| Message ID | 20240424225705.929812-11-richard.henderson@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Optimize buffer_is_zero | expand |
On 25/4/24 00:57, Richard Henderson wrote: > Benchmark each acceleration function vs an aligned buffer of zeros. > > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > tests/bench/bufferiszero-bench.c | 47 ++++++++++++++++++++++++++++++++ > tests/bench/meson.build | 1 + > 2 files changed, 48 insertions(+) > create mode 100644 tests/bench/bufferiszero-bench.c > +static void test(const void *opaque) > +{ > + size_t max = 64 * KiB; > + void *buf = g_malloc0(max); > + int accel_index = 0; Nitpicking, accel_index could be unsigned like in util/bufferiszero.c. > + > + do { > + if (accel_index != 0) { > + g_test_message("%s", ""); /* gnu_printf Werror for simple "" */ > + } > + for (size_t len = 1 * KiB; len <= max; len *= 4) { > + double total = 0.0; > + > + g_test_timer_start(); > + do { > + buffer_is_zero_ge256(buf, len); > + total += len; > + } while (g_test_timer_elapsed() < 0.5); > + > + total /= MiB; > + g_test_message("buffer_is_zero #%d: %2zuKB %8.0f MB/sec", > + accel_index, len / (size_t)KiB, Thus "buffer_is_zero #%u:..." Regardless, Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> > + total / g_test_timer_last()); > + } > + accel_index++; > + } while (test_buffer_is_zero_next_accel()); > + > + g_free(buf); > +}
diff --git a/tests/bench/bufferiszero-bench.c b/tests/bench/bufferiszero-bench.c new file mode 100644 index 0000000000..222695c1fa --- /dev/null +++ b/tests/bench/bufferiszero-bench.c @@ -0,0 +1,47 @@ +/* + * QEMU buffer_is_zero speed benchmark + * + * This work is licensed under the terms of the GNU GPL, version 2 or + * (at your option) any later version. See the COPYING file in the + * top-level directory. + */ +#include "qemu/osdep.h" +#include "qemu/cutils.h" +#include "qemu/units.h" + +static void test(const void *opaque) +{ + size_t max = 64 * KiB; + void *buf = g_malloc0(max); + int accel_index = 0; + + do { + if (accel_index != 0) { + g_test_message("%s", ""); /* gnu_printf Werror for simple "" */ + } + for (size_t len = 1 * KiB; len <= max; len *= 4) { + double total = 0.0; + + g_test_timer_start(); + do { + buffer_is_zero_ge256(buf, len); + total += len; + } while (g_test_timer_elapsed() < 0.5); + + total /= MiB; + g_test_message("buffer_is_zero #%d: %2zuKB %8.0f MB/sec", + accel_index, len / (size_t)KiB, + total / g_test_timer_last()); + } + accel_index++; + } while (test_buffer_is_zero_next_accel()); + + g_free(buf); +} + +int main(int argc, char **argv) +{ + g_test_init(&argc, &argv, NULL); + g_test_add_data_func("/cutils/bufferiszero/speed", NULL, test); + return g_test_run(); +} diff --git a/tests/bench/meson.build b/tests/bench/meson.build index 7e76338a52..4cd7a2f6b5 100644 --- a/tests/bench/meson.build +++ b/tests/bench/meson.build @@ -21,6 +21,7 @@ benchs = {} if have_block benchs += { + 'bufferiszero-bench': [], 'benchmark-crypto-hash': [crypto], 'benchmark-crypto-hmac': [crypto], 'benchmark-crypto-cipher': [crypto],
Benchmark each acceleration function vs an aligned buffer of zeros. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- tests/bench/bufferiszero-bench.c | 47 ++++++++++++++++++++++++++++++++ tests/bench/meson.build | 1 + 2 files changed, 48 insertions(+) create mode 100644 tests/bench/bufferiszero-bench.c