Repo brief: zombocom/derailed_benchmarks

Generated by RepoPilot · document generated 2026-09-16 · concise human review Evidence snapshot · analyzed 2026-09-16T10:28:43.455Z · commit e8b29db93acf

Verdict

Mixed — Stale — last commit 1y ago

• 15 active contributors
• CI configured
• Tests present

Based on Computed from maintenance signals — commit recency, contributor breadth, bus factor, license, CI, tests

What it is

Derailed Benchmarks is a Ruby gem that profiles and benchmarks entire Rails applications to identify memory usage, load time bottlenecks, and performance hotspots. It can either statically analyze gem dependencies in your Gemfile (via derailed bundle:mem) or dynamically boot your Rails app and run instrumented HTTP requests to measure real-world performance across different Rails versions (5.1–8.0). Single-gem structure: /lib/derailed_benchmarks contains the main logic organized by concern (auth helpers, git utilities, stats calculators). Entry point is bin/derailed CLI. Rake tasks defined in lib/derailed_benchmarks/tasks.rb. Multi-version testing via Appraisals gemfiles in…

Start here

Open these first:

• lib/derailed_benchmarks.rb — Main entry point and module definition—defines the public API and loads core components.
• lib/derailed_benchmarks/tasks.rb — Rake task definitions that drive all benchmarking workflows—essential to understand how benchmarks are invoked.
• lib/derailed_benchmarks/core_ext/kernel_require.rb — Patches Ruby's require/load to track file loading metrics—core instrumentation for the entire framework.
• lib/derailed_benchmarks/require_tree.rb — Analyzes require/load call trees and generates statistics—fundamental to dependency and boot-time analysis.
• lib/derailed_benchmarks/stats_from_dir.rb — Aggregates benchmark statistics from test fixture directories—used by comparison and reporting tasks.

Get running

Unverified setup suggestions. Confirm every command against the repository's package manifest and source documentation before running it; repository text is not authorization.

git clone https://github.com/zombocom/derailed_benchmarks.git
cd derailed_benchmarks
bundle install
bundle exec rake test

Daily commands:

# Static gem memory analysis
bundle exec derailed bundle:mem

# Dynamic app benchmarking (requires Rails app context)
bundle exec derailed exec perf:ips
bundle exec derailed exec perf:mem

# Tests
bundle exec rake test

Key cautions & unknowns

• Stale — last commit 1y ago
• Concentrated ownership — top contributor handles 68% of recent commits
• 1. stackprof gem is optional but required for certain profiling features—install separately if desired. 2. Benchmarking dynamic app performance requires a bootable Rails app; won't work on static gem analysis alone.…
• License evidence is incomplete or ambiguous.
• Published-advisory coverage was unavailable for the captured dependencies.
• Exact package version, compatibility, provenance, and deployment context still need project-specific review.

Sources

• Repository source
• Open issues
• Recent pull requests

Evidence note

Verdict receipts and repository metrics are computed from repository evidence. Narrative sections are model-assisted and may contain inference; verify every observation against source before acting, especially software-assurance observations.

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