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benchmarks/fpu: improve timing precision to milliseconds

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Change FPU benchmark timing from seconds to milliseconds for better accuracy.
This allows for more precise measurement of test cycles, especially for
shorter test runs that previously completed within a single second.

Signed-off-by: makejian <makejian@xiaomi.com>
This commit is contained in:
makejian 2025-05-29 20:50:13 +08:00 • committed by Alan C. Assis
parent 9148fb9718
commit 22f85e8b61
1 changed files with 11 additions and 8 deletions
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19
benchmarks/whetstone/whetstone.c
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@ -143,10 +143,11 @@ int main(int argc, FAR char *argv[])
/* added for this version */ /* added for this version */
long loopstart; long loopstart;
long startsec; long startmsec;
long finisec; long finimsec;
float KIPS; float KIPS;
int continuous; int continuous;
struct timespec ts;
loopstart = 1000; /* see the note about loop below */ loopstart = 1000; /* see the note about loop below */
continuous = 0; continuous = 0;
@ -175,7 +176,8 @@ LCONT:
/* Start benchmark timing at this point. */ /* Start benchmark timing at this point. */
startsec = time(0); clock_gettime(CLOCK_REALTIME, &ts);
startmsec = ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
/* The actual benchmark starts here. */ /* The actual benchmark starts here. */
@ -431,7 +433,8 @@ IILOOP:
/* Stop benchmark timing at this point. */ /* Stop benchmark timing at this point. */
finisec = time(0); clock_gettime(CLOCK_REALTIME, &ts);
finimsec = ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
/* Performance in Whetstone KIP's per second is given by /* Performance in Whetstone KIP's per second is given by
* *
@ -441,16 +444,16 @@ IILOOP:
*/ */
printf("\n"); printf("\n");
if (finisec - startsec <= 0) if (finimsec - startmsec <= 0)
{ {
printf("Insufficient duration- Increase the loop count\n"); printf("Insufficient duration- Increase the loop count\n");
return 1; return 1;
} }
printf("Loops: %ld, Iterations: %d, Duration: %ld sec.\n", printf("Loops: %ld, Iterations: %d, Duration: %ld millisecond.\n",
loop, ii, finisec - startsec); loop, ii, finimsec - startmsec);
KIPS = (100.0 * loop * ii) / (float)(finisec - startsec); KIPS = (100.0 * loop * ii) / ((float)(finimsec - startmsec) * 1000);
if (KIPS >= 1000.0) if (KIPS >= 1000.0)
{ {
printf("C Converted Double Precision Whetstones: %.1f MIPS\n", printf("C Converted Double Precision Whetstones: %.1f MIPS\n",