I had to research it myself. -Xincgc is an Incremental Garbage Collector. If you have a multi CPU server there are better GC options. ----------- info I found from 2003 ------ -Xincgc The incremental garbage collector, which is off by default, will eliminate occasional garbage-collection pauses during program execution. However, it can lead to a roughly 10% decrease in overall GC performance. ------------
On multi-CPU/Core server I usually use parallel GC. It's setup like this. The interval values calculate out to 10 minutes. You will need to adjust this to suite the server and application needs. -XX:+UseParallelGC -Dsun.rmi.dgc.client.gcInterval=600000 -Dsun.rmi.dgc.server.gcInterval=600000 If you need to know more detail about what the GC is doing then enable GC verbose output and logging. That is done by adding these arguments to the JVM line. -Xloggc takes a full path to a log file. -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -verbose:gc -Xloggc:GarbageCollection.log This page is archived at Sun and is a good resource to help understand the GC log output. http://java.sun.com/docs/hotspot/gc1.4.2/example.html I have a guide to JVM tuning at my blog - It's a guide as in general road map, the values specified worked on my servers and may or may work on yours. But it will give you an idea of what and where to look. http://www.trunkful.com/index.cfm/2008/11/25/How-to-Tune-the-JVM-Part-2 As for the reason the service stops at 3am? Not sure, does it always do this at the same time? If so look for a scheduled task somewhere. Look in the web server logs. There could be something outside hitting the site (think bot) hard the same time everyday. Hope some of this helps, Wil Genovese Sr. Web Application Developer/ Systems Administrator CF Webtools www.cfwebtools.com [email protected] www.trunkful.com On Mar 22, 2011, at 10:27 AM, Mark A. Kruger wrote: >> Xincgc ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Order the Adobe Coldfusion Anthology now! http://www.amazon.com/Adobe-Coldfusion-Anthology/dp/1430272155/?tag=houseoffusion Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:343202 Subscription: http://www.houseoffusion.com/groups/cf-talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/groups/cf-talk/unsubscribe.cfm
