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benchtests: Reallocate buffers for every strncmp implementation 

Don't reuse buffers for different strncmp implementations since the
earlier implementation will end up warming the cache for the later
one.  Eventually there should be a more elegant way to do this.

	* benchtests/bench-strncmp.c (do_test_limit): Reallocate buffers
	for every implementation.
	(do_test): Likewise.
This commit is contained in:
Siddhesh Poyarekar 2018-03-06 18:29:52 +05:30
parent ad4e816e06
commit 7bb3a8a556
1 changed files with 53 additions and 44 deletions
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97
benchtests/bench-strncmp.c
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@ -139,8 +139,6 @@ do_test_limit (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
if (n == 0)
{
s1 = (CHAR *) (buf1 + page_size);
s2 = (CHAR *) (buf2 + page_size);
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "strlen", (double) len);
json_attr_uint (json_ctx, "len", (double) n);
@ -149,7 +147,12 @@ do_test_limit (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
json_array_begin (json_ctx, "timings");
FOR_EACH_IMPL (impl, 0)
do_one_test (json_ctx, impl, s1, s2, n, 0);
{
realloc_bufs ();
s1 = (CHAR *) (buf1 + page_size);
s2 = (CHAR *) (buf2 + page_size);
do_one_test (json_ctx, impl, s1, s2, n, 0);
}
json_array_end (json_ctx);
json_element_object_end (json_ctx);
@ -161,28 +164,6 @@ do_test_limit (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
align2 &= 15;
align_n = (page_size - n * CHARBYTES) & 15;
s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);
s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);
if (align1 < align_n)
s1 = (CHAR *) ((char *) s1 - (align_n - align1));
if (align2 < align_n)
s2 = (CHAR *) ((char *) s2 - (align_n - align2));
for (i = 0; i < n; i++)
s1[i] = s2[i] = 1 + 23 * i % max_char;
if (len < n)
{
s1[len] = 0;
s2[len] = 0;
if (exp_result < 0)
s2[len] = 32;
else if (exp_result > 0)
s1[len] = 64;
}
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "strlen", (double) len);
json_attr_uint (json_ctx, "len", (double) n);
@ -191,7 +172,32 @@ do_test_limit (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
json_array_begin (json_ctx, "timings");
FOR_EACH_IMPL (impl, 0)
do_one_test (json_ctx, impl, s1, s2, n, exp_result);
{
realloc_bufs ();
s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);
s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);
if (align1 < align_n)
s1 = (CHAR *) ((char *) s1 - (align_n - align1));
if (align2 < align_n)
s2 = (CHAR *) ((char *) s2 - (align_n - align2));
for (i = 0; i < n; i++)
s1[i] = s2[i] = 1 + 23 * i % max_char;
if (len < n)
{
s1[len] = 0;
s2[len] = 0;
if (exp_result < 0)
s2[len] = 32;
else if (exp_result > 0)
s1[len] = 64;
}
do_one_test (json_ctx, impl, s1, s2, n, exp_result);
}
json_array_end (json_ctx);
json_element_object_end (json_ctx);
@ -215,23 +221,6 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, size_t
if (align2 + (n + 1) * CHARBYTES >= page_size)
return;
s1 = (CHAR *) (buf1 + align1);
s2 = (CHAR *) (buf2 + align2);
for (i = 0; i < n; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
s1[n] = 24 + exp_result;
s2[n] = 23;
s1[len] = 0;
s2[len] = 0;
if (exp_result < 0)
s2[len] = 32;
else if (exp_result > 0)
s1[len] = 64;
if (len >= n)
s2[n - 1] -= exp_result;
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "strlen", (double) len);
json_attr_uint (json_ctx, "len", (double) n);
@ -240,7 +229,27 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, size_t
json_array_begin (json_ctx, "timings");
FOR_EACH_IMPL (impl, 0)
do_one_test (json_ctx, impl, s1, s2, n, exp_result);
{
realloc_bufs ();
s1 = (CHAR *) (buf1 + align1);
s2 = (CHAR *) (buf2 + align2);
for (i = 0; i < n; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
s1[n] = 24 + exp_result;
s2[n] = 23;
s1[len] = 0;
s2[len] = 0;
if (exp_result < 0)
s2[len] = 32;
else if (exp_result > 0)
s1[len] = 64;
if (len >= n)
s2[n - 1] -= exp_result;
do_one_test (json_ctx, impl, s1, s2, n, exp_result);
}
json_array_end (json_ctx);
json_element_object_end (json_ctx);