I assume $GB means 4GB :) With that kind of memory use it doesn't sound entirely like the OOM killer. Have you looked around the filesystem for hs_err[pid].pid files? This usually is written to the cwd of the java process. That might give you ideas if it's a native crash. If so, it'll have the java stack, and other native information that might shed some light.
Otherwise, if the Tomcat JVM isn't running as a daemon, is it nohup'ed? Andy On 01/11/2010 05:33 PM, Carl wrote: > Peter and Andy, > > Thanks for your quick responses. > > Memory: Physical - $GB > Used - 2.4GB to 3.0 GB (according to top... have never > seen it above 3GB) > Swap - 19GB, none ever used (or, at least I have never > seen any used.) > > The above are all from top. > > The 2.4GB is after the JVM just crashed (after running less than an > hour after having run for five days with nary a blip) and I just > restarted Tomcat (customers are running right now) so it is a little > higher than normal because it has perhaps .5GB+ unrecovered from the > point at which the JVM crashed. > > I checked dmsg but saw nothing that looked out of the ordinary. > > I will cut back on the heap and permgen tonight (gonna be a long one.) > > Any ideas are welcome. > > Thanks, > > Carl > > > ----- Original Message ----- From: "Peter Crowther" > <peter.crowt...@melandra.com> > To: "Tomcat Users List" <users@tomcat.apache.org> > Sent: Monday, January 11, 2010 6:06 PM > Subject: Re: JVM goes away > > > 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 > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
