I am running a cluster JBoss servers.
Both server has 4 CPUs, dual cores. i.e. 8 logical CPUs.
I want to tune the JVM setting and I found that I can use the following parameters:
I did some load test with different number of ParallelGCThreads.
However, I was surprised from the load test result that, the Full GC time for the UseParallelOldGC is much longer than I didn't use it. E.g.
A) Parallel Old GC = 7
B) Parallel Old GC = 3
C) No Parallel Old GC
Does anyone know any reason why the Parallel GC can perform poor?