Peter, Thanks! This is a very good idea. I know that there are some virus scans and other processes running at night. I will do some monitoring to determine if paging is the problem. If it turns out to be so, is there anything I can do to force it to not page out the JVM heap?
Thanks again, -Bill Peter Crowther wrote: > >> From: Bill Clarke-Fields [mailto:[EMAIL PROTECTED] >> We are running an application on Tomcat 5.0.28 with Java >> 1.4.2. The usage >> of the application is very cyclical. It is used heavily >> during the day, and >> lightly at night. During peak daytime hours, a full garbage >> collection >> takes less than 2 seconds, which is fine. However, after a >> long period of >> inactivity in the evening, a full garbage collection will be >> triggered and >> take a very long time. Sometimes over a minute! > > I suspect the app is being paged out overnight by other jobs. Overnight > virus scans will do this on Windows, for example, as the disk cache > expands to fill available memory. > > You could test this by running Performance Monitor (Windows) or your > preferred logging tool (UNIX) overnight in log mode and looking for high > page-in and disk I/O values around the time of the full GC. For > preference, use the Process counters on Windows, as they'll tell you for > sure whether it's the Java process that's causing the paging traffic. > > - Peter > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > -- View this message in context: http://www.nabble.com/Very-Long-Full-GC-after-Inactivity-tf4589459.html#a13118297 Sent from the Tomcat - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
