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Date: Mon, 11 Jan 2010 23:06:31 +0000
Message-ID: <e0c148a1001111506t6f563b2p53f3797151317194@mail.gmail.com>
Subject: Re: JVM goes away
From: Peter Crowther <peter.crowther@melandra.com>
To: Tomcat Users List <users@tomcat.apache.org>
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2010/1/11 Carl <carl@etrak-plus.com>:
> This is a new server, a Dell T110 with a Xeon 3440 processor and 4GB memo=
ry. =A0I 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=3D"-Xms2400m -Xmx2400m -XX:PermSize=3D512m -XX:MaxPermSize=3D51=
2m"
>
> I have watched observed the memory usage and general performance with Jav=
a VisualVM and have seen nothing strange. =A0GC 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. =A0Without warning and with no tracks in any log (Tomcat=
 or system) or to the console, the JVM will just go away, disappear. =A0Som=
etimes, the system will run for a week, sometimes for only several hours. =
=A0Initially, 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 s=
een from top) but it is nowhere near the machine physical memory.
>
> The application has been running on an older server (Dell 600SC, 32 bit S=
lackware, 2GB memory) for several years and, while the application will thr=
ow exceptions now and then, it never crashed the JVM. =A0This leads me to b=
elieve 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 t=
o 32 bit.
>
> I plan to reinstall Java tonight but, it would seem if the JVM were corru=
pted, 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

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