On 2/27/12 5:32 PM, "Carl Kabbe" <c...@etrak-plus.com> wrote:
>I have run Tomcat in two environments and both produced the same results. > >Server 1: > >OS - Slackware Linux 13.x 64 bit >JVM - 1.6.0_31 >Tomcat - 6.0.24 > >Server memory 16GB >Heap 2GB, PermGen 300M > >Server 2: > >OS - Slackware 13.x 64 bit >JVM - 1.6.0_31 >Tomcat - 7.0.14 > >Server memory 8GB >Heap 2GB, PermGen 300M > >The history: > >Two years ago, I was running the application on JVM 1.6.0_18 and having a >similar or the same problem and Charles suggested I go back to 1.6.0_7. >I did and the app ran pretty flawlessly (except for screwups in the code >changes.) We have been adding a number of clients so I am moving toward >a clustered environment and trying to update the JVM, Tomcat, etc. > >The problem: > >Starting about a month ago, Tomcat would suddenly fail, no heap dump, no >indication of trouble in the log, no indication the JVM crashed >(JVisualVM continues to hum along), nothing (that I can find.) At first, >we thought it was load related as our heaviest loads are in the early >afternoon and the crashes were consistently 1-2:00PM. Then, last Friday, >it crashed around 4:00PM when there was relatively light load. As nearly >as we can tell, there is no slowness or other indicator the failure is >comingŠ the system just hums along and bam, gone. > >The garbage collection and cpu utilization look pretty normal (garbage >collection is the typical saw edge and cpu utilization is 0-20% with an >occasional short duration spike.) > >I am going back to 1.6.0_7 on server 1 tomorrow. > >I was thinking the only way to potentially get to the bottom of this >would be to take frequent heap dumps between 1:00 and 2:00PM but, while >they may be interesting, I am not certain they will show anything useful >as the system shows no signs of strain before dying. > >Anyone have any ideas? > >Thanks, > >Carl > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >For additional commands, e-mail: users-h...@tomcat.apache.org > This may be a silly question, but do you have the -XX:ErrorFile flag turned on for your JVM so that it would record the error data to a file? I don't think heap dumps are recorded by default. http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.htm l#DebuggingOptions Leon --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
