gem_pread: Symmetric measurement to gem_pwrite

diff --git a/tests/Makefile.am b/tests/Makefile.am
index a59c25f..845eb6c 100644 (file)
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -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 \

diff --git a/tests/gem_pread.c b/tests/gem_pread.c
new file mode 100644 (file)
index 0000000..1e755c0
--- /dev/null
+++ b/tests/gem_pread.c
@@ -0,0 +1,134 @@
+/*
+ * 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;
+}