flywithu/ntel-gpu-tools
1
0
Fork 0
mirror of https://github.com/tiagovignatti/intel-gpu-tools.git synced 2025-06-21 06:46:13 +00:00
Code Issues Releases Wiki Activity

benchmarks/gem_syslatency: Measure unloaded latency

Browse Source 
Also useful to know how much worse than baseline the latency is when the
gem load is applied. For slower systems, presenting in nanoseconds makes
it hard to read, so switch to microseconds for output.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2016-03-10 08:40:06 +00:00
parent 6cd15fb930
commit c084c2b88b
1 changed files with 23 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
benchmarks/gem_syslatency.c
View File

@ -147,7 +147,7 @@ static void *gem_busyspin(void *arg)
static double elapsed(const struct timespec *a, const struct timespec *b)
{
return NSEC_PER_SEC*(b->tv_sec - a->tv_sec) + (b->tv_nsec - a ->tv_nsec);
return 1e9*(b->tv_sec - a->tv_sec) + (b->tv_nsec - a ->tv_nsec);
}
static void *sys_wait(void *arg)
@ -225,10 +225,14 @@ int main(int argc, char **argv)
igt_stats_t cycles, mean, max;
int time = 10;
int field = -1;
int enable_gem_sysbusy = 1;
int n, c;
while ((c = getopt(argc, argv, "t:f:")) != -1) {
while ((c = getopt(argc, argv, "t:f:n")) != -1) {
switch (c) {
case 'n': /* dry run, measure baseline system latency */
enable_gem_sysbusy = 0;
break;
case 't':
/* How long to run the benchmark for (seconds) */
time = atoi(optarg);
@ -246,13 +250,15 @@ int main(int argc, char **argv)
}
busy = calloc(ncpus, sizeof(*busy));
wait = calloc(ncpus, sizeof(*wait));
for (n = 0; n < ncpus; n++) {
busy[n].cpu = n;
pthread_create(&busy[n].thread, NULL, gem_busyspin, &busy[n]);
if (enable_gem_sysbusy) {
for (n = 0; n < ncpus; n++) {
busy[n].cpu = n;
pthread_create(&busy[n].thread, NULL,
gem_busyspin, &busy[n]);
}
}
wait = calloc(ncpus, sizeof(*wait));
pthread_attr_init(&attr);
rtprio(&attr, 99);
for (n = 0; n < ncpus; n++) {
@ -265,9 +271,11 @@ int main(int argc, char **argv)
done = 1;
igt_stats_init_with_size(&cycles, ncpus);
for (n = 0; n < ncpus; n++) {
pthread_join(busy[n].thread, NULL);
igt_stats_push(&cycles, busy[n].count);
if (enable_gem_sysbusy) {
for (n = 0; n < ncpus; n++) {
pthread_join(busy[n].thread, NULL);
igt_stats_push(&cycles, busy[n].count);
}
}
igt_stats_init_with_size(&mean, ncpus);
@ -280,19 +288,19 @@ int main(int argc, char **argv)
switch (field) {
default:
printf("gem_syslatency: cycles=%.0f, latency mean=%.3fns max=%.0fns\n",
printf("gem_syslatency: cycles=%.0f, latency mean=%.3fus max=%.0fus\n",
igt_stats_get_mean(&cycles),
igt_stats_get_mean(&mean),
l_estimate(&max));
igt_stats_get_mean(&mean) / 1000,
l_estimate(&max) / 1000);
break;
case 0:
printf("%.0f\n", igt_stats_get_mean(&cycles));
break;
case 1:
printf("%.3f\n", igt_stats_get_mean(&mean));
printf("%.3f\n", igt_stats_get_mean(&mean) / 1000);
break;
case 2:
printf("%.0f\n", l_estimate(&max));
printf("%.0f\n", l_estimate(&max) / 1000);
break;
}