Visualising Gargage Collection using Visual VM
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The document outlines the steps and tools required for visualizing garbage collection (GC) in Java applications using Visual VM and its GC plugin. It aims to demonstrate the impact of different GC configurations on application performance rather than benchmarking. Various VM arguments for testing different GC behaviors are provided, along with links for further reading.
![VM ARGUMENTS TO TRY
▸ -Xmx<size>[m|g]
▸ -Xms<size>[m|g]
▸ -XX:NewSize=<size>[m|g]
▸ -XX:+UseSerialGC
▸ -XX:+UseParallelOldGC
▸ -XX:+UseConcMarkSweepGC
▸ -XX:+UseParallelGC -XX:+UseNUMA
▸ -XX:+UseG1GC](https://image.slidesharecdn.com/gc-160302091839/85/Visualising-Gargage-Collection-using-Visual-VM-7-320.jpg)
Visualising Gargage Collection using Visual VM
- 1. VISUALISING GARBAGE COLLECTION USING VISUAL VM LUIZ TESTON, WWW.FRACTA.CC
- 3. MANDATORY ITEMS TO REPRODUCE THE STEPS ON THE GC WORKSHOP ▸ JDK >= 1.5 ▸ Visual VM + Visual GC plugin ▸ Jetty (or any other Java application to measure) ▸ Apache Bench “ab” or any other stress application ▸ credentials: cam20jan16 / AJtmN5d3
- 4. DISCLAIMER ▸ The objective is to visualise different GC configurations and how they affect the application execution and the GC behaviour itself. ▸ The stress tools are here just to help objects being created and destroyed by the application. ▸ We are not benchmarking jetty. ▸ We are not benchmarking http. ▸ We are not benchmarking at all.
- 6. RUN YOUR APP STRESS IT VISUALISE IT
- 7. VM ARGUMENTS TO TRY ▸ -Xmx<size>[m|g] ▸ -Xms<size>[m|g] ▸ -XX:NewSize=<size>[m|g] ▸ -XX:+UseSerialGC ▸ -XX:+UseParallelOldGC ▸ -XX:+UseConcMarkSweepGC ▸ -XX:+UseParallelGC -XX:+UseNUMA ▸ -XX:+UseG1GC
- 8. SCREENSHOTS
- 9. <no args>
- 10. -Xmx2G -Xms2G
- 11. -Xmx7G -Xms7G
- 13. -Xmx1G -Xms1G -XX:NewSize=800m -XX:+UseSerialGC
- 16. -Xmx1G -Xms1G -XX:+UseParallelGC -XX:+UseNUMA
- 18. QUESTIONS? THANKS FOR YOUR TIME! ▸ http://docs.oracle.com/javase/8/docs/technotes/guides/ vm/gctuning/index.html ▸ mechanical-sympathy.blogspot.com/2013/07/java- garbage-collection-distilled.html ▸ https://visualvm.java.net ▸ fotos: Dani Teston