flywithu/ntel-gpu-tools
1
0
Fork 0
mirror of https://github.com/tiagovignatti/intel-gpu-tools.git synced 2025-11-04 03:58:27 +00:00
Code Issues Releases Wiki Activity

gem_gtt_speed: Add a test that caches the mmapping across iterations

Browse Source 
Repeat the memset streaming performance test on the same mapping so that
we can factor out the overhead of establishing the GTT/CPU mmaps.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-09-13 15:05:34 +01:00
parent f256ada3b6
commit 397cd4acd1
1 changed files with 18 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
tests/gem_gtt_speed.c
View File

@ -143,6 +143,15 @@ int main(int argc, char **argv)
gettimeofday(&end, NULL);
printf("Time to clear %dk through a CPU map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
gettimeofday(&start, NULL);
base = gem_mmap__cpu(fd, handle, size, PROT_READ | PROT_WRITE);
for (loop = 0; loop < 1000; loop++)
memset(base, 0, size);
munmap(base, size);
gettimeofday(&end, NULL);
printf("Time to clear %dk through a cached CPU map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
}
/* CPU pwrite */
@ -221,6 +230,15 @@ int main(int argc, char **argv)
printf("Time to clear %dk through a GTT map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
gettimeofday(&start, NULL);{
uint32_t *base = gem_mmap(fd, handle, size, PROT_READ | PROT_WRITE);
for (loop = 0; loop < 1000; loop++)
memset(base, 0, size);
munmap(base, size);
} gettimeofday(&end, NULL);
printf("Time to clear %dk through a cached GTT map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
/* mmap read */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {