From 68cf8cc9a244041f859dc484abe551b8e018ad05 Mon Sep 17 00:00:00 2001
From: Andrei Vagin <avagin@gmail.com>
Date: Sat, 24 Jul 2021 17:09:33 -0700
Subject: Don't create an extra fd bitmap to allocate a new fd.

---
 test/perf/linux/dup_benchmark.cc | 57 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 test/perf/linux/dup_benchmark.cc

(limited to 'test/perf/linux/dup_benchmark.cc')

diff --git a/test/perf/linux/dup_benchmark.cc b/test/perf/linux/dup_benchmark.cc
new file mode 100644
index 000000000..fcf14368b
--- /dev/null
+++ b/test/perf/linux/dup_benchmark.cc
@@ -0,0 +1,57 @@
+// 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 <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "benchmark/benchmark.h"
+#include "test/util/fs_util.h"
+#include "test/util/logging.h"
+#include "test/util/temp_path.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+void BM_Dup(benchmark::State& state) {
+  const int size = state.range(0);
+
+  for (auto _ : state) {
+    std::vector<int> v;
+    for (int i = 0; i < size; i++) {
+      int fd = dup(2);
+      TEST_CHECK(fd != -1);
+      v.push_back(fd);
+    }
+    for (int i = 0; i < size; i++) {
+      int fd = v[i];
+      close(fd);
+    }
+  }
+  state.SetItemsProcessed(state.iterations() * size);
+}
+
+BENCHMARK(BM_Dup)->Range(1, 1 << 15)->UseRealTime();
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor
-- 
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