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Bench: Add support for choose direction of memcpy in benchtests 

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
View File

@ -52,11 +52,12 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, const char *src,
} }
static void 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; size_t i, j;
char *s1, *s2; char *s1, *s2;
size_t repeats;
align1 &= 4095; align1 &= 4095;
if (align1 + len >= page_size) if (align1 + len >= page_size)
return; 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); s1 = (char *) (buf1 + align1);
s2 = (char *) (buf2 + align2); s2 = (char *) (buf2 + align2);
for (i = 0, j = 1; i < len; i++, j += 23) for (repeats = both_ways ? 2 : 1; repeats; --repeats)
s1[i] = j; {
for (i = 0, j = 1; i < len; i++, j += 23)
s1[i] = j;
json_element_object_begin (json_ctx); json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "length", (double) len); json_attr_uint (json_ctx, "length", (double) len);
json_attr_uint (json_ctx, "align1", (double) align1); json_attr_uint (json_ctx, "align1", (double) align1);
json_attr_uint (json_ctx, "align2", (double) align2); json_attr_uint (json_ctx, "align2", (double) align2);
json_array_begin (json_ctx, "timings"); json_attr_uint (json_ctx, "dst > src", (double) (s2 > s1));
json_array_begin (json_ctx, "timings");
FOR_EACH_IMPL (impl, 0) FOR_EACH_IMPL (impl, 0)
do_one_test (json_ctx, impl, s2, s1, len); do_one_test (json_ctx, impl, s2, s1, len);
json_array_end (json_ctx); json_array_end (json_ctx);
json_element_object_end (json_ctx); json_element_object_end (json_ctx);
s1 = (char *) (buf2 + align1);
s2 = (char *) (buf1 + align2);
}
} }
int int
@ -109,14 +117,14 @@ test_main (void)
json_array_begin (&json_ctx, "results"); json_array_begin (&json_ctx, "results");
for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1) for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
{ {
do_test (&json_ctx, 0, 0, i + 7); do_test (&json_ctx, 0, 0, i + 7, 1);
do_test (&json_ctx, 0, 3, i + 15); do_test (&json_ctx, 0, 3, i + 15, 1);
do_test (&json_ctx, 3, 0, i + 31); do_test (&json_ctx, 3, 0, i + 31, 1);
do_test (&json_ctx, 3, 5, i + 63); do_test (&json_ctx, 3, 5, i + 63, 1);
do_test (&json_ctx, 0, 127, i); do_test (&json_ctx, 0, 127, i, 1);
do_test (&json_ctx, 0, 255, i); do_test (&json_ctx, 0, 255, i, 1);
do_test (&json_ctx, 0, 256, i); do_test (&json_ctx, 0, 256, i, 1);
do_test (&json_ctx, 0, 4064, i); do_test (&json_ctx, 0, 4064, i, 1);
} }
json_array_end (&json_ctx); json_array_end (&json_ctx);

33
benchtests/bench-memcpy-walk.c
View File

@ -66,17 +66,30 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, char *src,
} }
static void static void
do_test (json_ctx_t *json_ctx, size_t len) do_test (json_ctx_t *json_ctx, size_t len, int both_ways)
{ {
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "length", (double) len);
json_array_begin (json_ctx, "timings");
FOR_EACH_IMPL (impl, 0) char *s1, *s2;
do_one_test (json_ctx, impl, (char *) buf2, (char *) buf1, len); size_t repeats;
s1 = (char *) (buf1);
s2 = (char *) (buf2);
json_array_end (json_ctx); for (repeats = both_ways ? 2 : 1; repeats; --repeats)
json_element_object_end (json_ctx); {
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "length", (double) len);
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);
json_array_end (json_ctx);
json_element_object_end (json_ctx);
s1 = (char *) (buf2);
s2 = (char *) (buf1);
}
} }
int int
@ -103,8 +116,8 @@ test_main (void)
json_array_begin (&json_ctx, "results"); json_array_begin (&json_ctx, "results");
for (size_t i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1) for (size_t i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
{ {
do_test (&json_ctx, i); do_test (&json_ctx, i, 1);
do_test (&json_ctx, i + 1); do_test (&json_ctx, i + 1, 1);
} }
json_array_end (&json_ctx); json_array_end (&json_ctx);

