Commit 5d635f95 authored by Chris Wilson's avatar Chris Wilson 🤔

gem_pread: Symmetric measurement to gem_pwrite

parent aad68d1a
......@@ -71,6 +71,7 @@ TESTS_progs = \
gem_mmap_offset_exhaustion \
gem_pin \
gem_pipe_control_store_loop \
gem_pread \
gem_pwrite \
gem_readwrite \
gem_reg_read \
......
/*
* Copyright © 2011 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Chris Wilson <chris@chris-wilson.co.uk>
*
*/
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <fcntl.h>
#include <inttypes.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
#include "drm.h"
#include "i915_drm.h"
#include "drmtest.h"
#define OBJECT_SIZE 16384
static void do_gem_read(int fd, uint32_t handle, void *buf, int len, int loops)
{
while (loops--)
gem_read(fd, handle, 0, buf, len);
}
static double elapsed(const struct timeval *start,
const struct timeval *end,
int loop)
{
return (1e6*(end->tv_sec - start->tv_sec) + (end->tv_usec - start->tv_usec))/loop;
}
static const char *bytes_per_sec(char *buf, double v)
{
const char *order[] = {
"",
"KiB",
"MiB",
"GiB",
"TiB",
NULL,
}, **o = order;
while (v > 1000 && o[1]) {
v /= 1000;
o++;
}
sprintf(buf, "%.1f%s/s", v, *o);
return buf;
}
int main(int argc, char **argv)
{
int object_size = 0;
uint32_t buf[20];
uint32_t *src, dst;
int fd, count;
drmtest_skip_on_simulation();
if (argc > 1)
object_size = atoi(argv[1]);
if (object_size == 0)
object_size = OBJECT_SIZE;
object_size = (object_size + 3) & -4;
fd = drm_open_any();
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_read(fd, dst, src, object_size, count);
gettimeofday(&end, NULL);
printf("Time to uncached pread %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_read(fd, dst, src, object_size, count);
gettimeofday(&end, NULL);
printf("Time to snooped pread %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);
close(fd);
return 0;
}
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