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/*
* Copyright (c) 2018 Red Hat, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#undef NDEBUG
#include "stopwatch.h"
#include <assert.h>
#include <math.h>
#include <stdio.h>
#include "ovstest.h"
#include "util.h"
#define MAX_SAMPLES 100
#define UNIT SW_MS
struct test_data {
const char *name;
unsigned long long samples[MAX_SAMPLES];
size_t num_samples;
struct stopwatch_stats expected_stats;
};
static struct test_data data_sets[] = {
{
.name = "1-interval-zero-length",
.samples = { 0, 0 },
.num_samples = 2,
.expected_stats = {
.count = 1,
.unit = UNIT,
.max = 0,
.min = 0,
.pctl_95 = 0,
.ewma_50 = 0,
.ewma_1 = 0,
},
},
{
.name = "1-interval-unit-length",
.samples = { 0, 1 },
.num_samples = 2,
.expected_stats = {
.count = 1,
.unit = UNIT,
.max = 1,
.min = 1,
.pctl_95 = 0,
.ewma_50 = 1,
.ewma_1 = 1,
},
},
{
.name = "10-intervals-unit-length",
.samples = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 },
.num_samples = 11,
.expected_stats = {
.count = 10,
.unit = UNIT,
.max = 1,
.min = 1,
.pctl_95 = 1,
.ewma_50 = 1,
.ewma_1 = 1,
},
},
{
.name = "10-intervals-linear-growth",
.samples = { 1, 2, 4, 7, 11, 16, 22, 29, 37, 46, 56 },
.num_samples = 11,
.expected_stats = {
.count = 10,
.unit = UNIT,
.max = 10,
.min = 1,
.pctl_95 = 10.0,
.ewma_50 = 9.0,
.ewma_1 = 1.4,
},
},
{
.name = "60-intervals-unit-length",
.samples = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
51, 52, 53, 54, 55, 56, 57, 58, 59, 60,
61, },
.num_samples = 61,
.expected_stats = {
.count = 60,
.unit = UNIT,
.max = 1,
.min = 1,
.pctl_95 = 1,
.ewma_50 = 1,
.ewma_1 = 1,
},
},
{
.name = "60-intervals-linear-growth",
.samples = { 1, 2, 4, 7, 11, 16, 22, 29, 37, 46,
56, 67, 79, 92, 106, 121, 137, 154, 172, 191,
211, 232, 254, 277, 301, 326, 352, 379, 407, 436,
466, 497, 529, 562, 596, 631, 667, 704, 742, 781,
821, 862, 904, 947, 991, 1036, 1082, 1129, 1177, 1226,
1276, 1327, 1379, 1432, 1486, 1541, 1597, 1654, 1712, 1771,
1831, },
.num_samples = 61,
.expected_stats = {
.count = 60,
.unit = UNIT,
.max = 60,
.min = 1,
/* 95th percentile is actually closer to 57, but the estimate is
* pretty dang close */
.pctl_95 = 56,
.ewma_50 = 59,
.ewma_1 = 15.7,
},
},
};
#define ASSERT_MSG(COND, MSG, ...) \
if (!(COND)) { \
fprintf(stderr, MSG "\n", ##__VA_ARGS__); \
assert(COND); \
}
#define ASSERT_ULL_EQ(a, b) \
ASSERT_MSG(a == b, \
"Assertion '%s == %s' failed: %llu == %llu", \
#a, #b, a, b)
#define ASSERT_DOUBLE_EQ(a, b, eps) \
ASSERT_MSG(fabs(a - b) < eps, \
"Assertion '|%s - %s| < %s' failed: |%g - %g| < %g", \
#a, #b, #eps, a, b, eps)
#define ASSERT_STATS_EQ(a, b) \
do { \
ASSERT_ULL_EQ((a)->count, (b)->count); \
ASSERT_ULL_EQ((a)->max, (b)->max); \
ASSERT_ULL_EQ((a)->min, (b)->min); \
ASSERT_DOUBLE_EQ((a)->pctl_95, (b)->pctl_95, 1e-1); \
ASSERT_DOUBLE_EQ((a)->ewma_50, (b)->ewma_50, 1e-1); \
ASSERT_DOUBLE_EQ((a)->ewma_1, (b)->ewma_1, 1e-1); \
} while (0)
static void
test_stopwatch_calculate_stats(void)
{
struct test_data *d;
for (size_t i = 0; i < ARRAY_SIZE(data_sets); i++) {
d = &data_sets[i];
fprintf(stderr, "TEST '%s'\n", d->name);
stopwatch_create(d->name, UNIT);
for (size_t j = 0; j < d->num_samples - 1; j ++) {
stopwatch_start(d->name, d->samples[j]);
stopwatch_stop(d->name, d->samples[j + 1]);
}
stopwatch_sync();
struct stopwatch_stats stats = { .unit = UNIT };
stopwatch_get_stats(d->name, &stats);
ASSERT_STATS_EQ(&stats, &d->expected_stats);
printf(".");
}
}
static void
test_stopwatch_main(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
{
test_stopwatch_calculate_stats();
printf("\n");
}
OVSTEST_REGISTER("test-stopwatch", test_stopwatch_main);
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