76
benchtests/bench-memcpy.c
View File

@ -54,11 +54,12 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, const char *src,
} }
static void 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; size_t i, j;
char *s1, *s2; char *s1, *s2;
size_t repeats;
align1 &= 63; align1 &= 63;
if (align1 + len >= page_size) if (align1 + len >= page_size)
return; return;
@ -70,20 +71,27 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len)
s1 = (char *) (buf1 + align1); s1 = (char *) (buf1 + align1);
s2 = (char *) (buf2 + align2); s2 = (char *) (buf2 + align2);
for (i = 0, j = 1; i < len; i++, j += 23) for (repeats = both_ways ? 2 : 1; repeats; --repeats)
s1[i] = j; {
for (i = 0, j = 1; i < len; i++, j += 23)
s1[i] = j;
json_element_object_begin (json_ctx); json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "length", (double) len); json_attr_uint (json_ctx, "length", (double) len);
json_attr_uint (json_ctx, "align1", (double) align1); json_attr_uint (json_ctx, "align1", (double) align1);
json_attr_uint (json_ctx, "align2", (double) align2); json_attr_uint (json_ctx, "align2", (double) align2);
json_array_begin (json_ctx, "timings"); json_attr_uint (json_ctx, "dst > src", (double) (s2 > s1));
json_array_begin (json_ctx, "timings");
FOR_EACH_IMPL (impl, 0) FOR_EACH_IMPL (impl, 0)
do_one_test (json_ctx, impl, s2, s1, len); do_one_test (json_ctx, impl, s2, s1, len);
json_array_end (json_ctx); json_array_end (json_ctx);
json_element_object_end (json_ctx); json_element_object_end (json_ctx);
s1 = (char *) (buf2 + align1);
s2 = (char *) (buf1 + align2);
}
} }
int int
@ -111,46 +119,46 @@ test_main (void)
json_array_begin (&json_ctx, "results"); json_array_begin (&json_ctx, "results");
for (i = 0; i < 18; ++i) for (i = 0; i < 18; ++i)
{ {
do_test (&json_ctx, 0, 0, 1 << i); do_test (&json_ctx, 0, 0, 1 << i, 1);
do_test (&json_ctx, i, 0, 1 << i); do_test (&json_ctx, i, 0, 1 << i, 1);
do_test (&json_ctx, 0, i, 1 << i); do_test (&json_ctx, 0, i, 1 << i, 1);
do_test (&json_ctx, i, i, 1 << i); do_test (&json_ctx, i, i, 1 << i, 1);
} }
for (i = 0; i < 32; ++i) for (i = 0; i < 32; ++i)
{ {
do_test (&json_ctx, 0, 0, i); do_test (&json_ctx, 0, 0, i, 0);
do_test (&json_ctx, i, 0, i); do_test (&json_ctx, i, 0, i, 0);
do_test (&json_ctx, 0, i, i); do_test (&json_ctx, 0, i, i, 0);
do_test (&json_ctx, i, i, i); do_test (&json_ctx, i, i, i, 0);
} }
for (i = 3; i < 32; ++i) for (i = 3; i < 32; ++i)
{ {
if ((i & (i - 1)) == 0) if ((i & (i - 1)) == 0)
continue; continue;
do_test (&json_ctx, 0, 0, 16 * i); do_test (&json_ctx, 0, 0, 16 * i, 1);
do_test (&json_ctx, i, 0, 16 * i); do_test (&json_ctx, i, 0, 16 * i, 1);
do_test (&json_ctx, 0, i, 16 * i); do_test (&json_ctx, 0, i, 16 * i, 1);
do_test (&json_ctx, i, i, 16 * i); do_test (&json_ctx, i, i, 16 * i, 1);
} }
for (i = 32; i < 64; ++i) for (i = 32; i < 64; ++i)
{ {
do_test (&json_ctx, 0, 0, 32 * i); do_test (&json_ctx, 0, 0, 32 * i, 1);
do_test (&json_ctx, i, 0, 32 * i); do_test (&json_ctx, i, 0, 32 * i, 1);
do_test (&json_ctx, 0, i, 32 * i); do_test (&json_ctx, 0, i, 32 * i, 1);
do_test (&json_ctx, i, i, 32 * i); do_test (&json_ctx, i, i, 32 * i, 1);
} }
do_test (&json_ctx, 0, 0, getpagesize ()); do_test (&json_ctx, 0, 0, getpagesize (), 1);
for (i = 0; i <= 32; ++i) for (i = 0; i <= 32; ++i)
{ {
do_test (&json_ctx, 0, 0, 2048 + 64 * i); do_test (&json_ctx, 0, 0, 2048 + 64 * i, 1);
do_test (&json_ctx, i, 0, 2048 + 64 * i); do_test (&json_ctx, i, 0, 2048 + 64 * i, 1);
do_test (&json_ctx, 0, i, 2048 + 64 * i); do_test (&json_ctx, 0, i, 2048 + 64 * i, 1);
do_test (&json_ctx, i, i, 2048 + 64 * i); do_test (&json_ctx, i, i, 2048 + 64 * i, 1);
} }
json_array_end (&json_ctx); json_array_end (&json_ctx);