Dear Carl,
So this problem happens on one machine or on more than one? If it is
limited to one machine, I would be inclined to run memtest86 on it to
see if the RAM is good.
Kees Jan
On 4 feb 2010, at 02:07, "Carl" <c...@etrak-plus.com> wrote:
Chris,
Interesting idea. I tried over the weekend to force that situation
with JMeter hitting a simple jsp that did some data stuff and
created a small display. I pushed it to the point that there were
entries in the log stating it was out of memory (when attempting to
GC, I think) but it just slowed way down and never crashed. I could
see from VisualJVM that it had used the entire heap but, again, I
could never get it to crash.
Strange because it doesn't have the classic signs (slowing down or
throwing out of memory exceptions or freezing), it just disappears
without any tracks. I am certain there is a reason somewhere, I
just haven't found it yet.
Thanks for your suggestions,
Carl
----- Original Message ----- From: "Christopher Schultz" <ch...@christopherschultz.net
>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Wednesday, February 03, 2010 5:45 PM
Subject: Re: Tomcat dies suddenly
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Chuck,
On 2/3/2010 5:00 PM, Caldarale, Charles R wrote:
From: Carl [mailto:c...@etrak-plus.com]
Subject: Re: Tomcat dies suddenly
I am hoping I can see failure at the point of failure
with the heap dump options
That won't have any effect on the Linux OOM killer. If it is the
OOM killer taking out Tomcat, the JVM will not receive any
notification - all threads will just be terminated with extreme
prejudice. There won't be a chance for the heap dump to happen.
Maybe what Carl should try is to actually cause an OOME without
triggering the "OOM Killer".
Carl: you said that everything is copacetic when you run with a
smaller
heap, right? Well, run with that smaller heap, but then write a
simply
servlet/JSP/whatever that just allocates huge, say, byte[] buffers
until
it gets an OOME and verify that you get a heap dump when that
happens.
- -chris
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