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[Unix] Simple Time Measure Routine

2007-04-22 15:07:42| 分类： unix | 标签： |举报 |字号大中小订阅

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UNIX 下简单的时间计算方法，可用于检测自己程序运行时间的消耗。。

Prototypes

#ifndef MY_TIME_H
#define MY_TIME_H

/*
 * Measure util for timing
 */

void tstart(void);
void tend(void);
double tval(void);

#endif /* MY_TIME_H */

Implementation

#include <sys/time.h>

static struct timeval _tstart, _tend;
static struct timezone tz;

void tstart(void)
{
 gettimeofday(&_tstart, &tz);
}

void tend(void)
{
 gettimeofday(&_tend, &tz);
}

double tval(void)
{
 double t1, t2;

 t1 = (double)_tstart.tv_sec + (double)_tstart.tv_usec/(1000*1000);
 t2 = (double)_tend.tv_sec + (double)_tend.tv_usec/(1000*1000);

 return t2-t1;
}


#ifdef TEST_MAIN
int main(void)
{
 int i, j, val[1024];

 tstart();
 for ( j = 0; j < 10000; j++ )
 {
  for ( i = 0; i < 1024; i++ )
   val[i] = i;
 }
 tend();
 printf("cost = %f sec.\n", tval());

 return 0;
}
#endif

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