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app/test: improve accuracy on hash measurements

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Cycles per hash calculation were measured per single operation.
It is much more accurate to run several iterations between measurements
and divide by number of iterations.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
This commit is contained in:
Pablo de Lara 2015-06-10 16:25:19 +01:00 committed by Thomas Monjalon
parent 4de41856c5
commit 4072a35a87
1 changed files with 9 additions and 9 deletions
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18
app/test/test_hash_functions.c
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@ -83,21 +83,21 @@ static void
run_hash_func_perf_test(rte_hash_function f, uint32_t init_val,
uint32_t key_len)
{
static uint8_t key[RTE_HASH_KEY_LENGTH_MAX];
uint64_t ticks = 0, start, end;
static uint8_t key[HASHTEST_ITERATIONS][RTE_HASH_KEY_LENGTH_MAX];
uint64_t ticks, start, end;
unsigned i, j;
for (i = 0; i < HASHTEST_ITERATIONS; i++) {
for (j = 0; j < key_len; j++)
key[j] = (uint8_t) rte_rand();
start = rte_rdtsc();
f(key, key_len, init_val);
end = rte_rdtsc();
ticks += end - start;
key[i][j] = (uint8_t) rte_rand();
}
start = rte_rdtsc();
for (i = 0; i < HASHTEST_ITERATIONS; i++)
f(key[i], key_len, init_val);
end = rte_rdtsc();
ticks = end - start;
printf("%-12s, %-18u, %-13u, %.02f\n", get_hash_name(f), (unsigned) key_len,
(unsigned) init_val, (double)ticks / HASHTEST_ITERATIONS);
}