30b48cb1b3
I've put some work into the Google Benchmark library in order to make it easier to benchmark libc++. These changes have already been upstreamed into Google Benchmark and this patch applies the changes to the in-tree version. The main improvement in the addition of a 'compare_bench.py' script which makes it very easy to compare benchmarks. For example to compare the native STL to libc++ you would run: `$ compare_bench.py ./util_smartptr.native.out ./util_smartptr.libcxx.out` And the output would look like: RUNNING: ./util_smartptr.native.out Benchmark Time CPU Iterations ---------------------------------------------------------------- BM_SharedPtrCreateDestroy 62 ns 62 ns 10937500 BM_SharedPtrIncDecRef 31 ns 31 ns 23972603 BM_WeakPtrIncDecRef 28 ns 28 ns 23648649 RUNNING: ./util_smartptr.libcxx.out Benchmark Time CPU Iterations ---------------------------------------------------------------- BM_SharedPtrCreateDestroy 46 ns 46 ns 14957265 BM_SharedPtrIncDecRef 31 ns 31 ns 22435897 BM_WeakPtrIncDecRef 34 ns 34 ns 21084337 Comparing ./util_smartptr.native.out to ./util_smartptr.libcxx.out Benchmark Time CPU ----------------------------------------------------- BM_SharedPtrCreateDestroy -0.26 -0.26 BM_SharedPtrIncDecRef +0.00 +0.00 BM_WeakPtrIncDecRef +0.21 +0.21 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@278147 91177308-0d34-0410-b5e6-96231b3b80d8
53 lines
1.1 KiB
C++
53 lines
1.1 KiB
C++
|
|
#include "benchmark/benchmark.h"
|
|
|
|
#include <cassert>
|
|
#include <memory>
|
|
|
|
class MyFixture : public ::benchmark::Fixture {
|
|
public:
|
|
void SetUp(const ::benchmark::State& state) {
|
|
if (state.thread_index == 0) {
|
|
assert(data.get() == nullptr);
|
|
data.reset(new int(42));
|
|
}
|
|
}
|
|
|
|
void TearDown(const ::benchmark::State& state) {
|
|
if (state.thread_index == 0) {
|
|
assert(data.get() != nullptr);
|
|
data.reset();
|
|
}
|
|
}
|
|
|
|
~MyFixture() {
|
|
assert(data == nullptr);
|
|
}
|
|
|
|
std::unique_ptr<int> data;
|
|
};
|
|
|
|
|
|
BENCHMARK_F(MyFixture, Foo)(benchmark::State& st) {
|
|
assert(data.get() != nullptr);
|
|
assert(*data == 42);
|
|
while (st.KeepRunning()) {
|
|
}
|
|
}
|
|
|
|
BENCHMARK_DEFINE_F(MyFixture, Bar)(benchmark::State& st) {
|
|
if (st.thread_index == 0) {
|
|
assert(data.get() != nullptr);
|
|
assert(*data == 42);
|
|
}
|
|
while (st.KeepRunning()) {
|
|
assert(data.get() != nullptr);
|
|
assert(*data == 42);
|
|
}
|
|
st.SetItemsProcessed(st.range(0));
|
|
}
|
|
BENCHMARK_REGISTER_F(MyFixture, Bar)->Arg(42);
|
|
BENCHMARK_REGISTER_F(MyFixture, Bar)->Arg(42)->ThreadPerCpu();
|
|
|
|
BENCHMARK_MAIN()
|