Kees Jan,
Actually, since the first machine I brought it up was brand new, my first
thought was a bad memory stick that only had a problem in a certain
temperature range. However, running memtest86 for 30 hours showed nothing
and the problem happened on a second machine (also brand new but a different
processor, motherboard, etc. but same OS, Java and Tomcat) so I don't think
it is a problem with the hardware. I did try a different OS (openSuse) and
it showed the same problem. I also tried the latest 32 bit Java on a fresh
install of 32 bit Slackware but that also showed the problem (even though an
older version of Slackware 32 bit running Java 5.5 from several years ago
does not... this setup has run flawlessly for 3-4 years.)
Thanks for you suggestions.
Carl
----- Original Message -----
From: "Kees Jan Koster" <kjkos...@gmail.com>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Thursday, February 04, 2010 12:47 AM
Subject: Re: Tomcat dies suddenly
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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