> What is the default setting for the -XX:ParallelGCThreads and what
> increments should I try increasing these?
Look at section 4.1 and 4.2 of http://www.petefreitag.com/articles/gctuning/
"By default the throughput collector uses the number of CPU's as its value for number of GC threads."
I would increment by 1's, keeping in mind that you may cause more overhead than your saving by increasing this value. I probably wouldn't go much past 2x number of CPU's
______________________________________
Pete Freitag
http://www.cfdev.com/
Author of the CFMX Developers Cookbook
http://www.petefreitag.com/bookshelf/
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