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Date: Tue, 21 Aug 2007 13:49:27 +0100
From: Paul Singleton <paul@jbgb.com>
Organization: Jambusters Ltd
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To: Tomcat Users List <users@tomcat.apache.org>
CC: jeff@propertykey.com
Subject: Re: Does anyone have an approach to checking if Tomcat instance is
 UP?
References: <d86773480708200748j53888b46j6f903129a9c12dc9@mail.gmail.com>
 <82f04dc40708200901i603303d9t3bc121a4c48ea3dd@mail.gmail.com>
 <46C9BC9B.3000600@christopherschultz.net> <46C9C06E.2040506@propertykey.com>
In-Reply-To: <46C9C06E.2040506@propertykey.com>
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Jeff Hoffmann wrote:
> Christopher Schultz wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> Dan,
>>
>> Dan Armbrust wrote:
>>> A simple cron job that points to a URL using lynx, and greps the
>>> output for what it should see will do the trick...
>>
>> I would use wget instead of Lynx, but that's just me.
>>
>> Don't forget that the OP said that his JSPs appear to run correctly even
>> after the OOME.
> 
> If what you're concerned about is an OOME, you can have a JSP that 
> queries the runtime memory usage and outputs something easily parsable 
> to alert you to a (pending) problem.  IE:
> 
> Runtime rt = Runtime.getRuntime();
> double used = rt.totalMemory()-rt.freeMemory();
> double free = rt.freeMemory();
> double available =  rt.maxMemory()-rt.totalMemory();
> double usedpercent = (used/rt.maxMemory()) * 100;
> double freepercent = (free/rt.maxMemory()) * 100;
> double availablepercent = (available/rt.maxMemory()) * 100;

Thanks for this - is there a similar (or any) way to
anticipate "out of PermGen"?

Paul S.

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