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benchtests: Reallocate buffers for every strncmp implementation

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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);