On Tue, Jan 26, 2010 at 4:50 PM, Jesse Klaasse <jesse.klaa...@indicia.nl> wrote: > > Hi Chuck, thanks for your extensive comments about the JVM options.. >
On a site note... I have made the observation that the JVM is performing best without any explicit gc settings. Most time explicit GC settings just cause havoc (fixes sized generation spaces lead to 100% cpu usage and continuous full gcs, some performance options are extremely vm version specific and so on). Among the sites of my customers, one site is serving more than 500 requests per second in a single tomcat with only following options: -Xmx16G -Xms16G -XX:MaxPermSize=512M -XX:+PrintGCDetails -XX:+PrintGCTimeStamps Another customer of mine was playing with gc settings for nearly a year, because his tomcats collection times went higher and higher, and after a short look at the heap dump with jmap and jhat, we found out that he had 100.000.000 uncollectable garbage objects in the heap (2/3 of his heap actually). Instead of investigating his heap pollution he spent 11 month playing with gc options to setup a faster gc. In the end the problem was solved in two days. Most time I've seen people playing with gc settings, nothing good came out of it, save for real experts like Chuck. Thats just a side note ;-) regards Leon --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
