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base on Sampling CPU and HEAP profiler for Java featuring AsyncGetCallTrace + perf_events # Async-profiler
This project is a low overhead sampling profiler for Java
that does not suffer from the [Safepoint bias problem](http://psy-lob-saw.blogspot.ru/2016/02/why-most-sampling-java-profilers-are.html).
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](docs/ProfilingModes.md).
See our [3 hours playlist](https://www.youtube.com/playlist?list=PLNCLTEx3B8h4Yo_WvKWdLvI9mj1XpTKBr)
to learn about more features.
# Download
Current release (3.0):
- Linux x64: [async-profiler-3.0-linux-x64.tar.gz](https://github.com/async-profiler/async-profiler/releases/download/v3.0/async-profiler-3.0-linux-x64.tar.gz)
- Linux arm64: [async-profiler-3.0-linux-arm64.tar.gz](https://github.com/async-profiler/async-profiler/releases/download/v3.0/async-profiler-3.0-linux-arm64.tar.gz)
- macOS x64/arm64: [async-profiler-3.0-macos.zip](https://github.com/async-profiler/async-profiler/releases/download/v3.0/async-profiler-3.0-macos.zip)
- Converters between profile formats: [converter.jar](https://github.com/async-profiler/async-profiler/releases/download/v3.0/converter.jar)
| From | html | collapsed | pprof | pb.gz |
| --------- | ---- | --------- | ----- | ----- |
| collapsed | ✅ | ✅ | ❌ | ❌ |
| html | ✅ | ✅ | ❌ | ❌ |
| jfr | ✅ | ✅ | ✅ | ✅ |
[Previous releases](https://github.com/async-profiler/async-profiler/releases)
[Nightly releases](https://github.com/async-profiler/async-profiler/releases/tag/nightly) (published on each commit to master)
For the build corresponding to a previous commit, go to
[Nightly Builds](https://github.com/async-profiler/async-profiler/actions/workflows/test-and-publish-nightly.yml),
click the desired build and scroll down to the artifacts section. These binaries are kept for 30 days.
# Supported platforms
| | Officially maintained builds | Other available ports |
| --------- | ---------------------------- | ----------------------------------------- |
| **Linux** | x64, arm64 | x86, arm32, ppc64le, riscv64, loongarch64 |
| **macOS** | x64, arm64 | |
# 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.
[](https://htmlpreview.github.io/?https://github.com/async-profiler/async-profiler/blob/master/.assets/html/flamegraph.html)
## Build status
[](https://github.com/async-profiler/async-profiler/actions/workflows/test-and-publish-nightly.yml)
# Documentation
## Basic usage
- [Getting Started](docs/GettingStarted.md)
- [Profiler Options](docs/ProfilerOptions.md)
- [Profiling Modes](docs/ProfilingModes.md)
- [Integrating async-profiler](docs/IntegratingAsyncProfiler.md)
- [Profiling In Container](docs/ProfilingInContainer.md)
## Profiler output
- [Output Formats](docs/OutputFormats.md)
- [FlameGraph Interpretation](docs/FlamegraphInterpretation.md)
- [JFR Visualization](docs/JfrVisualization.md)
- [Converter Usage](docs/ConverterUsage.md)
## Advanced usage
- [CPU Sampling Engines](docs/CpuSamplingEngines.md)
- [Stack Walking Modes](docs/StackWalkingModes.md)
- [Advanced Stacktrace Features](docs/AdvancedStacktraceFeatures.md)
- [Profiling Non-Java Applications](docs/ProfilingNonJavaApplications.md)
## Troubleshooting
For known issues faced while running async-profiler and their detailed troubleshooting,
please refer [here](docs/Troubleshooting.md).
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