Getting started

git clone --recursive --shallow-submodules https://github.com/seantalts/perf-math.git

First run

(unless you have the Google benchmark library installed)

cd benchmark
git clone --depth=1 https://github.com/google/googletest
mkdir build && cd build
cmake .. -DCMAKE_BUILD_TYPE=RELEASE
make

Writing a benchmark

There is an example, this matstuff.cpp. You can make your own or reuse this file. See https://github.com/google/benchmark for details.

Essential structure:

staticvoidBM_Name(benchmark::State& state) {
setup();
for (auto _ : state) {
thing_to_time();
}
}
BENCHMARK(BM_Name);
BENCHMARK_MAIN();

Making a benchmark

$ make matstuff && ./matstuff c++ -Imath/lib/eigen_3.3.3/ -Ibenchmark/include -std=c++1y -Imath/
-Imath/lib/boost_1.66.0 -Lbenchmark/build/src matstuff.cpp -lbenchmark -o
matstuff
2018-08-29 04:52:47
Running ./matstuff
Run on (4 X 2200 MHz CPU s)
CPU Caches:
L1 Data 32K (x2)
L1 Instruction 32K (x2)
L2 Unified 262K (x2)
L3 Unified 4194K (x1)
------------------------------------------------------
Benchmark Time CPU Iterations
------------------------------------------------------
BM_LogOrig 2688940713 ns 2669717000 ns 1
BM_LogProposed 2711084835 ns 2696761000 ns 1