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File Name : gpu.c

/* This example program plays with:
 * - finding GPU OS devices
 * - getting CUDA and OpenCL attributes
 * - displaying the locality of the GPU
 *
 * Copyright © 2009-2019 Inria.  All rights reserved.
 * Copyright © 2009-2011,2017 Université Bordeaux
 * Copyright © 2009-2010 Cisco Systems, Inc.  All rights reserved.
 * See COPYING in top-level directory.
 */

#include "hwloc.h"

#include <errno.h>
#include <stdio.h>
#include <string.h>

int main(void)
{
    hwloc_topology_t topology;
    hwloc_obj_t obj;
    unsigned n, i;
    int devid, platformid;
    const char *dev;

/* Allocate, initialize and load topology object. */
    hwloc_topology_init(&topology);
    hwloc_topology_set_io_types_filter(topology, HWLOC_TYPE_FILTER_KEEP_IMPORTANT);
    hwloc_topology_load(topology);

/* Find CUDA devices through the corresponding OS devices */
    n = hwloc_get_nbobjs_by_type(topology, HWLOC_OBJ_OS_DEVICE);

for (i = 0; i < n ; i++) {
      const char *s;
      obj = hwloc_get_obj_by_type(topology, HWLOC_OBJ_OS_DEVICE, i);
      printf("%s:\n", obj->name);

/* obj->attr->osdev.type is HWLOC_OBJ_OSDEV_COPROC */

s = hwloc_obj_get_info_by_name(obj, "Backend");
      /* obj->subtype also contains CUDA or OpenCL since v2.0 */

if (s && !strcmp(s, "CUDA")) {
        /* This is a CUDA device */
        assert(!strncmp(obj->name, "cuda", 4));
        devid = atoi(obj->name + 4);
        printf("CUDA device %d\n", devid);

s = hwloc_obj_get_info_by_name(obj, "GPUModel");
        if (s)
          printf("Model: %s\n", s);

s = hwloc_obj_get_info_by_name(obj, "CUDAGlobalMemorySize");
        if (s)
          printf("Memory: %s\n", s);

s = hwloc_obj_get_info_by_name(obj, "CUDAMultiProcessors");
        if (s)
        {
          int mp = atoi(s);
          s = hwloc_obj_get_info_by_name(obj, "CUDACoresPerMP");
          if (s) {
            int mp_cores = atoi(s);
            printf("Cores: %d\n", mp * mp_cores);
          }
        }
      }

if (s && !strcmp(s, "OpenCL")) {
        /* This is an OpenCL device */
        assert(!strncmp(obj->name, "opencl", 6));
        platformid = atoi(obj->name + 6);
        printf("OpenCL platform %d\n", platformid);
        dev = strchr(obj->name + 6, 'd');
        devid = atoi(dev + 1);
        printf("OpenCL device %d\n", devid);

s = hwloc_obj_get_info_by_name(obj, "GPUModel");
        if (s)
          printf("Model: %s\n", s);

s = hwloc_obj_get_info_by_name(obj, "OpenCLGlobalMemorySize");
        if (s)
          printf("Memory: %s\n", s);
      }

/* One can also use helpers from hwloc/cuda.h, hwloc/cudart.h,
       * hwloc/opencl.h */

/* Find out cpuset this is connected to */
      while (obj && (!obj->cpuset || hwloc_bitmap_iszero(obj->cpuset)))
        obj = obj->parent;

if (obj) {
        char *cpuset_string;
        char name[16];
        hwloc_obj_type_snprintf(name, sizeof(name), obj, 0);
        hwloc_bitmap_asprintf(&cpuset_string, obj->cpuset);
        printf("Location: %s P#%u\n", name, obj->os_index);
        printf("Cpuset: %s\n", cpuset_string);
      }
      printf("\n");
    }

/* Destroy topology object. */
    hwloc_topology_destroy(topology);

return 0;
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-12-30 10:12:58
..	dir	-	root/root	0755	2025-12-30 10:12:58
Makefile.am	file	832 B	root/root	0644	2020-11-23 02:37:17
Makefile.in	file	42.26 KB	root/root	0644	2021-02-11 08:47:52
Makefile_x86_64	file	41.25 KB	root/root	0644	2025-12-22 08:14:48
cpuset+bitmap+cpubind.c	file	5.13 KB	root/root	0644	2020-11-23 02:37:17
get-knl-modes.c	file	908 B	root/root	0644	2020-11-23 02:37:17
gpu.c	file	3.19 KB	root/root	0644	2020-11-23 02:37:17
hwloc-hello-cpp.cpp	file	5.92 KB	root/root	0644	2020-11-23 02:38:34
hwloc-hello.c	file	5.92 KB	root/root	0644	2020-11-23 02:37:17
nodeset+membind+policy.c	file	4.9 KB	root/root	0644	2020-11-23 02:37:17
sharedcaches.c	file	2.77 KB	root/root	0644	2020-11-23 02:37:17

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