Micronaut HTTP server benchmarks

The build system is described in this blog post.

Running

The benchmarks use h2load for load generation at the moment. You need to have it installed.
The benchmarks only work with Graal EE at the moment, for PGO and G1GC. A Graal CE comparison is planned but will be difficult without resolution of a gradle limitation. The Graal EE SDK must be on the PATH.
The dependencies are currently hardcoded for x86_64 linux and probably won't work on other platforms.
Run ./run-benchmarks.py --prepare-pgo. This will build the native image with --pgo-instrument, apply a test load, and save the generated PGO data.
Run ./run-benchmarks.py --verify-features. This will build the normal native images (requires PGO data generated above) and verify that the features are toggled as expected (e.g. the epoll-on builds actually have working epoll).
Run ./run-benchmarks.py to run the actual benchmarks. This will take a while.
Run ./plot.py to plot the benchmark results.