sys.cpp

#include <sys/resource.h>
#include <sys/time.h>
#include "htab.h"

int yak_verbose = 3;

static double yak_realtime0;

double yak_cputime(void)
{
	struct rusage r;
	getrusage(RUSAGE_SELF, &r);
	return r.ru_utime.tv_sec + r.ru_stime.tv_sec + 1e-6 * (r.ru_utime.tv_usec + r.ru_stime.tv_usec);
}

static inline double yak_realtime_core(void)
{
	struct timeval tp;
	struct timezone tzp;
	gettimeofday(&tp, &tzp);
	return tp.tv_sec + tp.tv_usec * 1e-6;
}

void yak_reset_realtime(void)
{
	yak_realtime0 = yak_realtime_core();
}

double yak_realtime(void)
{
	return yak_realtime_core() - yak_realtime0;
}

double yak_realtime_0(void)
{
	return yak_realtime_core();
}


long yak_peakrss(void)
{
	struct rusage r;
	getrusage(RUSAGE_SELF, &r);
#ifdef __linux__
	return r.ru_maxrss * 1024;
#else
	return r.ru_maxrss;
#endif
}

double yak_peakrss_in_gb(void)
{
	return yak_peakrss() / 1073741824.0;
}

double yak_cpu_usage(void)
{
	return (yak_cputime() + 1e-9) / (yak_realtime() + 1e-9);
}