2 * Copyright 2014 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <folly/Logging.h>
18 #include <gflags/gflags.h>
19 #include <gtest/gtest.h>
20 #include <folly/Benchmark.h>
23 TEST(LogEveryMs, basic) {
24 std::vector<std::chrono::steady_clock::time_point> hist;
26 while (hist.size() < 10) {
27 FB_LOG_EVERY_MS(INFO, 10)
28 << "test msg " << (hist.push_back(std::chrono::steady_clock::now()),
32 bool atLeastOneIsGood = false;
33 for (int i = 0; i < hist.size() - 1; ++i) {
34 auto delta = hist[i + 1] - hist[i];
35 if (delta > std::chrono::milliseconds(5) &&
36 delta < std::chrono::milliseconds(15)) {
37 atLeastOneIsGood = true;
40 EXPECT_TRUE(atLeastOneIsGood);
43 BENCHMARK(skip_overhead, iter) {
44 auto prev = FLAGS_minloglevel;
45 FLAGS_minloglevel = 2;
47 for (unsigned i = 0; i < iter; ++i) {
48 FB_LOG_EVERY_MS(INFO, 1000) << "every 1s";
51 FLAGS_minloglevel = prev;
54 BENCHMARK(dev_null_log_overhead, iter) {
55 auto prev = FLAGS_minloglevel;
56 FLAGS_minloglevel = 2;
58 for (unsigned i = 0; i < iter; ++i) {
59 FB_LOG_EVERY_MS(INFO, -1) << "every -1ms";
62 FLAGS_minloglevel = prev;
65 // ============================================================================
66 // folly/test/LoggingTest.cpp relative time/iter iters/s
67 // ============================================================================
68 // skip_overhead 36.37ns 27.49M
69 // dev_null_log_overhead 2.61us 382.57K
70 // ============================================================================
72 int main(int argc, char** argv) {
73 testing::InitGoogleTest(&argc, argv);
74 google::ParseCommandLineFlags(&argc, &argv, true);
76 auto rv = RUN_ALL_TESTS();
77 if (!rv && FLAGS_benchmark) {
78 folly::runBenchmarks();