Hardware Locality (hwloc) 1.3.1
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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 */