Hardware Locality (hwloc): cudart.h Source File

Hardware Locality (hwloc) 1.2.2

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cudart.h

    00001 /*
    00002  * Copyright © 2010 INRIA.  All rights reserved.
    00003  * Copyright © 2010 Université Bordeaux 1
    00004  * Copyright © 2011 Cisco Systems, Inc.  All rights reserved.
    00005  * See COPYING in top-level directory.
    00006  */
    00007
    00016 #ifndef HWLOC_CUDART_H
    00017 #define HWLOC_CUDART_H
    00018
    00019 #include <hwloc.h>
    00020 #include <hwloc/autogen/config.h>
    00021 #include <hwloc/linux.h>
    00022
    00023 #include <cuda_runtime_api.h>
    00024
    00025
    00026 #ifdef __cplusplus
    00027 extern "C" {
    00028 #endif
    00029
    00030
    00043 static inline int
    00044 hwloc_cudart_get_device_cpuset(hwloc_topology_t topology ,
    00045                                int device, hwloc_cpuset_t set)
    00046 {
    00047 #ifdef HWLOC_LINUX_SYS
    00048   /* If we're on Linux, use the sysfs mechanism to get the local cpus */
    00049 #define HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX 128
    00050   cudaError_t cerr;
    00051   struct cudaDeviceProp prop;
    00052   char path[HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX];
    00053   FILE *sysfile = NULL;
    00054
    00055   cerr = cudaGetDeviceProperties(&prop, device);
    00056   if (cerr) {
    00057     errno = ENOSYS;
    00058     return -1;
    00059   }
    00060
    00061   sprintf(path, "/sys/bus/pci/devices/0000:%02x:%02x.0/local_cpus", prop.pciBusID, prop.pciDeviceID);
    00062   sysfile = fopen(path, "r");
    00063   if (!sysfile)
    00064     return -1;
    00065
    00066   hwloc_linux_parse_cpumap_file(sysfile, set);
    00067
    00068   fclose(sysfile);
    00069 #else
    00070   /* Non-Linux systems simply get a full cpuset */
    00071   hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
    00072 #endif
    00073   return 0;
    00074 }
    00075
    00079 #ifdef __cplusplus
    00080 } /* extern "C" */
    00081 #endif
    00082
    00083
    00084 #endif /* HWLOC_CUDART_H */