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I bet you have a permgen leak in your application by Nikita Salnikov
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I bet you have a permgen leak in your application by Nikita Salnikov

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  • 1. I bet you have a memory leak Nikita Salnikov-Tarnovski @iNikem Saturday, June 29, 13
  • 2. Plumbr • We solve memory leaks ... for now • Giving you the exact location of the leak with enough information to fix it • The foundation is based on machine learning • Ongoing effort Saturday, June 29, 13
  • 3. Plumbr • trained on 1,000,000 memory snapshots • From 5,000 different applications • Finding 88% of the existing leaks. • 30,000 monthly unique visitors on our site • 500 monthly downloads • 2600+ leaks discovered Saturday, June 29, 13
  • 4. Memory leak • A situation where some objects are not used by application any more, but GC fails to recognize them as unused • The notion of “object is not used by application any more” is totally, absolutely, 100% application specific! http://plumbr.eu/blog/what-is-a-memory-leak Saturday, June 29, 13
  • 5. Classloader leak • The most common leak in web applications • If even 1 class is left behind, he keeps all his friends • After some redeploys, you crash Saturday, June 29, 13
  • 6. Should you care? • PermGen will die soon • Metaspace do not eliminate the problem • No redeploy, no problem • Yeah, but... Saturday, June 29, 13
  • 7. Boy scout rule Saturday, June 29, 13
  • 8. The problem is... • Most of the classloader leaks you will ever encounter are not your fault • Libraries • You have no idea what do you use in your application Saturday, June 29, 13
  • 9. Demo • Quite simple web application • CRUD with JPA, Spring, JSP, WebSockets • Running on Jetty Saturday, June 29, 13
  • 10. Solving performance problems is hard. We don’t think it needs to be. Saturday, June 29, 13