javahighcpu

javahighcpu

Installation

npm install -g javahighcpu

Usage

Correlates top output with thread dumps. This tool was inspired from Java application high CPU and How do I identify high CPU utilization by Java threads on Linux/Solaris

The top output comes from: top -b -n 1 -H -p <pid> >> high-cpu.out

The thread dump output comes from jstack -1 <pid> >> high-cpu-tdumps.out

However it is generally recommended to generate this data from the script in the bin dir: bin/high_cpu_linux_jstack.sh <pid>

Usage Example

Attempt to correlate top output and thread dumps with a CPU threshold of 80%. This will output any threads that are engaging the CPU at 80%.

javahighcpu high-cpu.out high-cpu.tdump.out

Testing

npm test

Contributing

grunt dev
node lib/cli.js -t 10 test/examples/std/high-cpu.out test/examples/std/high-cpu-tdumps.out

Release process

gulp nodify
gg c <msg>
gg push
npm run test
npm run patch-release

The nodify is to remove the trailing ; in the top of cli.js. gg represents git goodies, it's just nice. The patch-release tags and publishes to npm.

License

The MIT License (MIT)

Copyright 2015 Samuel

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.