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gem_pwrite: Time pwrites to both uncached/snooped memory

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This commit is contained in:
Chris Wilson 2013-08-06 15:12:55 +01:00
parent a661c098b0
commit aad68d1a86
1 changed files with 18 additions and 1 deletions
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19
tests/gem_pwrite.c
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@ -103,18 +103,35 @@ int main(int argc, char **argv)
dst = gem_create(fd, object_size);
src = malloc(object_size);
gem_set_cacheing(fd, dst, 0);
for (count = 1; count <= 1<<17; count <<= 1) {
struct timeval start, end;
gettimeofday(&start, NULL);
do_gem_write(fd, dst, src, object_size, count);
gettimeofday(&end, NULL);
printf("Time to pwrite %d bytes x %6d: %7.3fµs, %s\n",
printf("Time to uncached pwrite %d bytes x %6d: %7.3fµs, %s\n",
object_size, count,
elapsed(&start, &end, count),
bytes_per_sec((char *)buf, object_size/elapsed(&start, &end, count)*1e6));
fflush(stdout);
}
gem_set_cacheing(fd, dst, 1);
for (count = 1; count <= 1<<17; count <<= 1) {
struct timeval start, end;
gettimeofday(&start, NULL);
do_gem_write(fd, dst, src, object_size, count);
gettimeofday(&end, NULL);
printf("Time to snooped pwrite %d bytes x %6d: %7.3fµs, %s\n",
object_size, count,
elapsed(&start, &end, count),
bytes_per_sec((char *)buf, object_size/elapsed(&start, &end, count)*1e6));
fflush(stdout);
}
free(src);
gem_close(fd, dst);