Performance

go-ruby-rubocop/rubocop is the pure-Go library that rbgo binds for Ruby's RuboCop core. This page records the methodology for a comparative benchmark of that module against the reference Ruby runtimes, part of the ecosystem-wide per-module parity suite.

What is measured

The same Ruby script — running the core cop set over a representative Ruby source and formatting the offenses — is run under every runtime. rbgo's number reflects this pure-Go library doing the work; every other column is that interpreter running the rubocop gem. So the comparison is the Ruby-visible operation, apples-to-apples across interpreters. The script prints a deterministic checksum of the offenses and its output is checked byte-identical to the gem before timing.

• Method: best-of-5 wall time (best, not mean, to suppress scheduler noise); single-shot processes, no warm-up beyond the script's own loop.
• Runtimes: MRI (the oracle) and MRI --yjit; jruby (OpenJDK); truffleruby (GraalVM CE Native).
• The benchmark script and harness live in rbgo's repo under bench/modules/ (rubocop.rb + run.sh). Reproduce: RBGO=./rbgo TRUFFLE=truffleruby bash bench/modules/run.sh 5.

Result

Measurement pending

Numbers for this module are not yet published. The methodology above is fixed, but the comparative table is deliberately left empty rather than filled with fabricated figures — in line with the ecosystem convention of publishing only real, reproducible measurements. Once the parity run has been executed on a pinned host, the best-of-5 wall times (and the vs gem ratios) will be recorded here.