linux 性能测试

#include <sys/time.h>

int   tim_subtract(struct timeval *result, struct timeval *x, struct timeval *y)
{

if ( x->tv_sec > y->tv_sec )
return   -1;

if ((x->tv_sec==y->tv_sec) && (x->tv_usec>y->tv_usec))
return   -1;


result->tv_sec = ( y->tv_sec-x->tv_sec );

result->tv_usec = ( y->tv_usec-x->tv_usec );


if (result->tv_usec<0){


result->tv_sec--;


result->tv_usec+=1000000;


}


return   0;

}

void main( )

{
struct   timeval   start,stop,diff;
gettimeofday(&start,0);


// your app run
       
// test
gettimeofday(&stop,0);
tim_subtract(&diff,&start,&stop);
printf("总计用时:%d毫秒\n",diff.tv_usec/1000);
}