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benchtests: Reallocate buffers for every test run 

Keeping the buffers the same across test runs gives later invocations
the advantage since they access cached data.  Reallocate so that all
test runs are on equal grounds.

	* benchtests/bench-memcmp.c (do_test): Call realloc_buf for
	every test run.
This commit is contained in:
Siddhesh Poyarekar 2018-02-02 09:55:45 +05:30
parent 39f898c692
commit 3dfcbfa1a4
2 changed files with 19 additions and 11 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2018-02-02 Siddhesh Poyarekar <siddhesh@sourceware.org>
* benchtests/bench-memcmp.c (do_test): Call realloc_buf for
every test run.
2018-02-01 Joseph Myers <joseph@codesourcery.com>
* sysdeps/unix/sysv/linux/syscall-names.list: Update kernel

25
benchtests/bench-memcmp.c
View File

@ -110,20 +110,23 @@ do_test (size_t align1, size_t align2, size_t len, int exp_result)
if (align2 + (len + 1) * CHARBYTES >= page_size)
return;
s1 = (CHAR *) (buf1 + align1);
s2 = (CHAR *) (buf2 + align2);
for (i = 0; i < len; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % CHAR__MAX;
s1[len] = align1;
s2[len] = align2;
s2[len - 1] -= exp_result;
printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s1, s2, len, exp_result);
{
s1 = (CHAR *) (buf1 + align1);
s2 = (CHAR *) (buf2 + align2);
for (i = 0; i < len; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % CHAR__MAX;
s1[len] = align1;
s2[len] = align2;
s2[len - 1] -= exp_result;
do_one_test (impl, s1, s2, len, exp_result);
realloc_bufs ();
}
putchar ('\n');
}