Performance Troubleshooting Tools

This repository contains some tools to troubleshoot Java related performance issues.

The tools are basically shell scripts (compatible with Bash 4.x).

All commands support -h option to show the usage of the commands

Following are the tools available

• top-threads
• jstack-profiler
• analyze-jstack-samples

Please see the Wiki pages for more details about these tools.

top-threads

Show top CPU consuming threads in a Java process.

This tool uses ps command to get the CPU usage of individual threads

jstack-profiler

Naive Java Profiler, which uses the jstack command to take thread dump samples in specified intervals.

All thread dumps will be saved in a single directory.

This tool also saves the ps command output, which has the CPU usage for each thread.

analyze-jstack-samples

This tool analyzes the jstack thread dump samples taken from jstack-profiler tool.

There are two reports.

1. Stack Samples Count by Thread State (Default report)
2. Average CPU Usage of Threads (using both thread dump and ps output)

The first report also supports detecting Java level deadlocks.