2010/1/11 Carl <c...@etrak-plus.com>: > This is a new server, a Dell T110 with a Xeon 3440 processor and 4GB memory. > I have turned off both the turbo mode and hyperthreading. > > The environment: > > 64 bit Slackware Linux > > java version "1.6.0_17" > Java(TM) SE Runtime Environment (build 1.6.0_17-b04) > Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01, mixed mode) > > Tomcat: apache-tomcat-6.0.20 > > JAVA_OPTS="-Xms2400m -Xmx2400m -XX:PermSize=512m -XX:MaxPermSize=512m" > > I have watched observed the memory usage and general performance with Java > VisualVM and have seen nothing strange. GC seems to be performing well and > the memory rarely gets anywhere near the max. > > The server runs well, idling along at 2-5% load, serving jsp's, etc. at a > reasonable speed. Without warning and with no tracks in any log (Tomcat or > system) or to the console, the JVM will just go away, disappear. Sometimes, > the system will run for a week, sometimes for only several hours. Initially, > I thought the problem was the turbo or hyperthreading but, no, the problem > persists. > > When the JVM goes away, the memory that it held is still being held (as seen > from top) but it is nowhere near the machine physical memory. > > The application has been running on an older server (Dell 600SC, 32 bit > Slackware, 2GB memory) for several years and, while the application will > throw exceptions now and then, it never crashed the JVM. This leads me to > believe the problem has something to do with the 64 bit JVM but, with errors, > I can't be certain and don't know what I can do about it except go back to 32 > bit. > > I plan to reinstall Java tonight but, it would seem if the JVM were > corrupted, it simply would not run. > > Any ideas are welcome.
I'm with Andy: the Linux OOM killer would show those symptoms. With those settings, you're not leaving a lot of memory for the OS. How much swap do you have, and does the same thing happen if you reduce the Java heap and permgen space? - Peter --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
