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   int pciDomainID = 0;
    00055
    00056   cerr = cudaGetDeviceProperties(&prop, device);
    00057   if (cerr) {
    00058     errno = ENOSYS;
    00059     return -1;
    00060   }
    00061
    00062 #if CUDART_VERSION >= 4000
    00063   pciDomainID = prop.pciDomainID;
    00064 #endif
    00065
    00066   sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", pciDomainID, prop.pciBusID, prop.pciDeviceID);
    00067   sysfile = fopen(path, "r");
    00068   if (!sysfile)
    00069     return -1;
    00070
    00071   hwloc_linux_parse_cpumap_file(sysfile, set);
    00072
    00073   fclose(sysfile);
    00074 #else
    00075   /* Non-Linux systems simply get a full cpuset */
    00076   hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
    00077 #endif
    00078   return 0;
    00079 }
    00080
    00084 #ifdef __cplusplus
    00085 } /* extern "C" */
    00086 #endif
    00087
    00088
    00089 #endif /* HWLOC_CUDART_H */