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Portable Hardware Locality (hwloc) Documentation: v1.3.2

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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   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 */