Add basic microbenchmarks.

PiperOrigin-RevId: 296104390

1 files changed, 66 insertions, 0 deletions

diff --git a/test/perf/linux/unlink_benchmark.cc b/test/perf/linux/unlink_benchmark.cc
new file mode 100644
index 000000000..92243a042
--- /dev/null
+++ b/test/perf/linux/unlink_benchmark.cc
@@ -0,0 +1,66 @@
+// Copyright 2020 The gVisor Authors.
+//
+// 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 <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "gtest/gtest.h"
+#include "benchmark/benchmark.h"
+#include "test/util/fs_util.h"
+#include "test/util/temp_path.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+// Creates a directory containing `files` files, and unlinks all the files.
+void BM_Unlink(benchmark::State& state) {
+  // Create directory with given files.
+  const int file_count = state.range(0);
+
+  // We unlink all files on each iteration, but report this as a "batch"
+  // iteration so that reported times are per file.
+  TempPath dir;
+  while (state.KeepRunningBatch(file_count)) {
+    state.PauseTiming();
+    // N.B. dir is declared outside the loop so that destruction of the previous
+    // iteration's directory occurs here, inside of PauseTiming.
+    dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
+
+    std::vector<TempPath> files;
+    for (int i = 0; i < file_count; i++) {
+      TempPath file =
+          ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir.path()));
+      files.push_back(std::move(file));
+    }
+    state.ResumeTiming();
+
+    while (!files.empty()) {
+      // Destructor unlinks.
+      files.pop_back();
+    }
+  }
+
+  state.SetItemsProcessed(state.iterations());
+}
+
+BENCHMARK(BM_Unlink)->Range(1, 100 * 1000)->UseRealTime();
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor