htop/hwloc-1.2.1/include/hwloc/cudart.h

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/*
* Copyright © 2010 INRIA. All rights reserved.
* Copyright © 2010 Université Bordeaux 1
* Copyright © 2011 Cisco Systems, Inc. All rights reserved.
* See COPYING in top-level directory.
*/
/** \file
* \brief Macros to help interaction between hwloc and the CUDA Runtime API.
*
* Applications that use both hwloc and the CUDA Runtime API may want to
* include this file so as to get topology information for CUDA devices.
*
*/
#ifndef HWLOC_CUDART_H
#define HWLOC_CUDART_H
#include <hwloc.h>
#include <hwloc/autogen/config.h>
#include <hwloc/linux.h>
#include <cuda_runtime_api.h>
#ifdef __cplusplus
extern "C" {
#endif
/** \defgroup hwlocality_cudart CUDA Runtime API Specific Functions
* @{
*/
/** \brief Get the CPU set of logical processors that are physically
* close to device \p cudevice.
*
* For the given CUDA Runtime API device \p cudevice, read the corresponding
* kernel-provided cpumap file and return the corresponding CPU set.
* This function is currently only implemented in a meaningful way for
* Linux; other systems will simply get a full cpuset.
*/
static __hwloc_inline int
hwloc_cudart_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
int device, hwloc_cpuset_t set)
{
#ifdef HWLOC_LINUX_SYS
/* If we're on Linux, use the sysfs mechanism to get the local cpus */
#define HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX 128
cudaError_t cerr;
struct cudaDeviceProp prop;
char path[HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX];
FILE *sysfile = NULL;
cerr = cudaGetDeviceProperties(&prop, device);
if (cerr) {
errno = ENOSYS;
return -1;
}
sprintf(path, "/sys/bus/pci/devices/0000:%02x:%02x.0/local_cpus", prop.pciBusID, prop.pciDeviceID);
sysfile = fopen(path, "r");
if (!sysfile)
return -1;
hwloc_linux_parse_cpumap_file(sysfile, set);
fclose(sysfile);
#else
/* Non-Linux systems simply get a full cpuset */
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
#endif
return 0;
}
/** @} */
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* HWLOC_CUDART_H */