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Date: Thu, 03 May 2012 17:37:47 +0200
From: =?UTF-8?B?TWlndWVsIEdvbnrDoWxleiBDYXN0YcOxb3M=?=
 <miguel_3_gonzalez@yahoo.es>
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To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: Tomcat pausing and no java process
References: <4FA25F8C.6030804@yahoo.es> <4FA28854.6000300@pidster.com>
 <4FA29612.10106@yahoo.es> <4FA29D50.5060404@christopherschultz.net>
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> Unlikely. If you are using SSL or serving large static files,
> APR/tcnative should be something that you look into using.
I do use SSL, but all is dynamic jsps
>
> Honestly, I would put more effort into upgrading to a more recent
> version of Tomcat than looking into using APR/tcnative.
>
>>>> No errors before in catalina.out. The only error found today
>>>> (It crashed 3 times in 3 hours) was an outofmemory error.
>>>>
>>>> I changed from 1024Mb to 1536Mb in catalina.sh:
>>>>
>>>> CATALINA_OPTS="$CATALINA_OPTS -Xms1536m -Xmx1536m"
>>> Do you actually have 2Gb of free RAM to assign to the Tomcat
>>> process?
Well, as someone asked:

]# cat /proc/meminfo
MemTotal:      4194304 kB
MemFree:      3700308 kB

> Tomcat 5.5 doesn't really care what heap size it's got as
> long as it's more than 4MiB or so. The page you referenced in here
> doesn't even mention Tomcat 5.5.
>
> Usually the GC does do its job properly, and that includes pausing the
> whole JVM in order to reclaim memory if necessary. The above thread
> from ServerFault is about unresponsiveness, not about OOME: the GC
> caused unresponsiveness to avoid OOME (and it worked).
>
> Stop making crazy claims and actually look at your own environment to
> figure out what's going on.
We had several crashes today:

First - 1 outofmemory error
Second- 3 Tomcat pausing
Third - 2 or 3 times where catalina.out didn't show any error and tomcat 
died, only a big increase of memory use right before the java process 
died. That's why I assumed that maybe I have set the heap memory too 
high (I set it up because of the out of memory errors). That's why I 
googled to see if anyone had seen issues and that's why I reached that URL

I have set up this:

-XX:+HeapDumpOnOutOfMemoryError -XX:+UseConcMarkSweepGC -Xms128m 
-Xmx768m -verbose:gc -XX:+PrintGCTimeStamps -XX:+PrintGCDetails

I hope this way I can trace if there is any memory leak in the webapp. 
Considering that the developer decided to restart Tomcat once a week 
because the webapp didn't have enough resources, I find this very likely.

Thanks for your inputs,

Miguel


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