JVM job for Tomcat taking lots and lots of CPU -- JAVA400-L

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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's Tomcat 7.0.67, running on an AS/400, in a 64-bit Java 7 JVM, with -Xms3096m and -Xmx5120m JVM arguments.

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

It seems to be doing a lot of garbage-collecting.

Would switching to Java 8 help? Would switching to 7.0.93 help?

--
James H. H. Lampert

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