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benchmarks/gem_exec_nop: Convert to running for a fixed time

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Like the previous patch to gem_exec_ctx, retrict gem_exec_nop to running
for a fixed length of time, rather than over a range of different
execution counts. In order to retain some measurement of that range,
allow measuring individual execution versus continuous dispatch.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2016-01-02 15:19:27 +00:00
parent 6953899beb
commit 9b90234414
1 changed files with 31 additions and 27 deletions
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58
benchmarks/gem_exec_nop.c
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@ -47,11 +47,12 @@
#define LOCAL_I915_EXEC_NO_RELOC (1<<11)
#define LOCAL_I915_EXEC_HANDLE_LUT (1<<12)
static uint64_t elapsed(const struct timespec *start,
const struct timespec *end,
int loop)
#define SYNC 0x1
static double elapsed(const struct timespec *start,
const struct timespec *end)
{
return (1000000000ULL*(end->tv_sec - start->tv_sec) + (end->tv_nsec - start->tv_nsec))/loop;
return (end->tv_sec - start->tv_sec) + 1e-9*(end->tv_nsec - start->tv_nsec);
}
static int __gem_execbuf(int fd, struct drm_i915_gem_execbuffer2 *execbuf)
@ -70,11 +71,11 @@ static uint32_t batch(int fd)
return handle;
}
static int loop(unsigned ring, int reps)
static int loop(unsigned ring, int reps, unsigned flags)
{
struct drm_i915_gem_execbuffer2 execbuf;
struct drm_i915_gem_exec_object2 gem_exec;
int count, fd;
int fd;
fd = drm_open_driver(DRIVER_INTEL);
@ -93,28 +94,26 @@ static int loop(unsigned ring, int reps)
return 77;
}
for (count = 1; count <= 1<<16; count <<= 1) {
igt_stats_t stats;
int n;
while (reps--) {
struct timespec start, end;
unsigned count = 0;
igt_stats_init_with_size(&stats, reps);
gem_set_domain(fd, gem_exec.handle, I915_GEM_DOMAIN_GTT, 0);
sleep(1); /* wait for the hw to go back to sleep */
for (n = 0; n < reps; n++) {
struct timespec start, end;
int loops = count;
gem_set_domain(fd, gem_exec.handle,
I915_GEM_DOMAIN_GTT, 0);
sleep(1); /* wait for the hw to go back to sleep */
clock_gettime(CLOCK_MONOTONIC, &start);
while (loops--)
do_ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
gem_sync(fd, gem_exec.handle);
clock_gettime(CLOCK_MONOTONIC, &start);
do {
do_ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
count++;
if (flags & SYNC)
gem_sync(fd, gem_exec.handle);
clock_gettime(CLOCK_MONOTONIC, &end);
igt_stats_push(&stats, elapsed(&start, &end, count));
}
} while (elapsed(&start, &end) < 2.);
printf("%7.3f\n", igt_stats_get_trimean(&stats)/1000);
igt_stats_fini(&stats);
gem_sync(fd, gem_exec.handle);
clock_gettime(CLOCK_MONOTONIC, &end);
printf("%7.3f\n", 1e6*elapsed(&start, &end)/count);
}
return 0;
}
@ -122,10 +121,11 @@ static int loop(unsigned ring, int reps)
int main(int argc, char **argv)
{
unsigned ring = I915_EXEC_RENDER;
int reps = 13;
unsigned flags = 0;
int reps = 1;
int c;
while ((c = getopt (argc, argv, "e:r:")) != -1) {
while ((c = getopt (argc, argv, "e:r:s")) != -1) {
switch (c) {
case 'e':
if (strcmp(optarg, "rcs") == 0)
@ -146,10 +146,14 @@ int main(int argc, char **argv)
reps = 1;
break;
case 's':
flags |= SYNC;
break;
default:
break;
}
}
return loop(ring, reps);
return loop(ring, reps, flags);
}