JVM job for Tomcat taking lots and lots of CPU
"James H. H. Lampert" <jamesl-6/ELSmrcqeUu8xhjR5IN5AC/[email protected]>
| Newsgroups | gmane.comp.lang.as400.java |
|---|---|
| Message-ID | <[email protected]> |
Ladies and Gentlemen: We have a customer installation in which the JVM job for our Tomcat server is frequently using massive amounts of CPU. It is running in a subsystem with a private pool The private pool (5) is currently showing fewer page-faults in WRKSYSSTS than the base pool. > 1 3052.92 1789.92 +++++ .0 .0 .0 .0 > 2 47586.35 264.65 621 11.2 979.9 377.4 1224.3 > 3 649.51 .00 13 .0 .0 .0 .0 > 4 6495.19 .00 1215 .1 .8 .8 1.6 > 5 7168.00 2.32 500 .0 .0 3.3 6.2 GC information on the JVM job shows: > Garbage collected heap: > Initial heap size . . . . . . . . . : 3096.000M > Maximum heap size . . . . . . . . . : 5120.000M > Current heap size . . . . . . . . . : 4458.562M > Heap in use . . . . . . . . . . . . : 1907.673M > Other memory: > Internal (break) memory size . . . . : 504.982M > JIT memory size . . . . . . . . . . : 74.000M > Shared classes memory size . . . . . : 0.000M > General GC information: > Current GC cycle . . . . . . . . . . : 2184 > GC policy type . . . . . . . . . . . : GENCON > Current GC cycle time . . . . . . . : 552 > Accumulated GC time . . . . . . . . : 5108241 The job is currently running in Java 7, on a V7R3 box, with -Xms3096m and -Xmx5120m JVM arguments. Would switching to Java 8 help? What are the maximum meaningful -Xms and -Xmx values for Java 7 and Java 8, respectively? -- This is the Java Programming on and around the IBM i (JAVA400-L) mailing list To post a message email: [email protected] To subscribe, unsubscribe, or change list options, visit: https://lists.midrange.com/mailman/listinfo/java400-l or email: JAVA400-L-request-+hD5IHI5Xscn3HwCXmMcX9BPR1lH4CV8@public.gmane.org Before posting, please take a moment to review the archives at https://archive.midrange.com/java400-l. Help support midrange.com by shopping at amazon.com with our affiliate link: https://amazon.midrange.com