Debugging and profiling jvm applications

Transcript

1. Debugging JVM Applications
2. What we’ll learn? JVM Heap Structure - Memory management Allocation difference - Java vs C/C++ Analysing workload - Heap differentiation Tools to understand what’s going on under the hood Demo - Sample applications
4. Types of GC collectors Serial Collector Parallel Garbage Collector CMS Garbage Collector G1 Garbage Collector - New guy on the block
5. Hotspot heap structure
7. Sample GC
8. Command line tools ps -eLo pid,lwp,nlwp,ruser,pcpu,stime,etime,args | grep {pid} htop Sar - historical system statistics iperf - network load testing tool
9. Jstat
10. Jvmtop - method profiling
11. Jvmtop - thread profiling
12. Sjk Plus - Java swiss knife jps - more detailed process information than default hh - print heap histogram ssa - super dense heap dump stcap - analyse dense heap dump (print vs histo)
14. jconsole - jmx playground
15. dstat - monitoring swiss knife
16. VisualVm
17. VisualVm - thread profiling
18. VisualGC
19. Demo Normal new gen demo Normal new+oldgen demo OOM demo Sample with locking Demo of deadlock
20. Thank you!