async-profiler

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

async-profiler can trace the following kinds of events:

• CPU cycles
• Hardware and Software performance counters like cache misses, branch misses, page faults, context switches etc.
• Allocations in Java Heap
• Contented lock attempts, including both Java object monitors and ReentrantLocks

Usage

See our Wiki or 3 hours playlist to learn about all set of features.

Download

Latest release (1.8.3):

• Linux x64 (glibc): async-profiler-1.8.3-linux-x64.tar.gz
• Linux x86 (glibc): async-profiler-1.8.3-linux-x86.tar.gz
• Linux x64 (musl): async-profiler-1.8.3-linux-musl-x64.tar.gz
• Linux ARM: async-profiler-1.8.3-linux-arm.tar.gz
• Linux AArch64: async-profiler-1.8.3-linux-aarch64.tar.gz
• macOS x64: async-profiler-1.8.3-macos-x64.tar.gz

Early access (2.0-b1):

• Linux x64 (glibc): async-profiler-2.0-b1-linux-x64.tar.gz
• macOS x64: async-profiler-2.0-b1-macos-x64.tar.gz

Previous releases

Supported platforms

• Linux / x64 / x86 / ARM / AArch64
• macOS / x64

Note: macOS profiling is limited to user space code only.

Building

Make sure the JAVA_HOME environment variable points to your JDK installation, and then run make. GCC is required. After building, the profiler agent binary will be in the build subdirectory. Additionally, a small application jattach that can load the agent into the target process will also be compiled to the build subdirectory.