JIT Performance with a Simpler Benchmark

You may remember that Rails Simpler Bench currently uses “hello, world”-type very simple routes that just return a static string. That’s probably the best possible Rails use case for JIT. I’m starting with no concurrency, just a single request at once. That doesn’t show JIT’s full speedup, but it’s the most accurate and more reproducible to measure… And mostly, we want to know if JIT speeds things up at all rather than showing the largest possible speedup. I’m also measuring in both Rails and plain Rack, with Puma, on a dedicated-tenancy AWS EC2 m4.2xlarge instance. There’s no networking happening outside the instance itself, so this should give us nice low-noise results.