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Bench: Add support for choose direction of memcpy in benchtests

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This patch adds support for testing memcpy with both dst > src and dst
< src. Since memcpy is implemented as memmove which has seperate
control flows for certain sizes depending on dst > src it seems like
1) information that should be provided in the benchtest output and a
variable that can be controlled for the benchmarks.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
This commit is contained in:
Noah Goldstein
2021-05-23 19:36:36 -04:00
parent 94bc766ec6
commit fc335a0ded
3 changed files with 94 additions and 65 deletions
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50
benchtests/bench-memcpy-large.c
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@@ -52,11 +52,12 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, const char *src,
}
static void
do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len)
do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
int both_ways)
{
size_t i, j;
char *s1, *s2;
size_t repeats;
align1 &= 4095;
if (align1 + len >= page_size)
return;
@@ -68,20 +69,27 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len)
s1 = (char *) (buf1 + align1);
s2 = (char *) (buf2 + align2);
for (i = 0, j = 1; i < len; i++, j += 23)
s1[i] = j;
for (repeats = both_ways ? 2 : 1; repeats; --repeats)
{
for (i = 0, j = 1; i < len; i++, j += 23)
s1[i] = j;
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "length", (double) len);
json_attr_uint (json_ctx, "align1", (double) align1);
json_attr_uint (json_ctx, "align2", (double) align2);
json_array_begin (json_ctx, "timings");
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "length", (double) len);
json_attr_uint (json_ctx, "align1", (double) align1);
json_attr_uint (json_ctx, "align2", (double) align2);
json_attr_uint (json_ctx, "dst > src", (double) (s2 > s1));
json_array_begin (json_ctx, "timings");
FOR_EACH_IMPL (impl, 0)
do_one_test (json_ctx, impl, s2, s1, len);
FOR_EACH_IMPL (impl, 0)
do_one_test (json_ctx, impl, s2, s1, len);
json_array_end (json_ctx);
json_element_object_end (json_ctx);
json_array_end (json_ctx);
json_element_object_end (json_ctx);
s1 = (char *) (buf2 + align1);
s2 = (char *) (buf1 + align2);
}
}
int
@@ -109,14 +117,14 @@ test_main (void)
json_array_begin (&json_ctx, "results");
for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
{
do_test (&json_ctx, 0, 0, i + 7);
do_test (&json_ctx, 0, 3, i + 15);
do_test (&json_ctx, 3, 0, i + 31);
do_test (&json_ctx, 3, 5, i + 63);
do_test (&json_ctx, 0, 127, i);
do_test (&json_ctx, 0, 255, i);
do_test (&json_ctx, 0, 256, i);
do_test (&json_ctx, 0, 4064, i);
do_test (&json_ctx, 0, 0, i + 7, 1);
do_test (&json_ctx, 0, 3, i + 15, 1);
do_test (&json_ctx, 3, 0, i + 31, 1);
do_test (&json_ctx, 3, 5, i + 63, 1);
do_test (&json_ctx, 0, 127, i, 1);
do_test (&json_ctx, 0, 255, i, 1);
do_test (&json_ctx, 0, 256, i, 1);
do_test (&json_ctx, 0, 4064, i, 1);
}
json_array_end (&json_ctx);