We've found that setting the min and max to the same size works best. This prevents the issues caused by the JVM needing to auto scale in size while under load.
We also set the min and max perm size to be the same as each other. Also, how long have you set your gc intervals? if you do not have settings that look like this: -Dsun.rmi.dgc.client.gcInterval=600000 -Dsun.rmi.dgc.server.gcInterval=600000 Then your using the JVM default of every minute. This can lead to problems as well. The number above is set for 10 minutes (in milliseconds). You also need to take care your running the correct GC for your server environment. That can be complex, but typically use - XX:+UseParallelGC for multi cpu/core environments. This info is based on our HA environment of 2.5 to 3 million CF page views per day. And you don't want to see our DB server clusters loads or our monthly bandwidth usage. 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 Jul 30, 2009, at 4:37 PM, Michael Dinowitz wrote: > > I have it tuned: > min heap 512 > max heap 1024 > > permsize: 128 > maxpermsize 512 > > Like I said, LOTS of traffic and a lot of cached txt files being > included into a forums thread using GetPageContext().include(). > Everything was going well till recently (a month or so). I just > noticed the 20 minute GC today. Normally I get bigger memory spikes > but now it's small and steady. Worry's me a bit. > > I'm going to look over both sites for references. I know that Mike has > taked about setting the min heap to the max heap size in the past, but > I've avoided doing that so far. > > On Thu, Jul 30, 2009 at 4:54 PM, Wil Genovese<jugg...@visi.com> wrote: >> >> Michael, >> >> That is not normal. Sounds like you need some JVM tuning. >> >> I wrote a fairly decent blog piece on JVM tuning (http://www.trunkful.com >> ). Also Mike Brunt has some wonderful posts and expience with >> this. http://www.cfwhisperer.com >> >> >> >> >> 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 Jul 30, 2009, at 2:41 PM, Michael Dinowitz wrote: >> >>> >>> I've been seeing server problems every now and again where the CF >>> server reboots due to memory issues. I've been monitoring it and >>> while >>> the monitor is on it looks like I have garbage collection happening >>> every 20 minutes. Does this sound normal? For a heavily hit sight, >>> what would be expected or optimal for garbage collection? >>> >>> Thanks >>> >>> -- >>> Michael Dinowitz (http://www.linkedin.com/in/mdinowitz) >>> President: House of Fusion (http://www.houseoffusion.com) >>> Publisher: Fusion Authority (http://www.fusionauthority.com) >>> Adobe Community Expert / Advanced Certified ColdFusion Professional >>> Si, soy el senor "chico malo" para todos >>> >>> >> >> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Want to reach the ColdFusion community with something they want? Let them know on the House of Fusion mailing lists Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:325133 Subscription: http://www.houseoffusion.com/groups/cf-talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
