|||
在many-core程序的设计中,往往需要获取cpu核的数量,觉得这段代码很好,摘录下来:
摘自:http://stackoverflow.com/questions/150355/programmatically-find-the-number-of-cores-on-a-machine
#ifdef _WIN32
#include <windows.h>
#elif MACOS
#include <sys/param.h>
#include <sys/sysctl.h>
#else
#include <unistd.h>
#endif
int getNumCores() {
#ifdef WIN32
SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
return sysinfo.dwNumberOfProcessors;
#elif MACOS
int nm[2];
size_t len = 4;
uint32_t count;
nm[0] = CTL_HW; nm[1] = HW_AVAILCPU;
sysctl(nm, 2, &count, &len, NULL, 0);
if(count < 1) {
nm[1] = HW_NCPU;
sysctl(nm, 2, &count, &len, NULL, 0);
if(count < 1) { count = 1; }
}
return count;
#else
return sysconf(_SC_NPROCESSORS_ONLN);
#endif
}
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