SERVER-32785 integrate Google Benchmark with SCons

2 files changed, 60 insertions, 0 deletions

diff --git a/src/mongo/unittest/SConscript b/src/mongo/unittest/SConscript
index 5dfd2e9f852..aeb99938cc5 100644
--- a/src/mongo/unittest/SConscript
+++ b/src/mongo/unittest/SConscript
@@ -38,6 +38,13 @@ env.CppUnitTest('unittest_test', 'unittest_test.cpp')
 env.CppUnitTest('fixture_test', 'fixture_test.cpp')
 env.CppUnitTest('temp_dir_test', 'temp_dir_test.cpp')
 
+env.Benchmark(
+    target='benchmark_test',
+    source=[
+        'benchmark_test.cpp',
+    ],
+)
+
 env.Library(
     target='concurrency',
     source=[
diff --git a/src/mongo/unittest/benchmark_test.cpp b/src/mongo/unittest/benchmark_test.cpp
new file mode 100644
index 00000000000..4949e5df668
--- /dev/null
+++ b/src/mongo/unittest/benchmark_test.cpp
@@ -0,0 +1,53 @@
+/**
+ *    Copyright (C) 2018 MongoDB Inc.
+ *
+ *    This program is free software: you can redistribute it and/or  modify
+ *    it under the terms of the GNU Affero General Public License, version 3,
+ *    as published by the Free Software Foundation.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Affero General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Affero General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the prograxm with the OpenSSL library. You
+ *    must comply with the GNU Affero General Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include <benchmark/benchmark.h>
+
+namespace {
+
+// This is a trivial test case to sanity check that "benchmark" runs.
+// For more information on how benchmarks should be written, please refer to Google Benchmark's
+// excellent README: https://github.com/google/benchmark/blob/v1.3.0/README.md
+void BM_empty(benchmark::State& state) {
+    for (auto keepRunning : state) {
+        // The code inside this for-loop is what's being timed.
+        benchmark::DoNotOptimize(state.iterations());
+    }
+}
+
+// Register two benchmarks, one runs the "BM_empty" function in a single thread, the other runs a
+// copy per CPU core.
+BENCHMARK(BM_empty);
+BENCHMARK(BM_empty)->ThreadPerCpu();
+
+}  // namespace
+
+// This function executes previously registered benchmarks.
+BENCHMARK_MAIN();