# AdoptOpenJDK/jitwatch

Log analyser / visualiser for Java HotSpot JIT compiler. Inspect inlining decisions, hot methods, bytecode, and assembly. View results in the JavaFX user interface.

Repository: https://github.com/AdoptOpenJDK/jitwatch
Canonical: https://ross.abutalabs.com/products/jitwatch
Language: Java
License: NOASSERTION
License Family: other
Topics: jitwatch, java, javafx, hotspot-jit-compiler, hotspot, log-analyser, jit-compiler, escape-analysis
Last push: 2025-12-28T13:31:13+00:00

## Health v2 (maintenance only)
Score: 55/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 59, release rhythm 24, longevity 100
- inputs: {"age_days": 4720, "days_push": 248, "days_rel": 295, "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 3305, forks 463 (observed 2026-08-28T04:07:55.824163+00:00)

## What it is
JITWatch is a log analyser and visualiser for the Java HotSpot JIT compiler, built with a JavaFX user interface. It lets developers inspect inlining decisions, hot methods, bytecode, and generated assembly from JIT compilation logs.

## Use cases
- analyze hotspot jit compiler logs
- inspect method inlining decisions in java
- find hot methods in my java application
- view bytecode and assembly generated by the jit
- understand why the jit did not inline a method
- visualize escape analysis results
- tune java performance using jit logs

## When to choose
- you need to understand HotSpot JIT compilation behavior for performance tuning
- you want a GUI to explore inlining decisions, hot methods, and generated assembly
- you are profiling Java applications at the JIT level

## When to avoid
- you need general application profiling rather than JIT-specific analysis
- you work outside the JVM/HotSpot ecosystem
- you prefer command-line-only tooling without a JavaFX GUI

## Facets
- artifact type: application
- maturity: active
- function: monitoring, data-visualization, developer-tools
- domain: developer-tools, performance, compilers
- platform: jvm, cross-platform
- tags: jit-compiler, hotspot, javafx, log-analysis, performance-tuning, bytecode, assembly, desktop

## Member repositories
- AdoptOpenJDK/jitwatch (main) score 55

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:55.824163+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 2026-08-29T18:42:38.828682+00:00, confidence not recorded.
  - readme: https://github.com/AdoptOpenJDK/jitwatch (fetched 2026-08-28T04:07:55.824163+00:00, sha 3ddb2448ba91)
- Data as of 2026-08-30T08:39:29.467469+00:00.