We use a combination of micro and macro benchmarks for performance testing workerd.

Building benchmarks

Benchmarks should be built using --config=benchmark configuration, which builds a release binary with additional debug info.

To obtain most consistent results it is recommended to disable CPU frequency scaling (use "performance" governor https://wiki.debian.org/CpuFrequencyScaling)

Micro benchmarks

Micro benchmarks are defined using wd_cc_benchmark bazel macro. Use bazel run --config=benchmark on a defined target to obtain benchmarking results.

See example in bench-json.c++