I think you need to review which type of garbage collection you have setup in Jrocket. After reading your post I was looking into JRocket and read following in one of their white papers where if you use JRocket Parallel garbage collection it will indeed pause the application to do garbage collection.
http://www.bea.com/content/news_events/white_papers/BEA_JRockit_wp.pdf >From page 6, below Adaptive Garbage collection: "Parallel garbage collection optimizes throughput by taking advantage of multi-CPU machines to speed up garbage collection. The application is paused temporarily while all the available CPUs are used by the garbage collector to quickly reclaim memory from "dead" (unreferenced) objects." You may want to setup Concurrent garbage collection. Regards, John Haigh -----Original Message----- From: Terry Ford [mailto:[EMAIL PROTECTED] Sent: Tuesday, May 15, 2007 10:05 PM To: CF-Linux Subject: CFMX on JRockit - infrequent but severe GC pauses? Hi CF linuxers, I've been running CFMX on Jrockit 1.4.2 for a long time now. It has always performed far better than the other JVMs for our applications. Only 1 crash in over 2 years. Current uptime of a few months. However, as our traffic has risen and the complexity of our apps has grown, we've started to notice a garbage collection problem. Short term garbage collection works great. There are almost no noticable pauses in everyday operation. The server handles 1000+ users at a time without much of a problem. However, once in a long time (every 12 hrs? 18 hrs? 24 hrs? something on that magnitude), the JVM becomes totally unresponsive for 2 or 3 minutes. It completely stops processing templates, and then returns to normal at the end of the 3 minutes. CFSTAT freezes, indicating nothing is going on. The DB server is processing no queries. I suspect that it is using this period of time to do some sort of major long-term garbage collection. This is a bit of a problem, since some of our applications are real-time sensitive and we really can't have these pauses. So I was wondering if anyone has any ideas on what may be causing these infrequent yet severe pauses. This server is dedicated to HTTP / CFMX6.1. DB is on a different server. Here is the status of our memory at steady state: total used free shared buffers cached Mem: 4130600 4114828 15772 0 7844 2141576 -/+ buffers/cache: 1965408 2165192 Swap: 1052248 304 1051944 Here are our JVM args: java.args=-server -DJINTEGRA_NATIVE_MODE -DJINTEGRA_PREFETCH_ENUMS -Xbootclasspath/a:{application.home}/lib/webchartsJava2D.jar -Dja va.awt.graphicsenv=com.gp.java2d.ExHeadlessGraphicsEnvironment -Xmx1000m -Xms1000m -Xgcprio:pausetime I think we could probably up that 1000 Xmx, but wouldnt that just make the garbage collection problem more severe? The "pausetime" param is described as "The pausetime priority should be used when the application depends on an even performance." Yet the pauses are still occurring. Thoughts on possible solutions would be much appreciated. Thanks. Terry ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Macromedia ColdFusion MX7 Upgrade to MX7 & experience time-saving features, more productivity. http://www.adobe.com/products/coldfusion?sdid=RVJW Archive: http://www.houseoffusion.com/groups/CF-Linux/message.cfm/messageid:4311 Subscription: http://www.houseoffusion.com/groups/CF-Linux/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.14
