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benchtests: Improve reliability of memcmp benchmarks

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No bug. Remove reallocation of bufs between implementation tests. Move
initialization outside of foreach implementation test loop. Increase
iteration count.

Generally before this commit was seeing a great deal of variability
between runs. The goal of this commit is to make the results more
reliable.

Benchtests build and bench-memcmp succeeding.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
This commit is contained in:
Noah Goldstein 2021-09-18 16:13:34 -05:00
parent 8807e560c0
commit a1c056c9d0
1 changed files with 11 additions and 12 deletions
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23
benchtests/bench-memcmp.c
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@ -63,7 +63,7 @@ static void
do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s1,
const CHAR *s2, size_t len, int exp_result)
{
size_t i, iters = INNER_LOOP_ITERS8;
size_t i, iters = INNER_LOOP_ITERS_LARGE;
timing_t start, stop, cur;
TIMING_NOW (start);
@ -103,20 +103,19 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
json_attr_uint (json_ctx, "result", (double) exp_result);
json_array_begin (json_ctx, "timings");
s1 = (CHAR *)(buf1 + align1);
s2 = (CHAR *)(buf2 + align2);
for (i = 0; i < len; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % MAX_CHAR;
s1[len] = align1;
s2[len] = align2;
s2[len - 1] -= exp_result;
FOR_EACH_IMPL (impl, 0)
{
s1 = (CHAR *) (buf1 + align1);
s2 = (CHAR *) (buf2 + align2);
for (i = 0; i < len; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % MAX_CHAR;
s1[len] = align1;
s2[len] = align2;
s2[len - 1] -= exp_result;
do_one_test (json_ctx, impl, s1, s2, len, exp_result);
alloc_bufs ();
}
json_array_end (json_ctx);