compare android::Vector and std::vector
Have been wondering for a while.
Test: libutils_benchmark
--------------------------------------------------------------------
Benchmark Time CPU Iterations
--------------------------------------------------------------------
BM_fill_android_vector 24.6 ns 24.5 ns 28207074
BM_fill_std_vector 5.24 ns 5.21 ns 130675479
BM_prepend_android_vector 5783 ns 5770 ns 100000
BM_prepend_std_vector 5731 ns 5717 ns 100000
Change-Id: Ie296ce2c4395121b6a456d57421f820909418afe
diff --git a/libutils/Android.bp b/libutils/Android.bp
index 8be4dd0..8a848ce 100644
--- a/libutils/Android.bp
+++ b/libutils/Android.bp
@@ -289,3 +289,9 @@
],
shared_libs: ["libutils_test_singleton1"],
}
+
+cc_benchmark {
+ name: "libutils_benchmark",
+ srcs: ["Vector_benchmark.cpp"],
+ shared_libs: ["libutils"],
+}
diff --git a/libutils/Vector_benchmark.cpp b/libutils/Vector_benchmark.cpp
new file mode 100644
index 0000000..c23d499
--- /dev/null
+++ b/libutils/Vector_benchmark.cpp
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * 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 <benchmark/benchmark.h>
+#include <utils/Vector.h>
+#include <vector>
+
+void BM_fill_android_vector(benchmark::State& state) {
+ android::Vector<char> v;
+ while (state.KeepRunning()) {
+ v.push('A');
+ }
+}
+BENCHMARK(BM_fill_android_vector);
+
+void BM_fill_std_vector(benchmark::State& state) {
+ std::vector<char> v;
+ while (state.KeepRunning()) {
+ v.push_back('A');
+ }
+}
+BENCHMARK(BM_fill_std_vector);
+
+void BM_prepend_android_vector(benchmark::State& state) {
+ android::Vector<char> v;
+ while (state.KeepRunning()) {
+ v.insertAt('A', 0);
+ }
+}
+BENCHMARK(BM_prepend_android_vector);
+
+void BM_prepend_std_vector(benchmark::State& state) {
+ std::vector<char> v;
+ while (state.KeepRunning()) {
+ v.insert(v.begin(), 'A');
+ }
+}
+BENCHMARK(BM_prepend_std_vector);
+
+BENCHMARK_MAIN();