Rick, We run very similar traffic. We found GC to be much better, for our app, when using the 1.5.0_14 JVM, over the default CF8 JVM. We hired Mike Brunt to come in and consult with us (some of the best money we ever spent). This may be better with the 1.6.0_11 JVM, but we haven't tested that yet.
Steve "Cutter" Blades Adobe Certified Professional Advanced Macromedia ColdFusion MX 7 Developer Co-Author of "Learning Ext JS" http://www.packtpub.com/learning-ext-js/book _____________________________ http://blog.cutterscrossing.com Rick Root wrote: > Dear cf-talk, > > I'm working on a site that averages about 10 requests per second over > the course of a 24 hour period... of course it's considerably more > active during peak time periods (actually about 9am-midnight, with > peak activity between 8 and 10pm. > > We spread this across 3 instances with 1gb of memory each. > > Time between major GCs right now is about 14 minutes. However during > the peak time, major GCs run about every 6 minutes. > > These garbage collections cause a temporary pause in the processing of > requets while memory is cleaned up, and when you're getting 8 requests > per second, they pile up quite rapidly. > > Right now I have Fusion Reactor configured to only allow 15 requests > into CF at a time and queue the rest.. but during these 15-20 seconds > of slow processing (every 6 minutes on each of the 3 instances), > unusual things happen like lock timeouts in the application.cfm. > > Now.. after a major garbage collection, memory usage drops from 1GB to 400MB. > > We're running windows server 2003 with 2 Xeon 3ghz CPUs and 4GB of RAM > .. coldfusion 8,0,1,195765, JVM 1.6.0_04 > > my JVM arguments: > > java.args=-server -Xmx1024m -Xms768m -Dmail.host=www.classcreator.com > -Dsun.io.useCanonCaches=false -XX:MaxPermSize=192m -XX:+UseParallelGC > -Dcoldfusion.rootDir={application.home}/ > > Here are my settings from the "Request Tuning" part of the CF Administrator: > > Maximum number of simultaneous Template requests 25 > Maximum number of simultaneous Flash Remoting requests 3 > Maximum number of simultaneous Web Service requests 3 > Maximum number of simultaneous CFC function requests 3 > Maximum number of running JRun threads 40 > Maximum number of queued JRun Threads 1000 > > And as I said... Fusion Reactor is configured to queue requests beyond > 15....and there are three instances (all with the same settings) > > so.. how can I reduce the negative effects of garbage collection on > the application? > > Any suggestions? > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Adobe® ColdFusion® 8 software 8 is the most important and dramatic release to date Get the Free Trial http://ad.doubleclick.net/clk;207172674;29440083;f Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:318932 Subscription: http://www.houseoffusion.com/groups/cf-talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
