near the locality's actual NUMA node(s)).
*
* This function has two output parameters: \p cpuset and \p policy.
* The values returned in these parameters depend on both the \p flags
* passed in and the current memory binding policies and nodesets in
* the queried target.
*
* Passing the HWLOC_MEMBIND_PROCESS flag specifies that the query
* target is the current policies and nodesets for all the threads in
* the specified process. If HWLOC_MEMBIND_PROCESS is not specified
* (which is the most portable method), the process is assumed to be
* single threaded. This allows hwloc to use either process-based OS
* functions or thread-based OS functions, depending on which are
* available.
*
* Note that it does not make sense to pass HWLOC_MEMBIND_THREAD to
* this function.
*
* If HWLOC_MEMBIND_STRICT is specified, hwloc will check the default
* memory policies and nodesets for all threads in the specified
* process. If they are not identical, -1 is returned and errno is
* set to EXDEV. If they are identical, the policy is returned in \p
* policy. \p cpuset is set to the union of CPUs near the NUMA
* node(s) in the nodeset.
*
* Otherwise, the default nodeset from each thread is logically OR'ed
* together. \p cpuset is set to the union of CPUs near the NUMA
* node(s) in the resulting nodeset. If all threads' default policies
* are the same, \p policy is set to that policy. If they are
* different, \p policy is set to HWLOC_MEMBIND_MIXED.
*
* If any other flags are specified, -1 is returned and errno is set
* to EINVAL.
*/
HWLOC_DECLSPEC int hwloc_get_proc_membind(hwloc_topology_t topology, hwloc_pid_t pid, hwloc_cpuset_t cpuset, hwloc_membind_policy_t * policy, int flags);
/** \brief Bind the already-allocated memory identified by (addr, len)
* to the NUMA node(s) in \p nodeset.
*
* \return -1 with errno set to ENOSYS if the action is not supported
* \return -1 with errno set to EXDEV if the binding cannot be enforced
*/
HWLOC_DECLSPEC int hwloc_set_area_membind_nodeset(hwloc_topology_t topology, const void *addr, size_t len, hwloc_const_nodeset_t nodeset, hwloc_membind_policy_t policy, int flags);
/** \brief Bind the already-allocated memory identified by (addr, len)
* to the NUMA node(s) near \p cpuset.
*
* \return -1 with errno set to ENOSYS if the action is not supported
* \return -1 with errno set to EXDEV if the binding cannot be enforced
*/
HWLOC_DECLSPEC int hwloc_set_area_membind(hwloc_topology_t topology, const void *addr, size_t len, hwloc_const_cpuset_t cpuset, hwloc_membind_policy_t policy, int flags);
/** \brief Query the NUMA node(s) and binding policy of the memory
* identified by (\p addr, \p len ).
*
* This function has two output parameters: \p nodeset and \p policy.
* The values returned in these parameters depend on both the \p flags
* passed in and the memory binding policies and nodesets of the pages
* in the address range.
*
* If HWLOC_MEMBIND_STRICT is specified, the target pages are first
* checked to see if they all have the same memory binding policy and
* nodeset. If they do not, -1 is returned and errno is set to EXDEV.
* If they are identical across all pages, the nodeset and policy are
* returned in \p nodeset and \p policy, respectively.
*
* If HWLOC_MEMBIND_STRICT is not specified, \p nodeset is set to the
* union of all NUMA node(s) containing pages in the address range.
* If all pages in the target have the same policy, it is returned in
* \p policy. Otherwise, \p policy is set to HWLOC_MEMBIND_MIXED.
*
* If any other flags are specified, -1 is returned and errno is set
* to EINVAL.
*/
HWLOC_DECLSPEC int hwloc_get_area_membind_nodeset(hwloc_topology_t topology, const void *addr, size_t len, hwloc_nodeset_t nodeset, hwloc_membind_policy_t * policy, int flags);
/** \brief Query the CPUs near the NUMA node(s) and binding policy of
* the memory identified by (\p addr, \p len ).
*
* This function has two output parameters: \p cpuset and \p policy.
* The values returned in these parameters depend on both the \p flags
* passed in and the memory binding policies and nodesets of the pages
* in the address range.
*
* If HWLOC_MEMBIND_STRICT is specified, the target pages are first
* checked to see if they all have the same memory binding policy and
* nodeset. If they do not, -1 is returned and errno is set to EXDEV.
* If they are identical across all pages, the policy is returned in
* \p policy. \p cpuset is set to the union of CPUs near the NUMA
* node(s) in the nodeset.
*
* If HWLOC_MEMBIND_STRICT is not specified, the union of all NUMA
* node(s) containing pages in the address range is calculated. \p
* cpuset is then set to the CPUs near the NUMA node(s) in this union.
* If all pages in the target have the same policy, it is returned in
* \p policy. Otherwise, \p policy is set to HWLOC_MEMBIND_MIXED.
*
* If any other flags are specified, -1 is returned and errno is set
* to EINVAL.
*/
HWLOC_DECLSPEC int hwloc_get_area_membind(hwloc_topology_t topology, const void *addr, size_t len, hwloc_cpuset_t cpuset, hwloc_membind_policy_t * policy, int flags);
/** \brief Allocate some memory
*
* This is equivalent to malloc(), except that it tries to allocate
* page-aligned memory from the OS.
*
* \note The allocated memory should be freed with hwloc_free().
*/
HWLOC_DECLSPEC void *hwloc_alloc(hwloc_topology_t topology, size_t len);
/** \brief Allocate some memory on the given nodeset \p nodeset
*
* \return -1 with errno set to ENOSYS if the action is not supported
* and HWLOC_MEMBIND_STRICT is given
* \return -1 with errno set to EXDEV if the binding cannot be enforced
* and HWLOC_MEMBIND_STRICT is given
*
* \note The allocated memory should be freed with hwloc_free().
*/
HWLOC_DECLSPEC void *hwloc_alloc_membind_nodeset(hwloc_topology_t topology, size_t len, hwloc_const_nodeset_t nodeset, hwloc_membind_policy_t policy, int flags) __hwloc_attribute_malloc;
/** \brief Allocate some memory on memory nodes near the given cpuset \p cpuset
*
* \return -1 with errno set to ENOSYS if the action is not supported
* and HWLOC_MEMBIND_STRICT is given
* \return -1 with errno set to EXDEV if the binding cannot be enforced
* and HWLOC_MEMBIND_STRICT is given
*
* \note The allocated memory should be freed with hwloc_free().
*/
HWLOC_DECLSPEC void *hwloc_alloc_membind(hwloc_topology_t topology, size_t len, hwloc_const_cpuset_t cpuset, hwloc_membind_policy_t policy, int flags) __hwloc_attribute_malloc;
/** \brief Free memory that was previously allocated by hwloc_alloc()
* or hwloc_alloc_membind().
*/
HWLOC_DECLSPEC int hwloc_free(hwloc_topology_t topology, void *addr, size_t len);
/** @} */
#ifdef __cplusplus
} /* extern "C" */
#endif
/* high-level helpers */
#include <hwloc/helper.h>
#endif /* HWLOC_H */
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