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sebyx07sebyx07/ruby2html/.claude/skills/benchmark/SKILL.md

benchmark

Skill23 starsChanged 12 days agoMITView on GitHub

Measure ruby2html rendering performance and compare before/after a change (C extension, pure-Ruby twin, render.rb, template handler, components). Use when a change claims or may affect speed, or when the user asks to benchmark, profile or compare against ERB/Slim/Phlex/ViewComponent.

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SKILL.md

Benchmark ruby2html (before/after)

Project rule: speed over memory. Perf claims need numbers from the same machine, Ruby and YJIT state.

Tools

CommandMeasures
bundle exec rake benchcompiles, runs every bench/*.rb
bundle exec ruby bench/render_bench.rbfull page render vs Phlex / Erubi, plus allocations per render
bundle exec ruby bench/tag_bench.rbper-tag cost for common call shapes
bundle exec ruby bench/escape_bench.rbescaping throughput, clean/dirty, short/long
bundle exec rspec spec/benchmarks/request-level through the demo app: ERB, Slim, .html.rb, ViewComponent, Phlex (10 s warmup + 60 s each, ~6 min; skipped when CI is set)

Variants: --yjit (or RUBY_YJIT_ENABLE=1), RUBY2HTML_DISABLE_EXT=1 (pure Ruby), BENCH_TIME=5 (seconds per ips run, render_bench), RUBY2HTML_NO_SIMD=1 bundle exec rake compile (scalar escape path; recompile normally afterwards). Read each script's header for its options.

Procedure

  1. Record environment: ruby -v (shows +YJIT), uname -m, which variant flags were used.
  2. Baseline on the base revision: git worktree add "$SCRATCH/r2h-base" <rev> (or git stash), bundle exec rake compile there, run the chosen command, save output to the scratch dir.
  3. Candidate: back on the change, bundle exec rake compile (mandatory after ext/ edits), identical command, save output.
  4. Repeat each side at least twice if the delta is < 10%; overlapping benchmark-ips error bars = "no measurable change". Check allocation counts (render_bench) for regressions too.
  5. Correctness: CI=1 bundle exec rspec.
  6. Report a table: benchmark, before, after, ratio, error; environment line. Never round away regressions. Remove the worktree (git worktree remove).

README tables are updated only when the maintainer asks, with the environment line.

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