Rick, Check networking as well. Momentary disruptions (like cards and ports resynching their rate and duplexing) could cause sympoms like this as well. I always check point to point to insure that the NIC on the server (db and web) and the ports on the switch are set "statically" to the optimum rate.
-Mark -----Original Message----- From: Rick Root [mailto:rick.r...@webworksllc.com] Sent: Thursday, February 05, 2009 6:15 PM To: cf-talk Subject: Re: JVM Tuning and Garbage Collection I've taken advice from several of you and restarted my services... so far so good. I lowed the memory on each instance to 768m - min and max - and added the garbage collection interval. I also increased the maxpermsize java.args=-server -Xmx768m -Xms768m -Dmail.host=www.classcreator.com -Dsun.io.useCanonCaches=false -Dsun.rmi.dgc.client.gcInterval=600000 -Dsun.rmi.dgc.server.gcInterval=600000 -XX:MaxPermSize=256m -XX:+UseConcMarkSweepGC -Dcoldfusion.rootDir={application.home}/ Oops.. I just noticed that I accidentally left the GC method to UseConcMarkSweepGC .. I didn't intend for that as I switched it to that last friday night, and monday when activity picked up I was in hell... switched back to UseParallelGC Tuesday morning, and things smoothed out considerably. So far, things are running pretty smoothly. Garbage collection does not seem to be causing any problems. I am still seeing these weird, rhythmic activity spikes where every 13-14 minutes, my request activity graph skyrockets to 20 active requests, while it usually hovers around 2-3 active requests (while processing anywhere from 5-10 requests per second) NEXT STEP: I'm going to upgrade from the JVM that shipped with CF 8 to the latest 1.6.0_12 At the same time as these request spikes, I see JDBC time spikes. A significant spike of requests could slow down the database server, so this makes sense to me. Alternatively, a temporary slowdown on the database server could also lead to a slowdown of request processing which would lead to the "piling up" of requests. HOWEVER, I haven't seen anything particularly unusual on the database server that would cause these rhythmic spikes in activity. No scheduled tasks running every 13 minutes, etc. I am having Cacti installed so we can better monitor CPU and disk activity on our servers so hopefully that will help me problem solve! Anyway, thanks all, I appreciate your input. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| 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:318971 Subscription: http://www.houseoffusion.com/groups/cf-talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
