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igt/gem_exec_blt: Repeat measurement and average

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Through away the unstable outliers for a more consistent measurement.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2015-03-20 22:37:00 +00:00
parent cd8d3809a6
commit c666a19e0c
1 changed files with 29 additions and 8 deletions
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37
tests/gem_exec_blt.c
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@ -189,6 +189,17 @@ static uint32_t dumb_create(int fd)
return arg.handle; return arg.handle;
} }
static int dcmp(const void *A, const void *B)
{
const double *a = A, *b = B;
if (*a < *b)
return -1;
else if (*a > *b)
return 1;
else
return 0;
}
static void run(int object_size, bool dumb) static void run(int object_size, bool dumb)
{ {
struct drm_i915_gem_execbuffer2 execbuf; struct drm_i915_gem_execbuffer2 execbuf;
@ -245,16 +256,26 @@ static void run(int object_size, bool dumb)
for (count = 1; count <= 1<<12; count <<= 1) { for (count = 1; count <= 1<<12; count <<= 1) {
struct timeval start, end; struct timeval start, end;
const int reps = 9;
double t[reps], sum;
int n;
gettimeofday(&start, NULL); for (n = 0; n < reps; n++) {
for (int loop = 0; loop < count; loop++) gettimeofday(&start, NULL);
gem_execbuf(fd, &execbuf); for (int loop = 0; loop < count; loop++)
gem_sync(fd, handle); gem_execbuf(fd, &execbuf);
gettimeofday(&end, NULL); gem_sync(fd, handle);
gettimeofday(&end, NULL);
t[n] = elapsed(&start, &end, count);
}
qsort(t, n, sizeof(double), dcmp);
sum = 0;
for (n = 2; n < reps - 2; n++)
sum += t[n];
sum /= reps - 4;
igt_info("Time to blt %d bytes x %6d: %7.3fµs, %s\n", igt_info("Time to blt %d bytes x %6d: %7.3fµs, %s\n",
object_size, count, object_size, count, sum,
elapsed(&start, &end, count), bytes_per_sec((char *)buf, object_size/sum*1e6));
bytes_per_sec((char *)buf, object_size/elapsed(&start, &end, count)*1e6));
fflush(stdout); fflush(stdout);
} }
gem_close(fd, handle); gem_close(fd, handle);