66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
unsigned long g_result;
|
|
|
|
static unsigned long long
|
|
cputime (void)
|
|
{
|
|
struct rusage rus;
|
|
getrusage (0, &rus);
|
|
return rus.ru_utime.tv_sec * 1000000ULL + rus.ru_utime.tv_usec;
|
|
}
|
|
|
|
static unsigned int randValue = 0;
|
|
static void rand_init(void)
|
|
{
|
|
randValue = 0;
|
|
}
|
|
static unsigned int rand_get(void)
|
|
{
|
|
randValue = randValue * 31421U + 6927U;
|
|
return randValue;
|
|
}
|
|
|
|
static void test_function(const char str[], size_t n, void (*func)(size_t))
|
|
{
|
|
unsigned long long start, end;
|
|
rand_init();
|
|
start = cputime();
|
|
(*func)(n);
|
|
end = cputime();
|
|
end = (end - start) / 1000U;
|
|
printf ("%s %Lu ms for n = %lu [r=%lu]\n", str, end, n, g_result);
|
|
}
|
|
|
|
#if defined(_WIN32)
|
|
# include <windows.h>
|
|
#elif (defined(__APPLE__) && defined(__MACH__)) \
|
|
|| defined(__DragonFly__) || defined(__FreeBSD__) \
|
|
|| defined(__NetBSD__) || defined(__OpenBSD__)
|
|
# include <sys/param.h>
|
|
# include <sys/sysctl.h>
|
|
# define USE_SYSCTL
|
|
#else
|
|
# include <unistd.h>
|
|
#endif
|
|
|
|
/* Return the number of CPU of the system */
|
|
static inline int get_cpu_count(void)
|
|
{
|
|
#if defined(_WIN32)
|
|
SYSTEM_INFO sysinfo;
|
|
GetSystemInfo(&sysinfo);
|
|
return sysinfo.dwNumberOfProcessors;
|
|
#elif defined(USE_SYSCTL)
|
|
int nm[2];
|
|
int count = 0;
|
|
size_t len = sizeof (count);
|
|
nm[0] = CTL_HW;
|
|
nm[1] = HW_NCPU;
|
|
sysctl(nm, 2, &count, &len, NULL, 0);
|
|
return MAX(1, count);
|
|
#elif defined (_SC_NPROCESSORS_ONLN)
|
|
return sysconf(_SC_NPROCESSORS_ONLN);
|
|
#else
|
|
return 1;
|
|
#endif
|
|
}
|