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Message-ID: <053001caa59f$97a115a0$6a00a8c0@dan>
From: "Carl" <carl@etrak-plus.com>
To: "Tomcat Users List" <users@tomcat.apache.org>
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Subject: Re: Tomcat dies suddenly
Date: Thu, 4 Feb 2010 08:40:18 -0500
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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" <kjkoster@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" <carl@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" 
>> <chris@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:carl@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
>>> -----BEGIN PGP SIGNATURE-----
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>>>
>>> iEYEARECAAYFAktp/JEACgkQ9CaO5/Lv0PBI0ACgmDLJVxM5xDiN5UIFsqqKRj7i
>>> 2J8AoL8ENGsYxwudtFrLy+tZTzmr/rxC
>>> =4yC9
>>> -----END PGP SIGNATURE-----
>>>
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