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benchmarks/gem_exec_ctx: Run for a fixed time

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Rather than investigate the curve for dispatch latency, just run for a
fixed time and report an average latency. Instead offer two modes,
average single dispatch latency, average continuous dispatch latency.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2016-01-02 12:10:14 +00:00
parent 276fb3d3f4
commit 6953899beb
1 changed files with 50 additions and 45 deletions
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95
benchmarks/gem_exec_ctx.c
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@ -45,15 +45,15 @@
#include "igt_stats.h" #include "igt_stats.h"
enum mode { NOP, CREATE, SWITCH, DEFAULT }; enum mode { NOP, CREATE, SWITCH, DEFAULT };
#define SYNC 0x1
#define LOCAL_I915_EXEC_NO_RELOC (1<<11) #define LOCAL_I915_EXEC_NO_RELOC (1<<11)
#define LOCAL_I915_EXEC_HANDLE_LUT (1<<12) #define LOCAL_I915_EXEC_HANDLE_LUT (1<<12)
static uint64_t elapsed(const struct timespec *start, static double elapsed(const struct timespec *start,
const struct timespec *end, const struct timespec *end)
int loop)
{ {
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) static int __gem_execbuf(int fd, struct drm_i915_gem_execbuffer2 *execbuf)
@ -82,11 +82,11 @@ static uint32_t __gem_context_create(int fd)
return create.ctx_id; return create.ctx_id;
} }
static int loop(unsigned ring, int reps, enum mode mode) static int loop(unsigned ring, int reps, enum mode mode, unsigned flags)
{ {
struct drm_i915_gem_execbuffer2 execbuf; struct drm_i915_gem_execbuffer2 execbuf;
struct drm_i915_gem_exec_object2 gem_exec; struct drm_i915_gem_exec_object2 gem_exec;
int count, fds[2], fd; int fds[2], fd;
uint32_t ctx; uint32_t ctx;
fd = fds[0] = drm_open_driver(DRIVER_INTEL); fd = fds[0] = drm_open_driver(DRIVER_INTEL);
@ -115,49 +115,49 @@ static int loop(unsigned ring, int reps, enum mode mode)
} }
ctx = gem_context_create(fd); ctx = gem_context_create(fd);
for (count = 1; count <= 1<<16; count <<= 1) { while (reps--) {
igt_stats_t stats; struct timespec start, end;
int n; unsigned count = 0;
igt_stats_init_with_size(&stats, reps); sleep(1); /* wait for the hw to go back to sleep */
for (n = 0; n < reps; n++) { clock_gettime(CLOCK_MONOTONIC, &start);
struct timespec start, end; do {
int loops = count; uint32_t tmp;
sleep(1); /* wait for the hw to go back to sleep */ switch (mode) {
clock_gettime(CLOCK_MONOTONIC, &start); case CREATE:
while (loops--) { ctx = execbuf.rsvd1;
uint32_t tmp; execbuf.rsvd1 = gem_context_create(fd);
switch (mode) { break;
case CREATE:
ctx = execbuf.rsvd1;
execbuf.rsvd1 = gem_context_create(fd);
break;
case SWITCH: case SWITCH:
tmp = execbuf.rsvd1; tmp = execbuf.rsvd1;
execbuf.rsvd1 = ctx; execbuf.rsvd1 = ctx;
ctx = tmp; ctx = tmp;
break; break;
case DEFAULT: case DEFAULT:
fd = fds[loops & 1]; fd = fds[count & 1];
break; break;
case NOP: case NOP:
break; break;
}
do_ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
if (mode == CREATE)
gem_context_destroy(fd, ctx);
} }
gem_sync(fd, gem_exec.handle); do_ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
clock_gettime(CLOCK_MONOTONIC, &end); count++;
igt_stats_push(&stats, elapsed(&start, &end, count)); if (mode == CREATE)
} gem_context_destroy(fd, ctx);
printf("%7.3f\n", igt_stats_get_trimean(&stats)/1000); if (flags & SYNC)
igt_stats_fini(&stats); gem_sync(fd, gem_exec.handle);
clock_gettime(CLOCK_MONOTONIC, &end);
} while (elapsed(&start, &end) < 2.);
gem_sync(fd, gem_exec.handle);
clock_gettime(CLOCK_MONOTONIC, &end);
printf("%7.3f\n", 1e6*elapsed(&start, &end) / count);
} }
return 0; return 0;
} }
@ -165,11 +165,12 @@ static int loop(unsigned ring, int reps, enum mode mode)
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
unsigned ring = I915_EXEC_RENDER; unsigned ring = I915_EXEC_RENDER;
unsigned flags = 0;
enum mode mode = NOP; enum mode mode = NOP;
int reps = 13; int reps = 1;
int c; int c;
while ((c = getopt (argc, argv, "e:r:b:")) != -1) { while ((c = getopt (argc, argv, "e:r:b:s")) != -1) {
switch (c) { switch (c) {
case 'e': case 'e':
if (strcmp(optarg, "rcs") == 0) if (strcmp(optarg, "rcs") == 0)
@ -203,10 +204,14 @@ int main(int argc, char **argv)
reps = 1; reps = 1;
break; break;
case 's':
flags |= SYNC;
break;
default: default:
break; break;
} }
} }
return loop(ring, reps, mode); return loop(ring, reps, mode, flags);
} }