LXR qemu/tests/bench/bufferiszero-bench.c

   1/*
   2 * QEMU buffer_is_zero speed benchmark
   3 *
   4 * This work is licensed under the terms of the GNU GPL, version 2 or
   5 * (at your option) any later version.  See the COPYING file in the
   6 * top-level directory.
   7 */
   8#include "qemu/osdep.h"
   9#include "qemu/cutils.h"
  10#include "qemu/units.h"
  11
  12static void test(const void *opaque)
  13{
  14    size_t max = 64 * KiB;
  15    void *buf = g_malloc0(max);
  16    int accel_index = 0;
  17
  18    do {
  19        if (accel_index != 0) {
  20            g_test_message("%s", "");  /* gnu_printf Werror for simple "" */
  21        }
  22        for (size_t len = 1 * KiB; len <= max; len *= 4) {
  23            double total = 0.0;
  24
  25            g_test_timer_start();
  26            do {
  27                buffer_is_zero_ge256(buf, len);
  28                total += len;
  29            } while (g_test_timer_elapsed() < 0.5);
  30
  31            total /= MiB;
  32            g_test_message("buffer_is_zero #%d: %2zuKB %8.0f MB/sec",
  33                           accel_index, len / (size_t)KiB,
  34                           total / g_test_timer_last());
  35        }
  36        accel_index++;
  37    } while (test_buffer_is_zero_next_accel());
  38
  39    g_free(buf);
  40}
  41
  42int main(int argc, char **argv)
  43{
  44    g_test_init(&argc, &argv, NULL);
  45    g_test_add_data_func("/cutils/bufferiszero/speed", NULL, test);
  46    return g_test_run();
  47}
  48