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elixir-performance-review

Reviews Elixir code for performance issues including GenServer bottlenecks, memory usage, and concurrency patterns. Use when reviewing high-throughput code or investigating performance issues.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

설치 방법 보기

포함된 파일(5)

  • SKILL.md3.2 KB
  • references/concurrency.md2.6 KB
  • references/ets-patterns.md2.5 KB
  • references/genserver-bottlenecks.md3.0 KB
  • references/memory.md2.5 KB

SKILL.md(원문)

설치하기 전에 에이전트에게 전달되는 지시 내용을 확인할 수 있습니다.

Elixir Performance Review

Quick Reference

Issue TypeReference
Mailbox overflow, blocking callsreferences/genserver-bottlenecks.md
When to use ETS, read/write concurrencyreferences/ets-patterns.md
Binary handling, large messagesreferences/memory.md
Task patterns, flow controlreferences/concurrency.md

Review Checklist

GenServer

  • Not a single-process bottleneck for all requests
  • No blocking operations in handle_call/cast
  • Proper timeout configuration
  • Consider ETS for read-heavy state

Memory

  • Large binaries not copied between processes
  • Streams used for large data transformations
  • No unbounded data accumulation

Concurrency

  • Task.Supervisor for dynamic tasks (not raw Task.async)
  • No unbounded process spawning
  • Proper backpressure for message producers

Database

  • Preloading to avoid N+1 queries
  • Pagination for large result sets
  • Indexes for frequent queries

Valid Patterns (Do NOT Flag)

  • Single GenServer for low-throughput - Not all state needs horizontal scaling
  • Synchronous calls for critical paths - Consistency may require it
  • In-memory state without ETS - ETS has overhead for small state
  • Enum over Stream for small collections - Stream overhead not worth it

Context-Sensitive Rules

IssueFlag ONLY IF
GenServer bottleneckHandles > 1000 req/sec OR blocking I/O in callbacks
Use streamsProcessing > 10k items OR reading large files
Use ETSRead:write ratio > 10:1 AND concurrent access

Gates — before reporting

Do these in order for the performance review. Do not publish findings until each step passes.

  1. Protocol loaded — Read review-verification-protocol and apply its checks for each finding (hot paths, concurrency, resource use). Pass: For every substantive finding, you can name which protocol subsection you satisfied or state N/A with reason (e.g. pure reference to this skill’s Valid Patterns).
  2. Anchored evidence — Pass: Each finding includes a concrete locator: path:line (or line range), or Module.function/arity plus a short quoted snippet from the file.
  3. Performance claims — For anything under Context-Sensitive Rules, or any claim of bottleneck, N+1, unbounded growth, or heavy memory/binary cost, Pass: You state the observed or measured fact that meets “Flag ONLY IF” (e.g. rate, item count, ratio), or attach an artifact (profiler output, SQL/log excerpt, grep/search scope)—otherwise downgrade to question / suspected with what was not verified.

Before Submitting Findings

Complete Gates — before reporting (section above) first; the verification protocol is mandatory input to those gates.

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