Parallel GC is a different GC algorithm that works best with multi- processors and large (Gb or greater) JVM heaps. We use parallel GC on our servers with zero issues and we're pushing darn near a million page views per day per server.
Those switches control the time interval between GC runs in seconds. Wil Genovese One man with courage makes a majority. -Andrew Jackson A fine is a tax for doing wrong. A tax is a fine for doing well. On May 29, 2008, at 2:32 PM, Michael Patti wrote: > Glad to hear I'm not totally off base with my settings. My server > has 4 GB physical memory. One thing I'm unsure about: you recommend > using '-XX:+UseParallelGC' for garbage collection. I've read a few > articles that recommended '-XX:+UseConcMarkSweepGC' (which is what > I'm using now). Why do you recommend ParallelGC? > > Also, I haven't seen references to the '- > Dsun.rmi.dgc.client.gcInterval' and '- > Dsun.rmi.dgc.server.gcInterval' switches before. What do those > affect? > >> Michael, >> >> So far pretty good. Most people I talk to about this haven't even >> heard about tuning their JVM. My article is not complete yet and >> your >> past the parts that I have posted. >> >> So here are a few items for your java.args line. Your setting >> maxpermsize and permsize. Good, but make them the same size. You >> also need to get garbage collection under control. The last three >> items will do that. This should get you going pretty smoothly. Also, >> how much physical memory does your server have? >> >> >> -XX:MaxPermSize=128m >> -XX:PermSize=128m >> -Dsun.rmi.dgc.client.gcInterval=600000 >> -Dsun.rmi.dgc.server.gcInterval=600000 >> -XX:+UseParallelGC >> >> >> Wil Genovese >> >> One man with courage makes a majority. >> -Andrew Jackson >> >> A fine is a tax for doing wrong. A tax is a fine for doing well. >> >> On May 29, 2008, at 1:54 PM, Michael Patti wrote: >> >>> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Adobe® ColdFusion® 8 software 8 is the most important and dramatic release to date Get the Free Trial http://ad.doubleclick.net/clk;192386516;25150098;k Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:306296 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4
