# grosser/parallel

Ruby: parallel processing made simple and fast

Repository: https://github.com/grosser/parallel
Canonical: https://ross.abutalabs.com/products/parallel
Language: Ruby
License: MIT
License Family: permissive
Last push: 2026-05-15T22:00:59+00:00

## Health v2 (maintenance only)
Score: 69/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 82, release rhythm 35, longevity 100
- inputs: {"age_days": 6231, "days_push": 110, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4264, forks 265 (observed 2026-08-28T04:08:40.674466+00:00)

## What it is
A Ruby gem that makes parallel processing simple, supporting parallel map/each/flat_map over processes, threads, or Ractors. It is best suited for map-reduce style workloads like parallel downloads, uploads, or CPU-bound computations.

## Use cases
- run expensive calculations across all CPU cores in ruby
- parallelize downloads or uploads in ruby
- process a large array with multiple worker processes
- speed up blocking IO operations with threads
- parallel iterate over ActiveRecord records
- use ruby ractors for parallel execution

## When to choose
- you need simple parallel map/each semantics in Ruby
- you want to choose between processes, threads, or Ractors with one API
- you need worker pools that grab the next item when free

## When to avoid
- you need distributed processing across multiple machines
- you need fine-grained async/concurrent primitives like futures or channels
- you rely on experimental Ractor stability for production-critical code

## Facets
- artifact type: library
- maturity: stable
- function: concurrency
- domain: developer-tools, performance
- platform: ruby
- tags: parallel-processing, map-reduce, threads, processes, ractors, gem, algorithms

## Member repositories
- grosser/parallel (main) score 69

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:40.674466+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:22:03.981670+00:00, confidence not recorded.
  - readme: https://github.com/grosser/parallel (fetched 2026-08-28T04:08:40.674466+00:00, sha f9618816665b)
- Data as of 2026-08-30T08:39:29.467469+00:00.