ParallelOldGC vs ParallelGC

mbien at fh-landshut.de mbien at fh-landshut.de
Tue Dec 16 01:28:45 PST 2008


Hello everyone,

is there still a difference between both flags? In all my tests on jdk  
5 the VM was initialized each time with identical gc setups.

flags:
-server -XX:+UseParallelOldGC -verbose:gc -XX:+PrintGCDetails  
-XX:+PrintGCTimeStamps

-server -XX:+UseParalleldGC -verbose:gc -XX:+PrintGCDetails  
-XX:+PrintGCTimeStamps

jconsol reported in both cases PS MarkSweep and PS Scavange  
collectors. (what does PS mean?)

i always thought that ParallelGC would result in
parallel young + serial old
and ParrallelOldGC in
parrallel young + parralel old gcs

best regards,

michael

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