On 2008-01-08 19:15Z, Norton Allen wrote:
>
> Now, I am definitely interested in wall clock elapsed time. Is there
> anything available that will give me real time at resolution greater
> than one second?
/tmp[0]$cat clock_test.c
#include <time.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/time.h> // gettimeofday()
int main( int argc, char **argv ) {
clock_t cur_time, cps = CLOCKS_PER_SEC;
int i;
struct timeval x;
printf( "CLOCKS_PER_SEC = %ld\n", cps );
for ( i = 0; i < 8; i++ ) {
sleep(1);
cur_time = clock();
printf( "clock() = %ld\n", cur_time );
gettimeofday(&x, 0);
printf( "gettimeofday() = %ld\n", 1000000 * x.tv_sec + x.tv_usec );
}
return 0;
}
/tmp[0]$gcc -o clock_test.exe clock_test.c
/tmp[0]$./clock_test
CLOCKS_PER_SEC = 1000
clock() = 30
gettimeofday() = 210033718
clock() = 30
gettimeofday() = 211033718
clock() = 30
gettimeofday() = 212033718
clock() = 30
gettimeofday() = 213033718
clock() = 30
gettimeofday() = 214033718
clock() = 30
gettimeofday() = 215033718
clock() = 30
gettimeofday() = 216033718
clock() = 30
gettimeofday() = 217033718
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