# chewiebug/GCViewer

Fork of tagtraum industries' GCViewer. Tagtraum stopped development in 2008, I aim to improve support for Sun's / Oracle's java 1.6+ garbage collector logs (including G1 collector)

Repository: https://github.com/chewiebug/GCViewer
Canonical: https://ross.abutalabs.com/products/gcviewer
Homepage: https://github.com/chewiebug/GCViewer/wiki
Language: Java
License: NOASSERTION
License Family: other
Last push: 2026-06-20T16:23:39+00:00

## Health v2 (maintenance only)
Score: 78/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 88, release rhythm 53, longevity 100
- inputs: {"age_days": 5428, "days_push": 74, "days_rel": 100, "gap_med": null, "n_releases_24m": 1}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4645, forks 992 (observed 2026-08-28T04:08:55.542046+00:00)

## What it is
GCViewer is a Java-based tool that visualizes and summarizes verbose garbage collection logs from Sun/Oracle, IBM, HP, and BEA JVMs, including modern G1 and unified logging formats. It offers both a Swing GUI and a command-line mode that produces CSV summaries and chart images.

## Use cases
- analyze java garbage collection logs
- visualize gc pause times and heap usage
- generate a csv summary from gc.log
- tune jvm garbage collector performance
- parse g1 collector logs
- chart gc activity from rotated log files

## When to choose
- you need to diagnose GC pauses or memory pressure in a JVM application
- you want a free, offline tool to parse verbose:gc or -Xlog:gc output
- you need command-line GC log reports for automation

## When to avoid
- you need real-time GC monitoring or alerting in production
- you use a JVM or logging format not listed as supported
- you want a modern web-based APM solution

## Facets
- artifact type: application
- maturity: active
- function: data-visualization, monitoring, parser, cli, gui
- domain: developer-tools, performance, monitoring
- platform: cross-platform, jvm, cli
- tags: garbage-collection, jvm, gc-logs, java, log-analysis, g1-collector, desktop

## Member repositories
- chewiebug/GCViewer (main) score 78

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:55.542046+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 2026-08-29T18:19:32.057816+00:00, confidence not recorded.
  - readme: https://github.com/chewiebug/GCViewer (fetched 2026-08-28T04:08:55.542046+00:00, sha cae4acf03332)
  - homepage: https://github.com/chewiebug/GCViewer/wiki (fetched 2026-08-29T09:04:05.815111+00:00, sha 80775ed017e2)
- Data as of 2026-08-30T08:39:29.467469+00:00.