Awesome

Async-profiler

This project is a low overhead sampling profiler for Java that does not suffer from the Safepoint bias problem. It features HotSpot-specific API to collect stack traces and to track memory allocations. The profiler works with OpenJDK and other Java runtimes based on the HotSpot JVM.

Unlike traditional Java profilers, async-profiler monitors non-Java threads (e.g., GC and JIT compiler threads) and shows native and kernel frames in stack traces.

What can be profiled:

• CPU time
• Allocations in Java Heap
• Native memory allocations and leaks
• Contended locks
• Hardware and software performance counters like cache misses, page faults, context switches
• and more.

See our 3 hours playlist to learn about more features.

Download

Current release (3.0):

• Linux x64: async-profiler-3.0-linux-x64.tar.gz

• Linux arm64: async-profiler-3.0-linux-arm64.tar.gz

• macOS x64/arm64: async-profiler-3.0-macos.zip

• Converters between profile formats: converter.jar

  From	html	collapsed	pprof	pb.gz
  collapsed	✅	✅	❌	❌
  html	✅	✅	❌	❌
  jfr	✅	✅	✅	✅

Previous releases

Nightly releases (published on each commit to master)

For the build corresponding to a previous commit, go to Nightly Builds, click the desired build and scroll down to the artifacts section. These binaries are kept for 30 days.

Supported platforms

Quick start

In a typical use case, profiling a Java application is just a matter of a running asprof with a PID of a running Java process.

$ asprof -d 30 -f /tmp/flamegraph.html <PID>

The above command translates to: run profiler for 30 seconds and save results to /tmp/flamegraph.html as an interactive Flame Graph that can be viewed in a browser.

Build status

Documentation

Basic usage

• Getting Started
• Profiler Options
• Profiling Modes
• Integrating async-profiler
• Profiling In Container

Profiler output

• Output Formats
• FlameGraph Interpretation
• JFR Visualization
• Converter Usage

Advanced usage

• CPU Sampling Engines
• Stack Walking Modes
• Advanced Stacktrace Features
• Profiling Non-Java Applications

Troubleshooting

For known issues faced while running async-profiler and their detailed troubleshooting, please refer here.