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Date:      Thu, 07 Nov 2002 11:02:18 +0100
From:      Erwan Arzur <erwan@netvalue.com>
To:        Aditya <aditya@grot.org>
Cc:        freebsd-java@freebsd.org
Subject:   Re: preventing the JVM from swapping to disk
Message-ID:  <3DCA3A2A.7030904@netvalue.com>
References:  <20021107023304.GA75921@mighty.grot.org>

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Aditya wrote:
> On a server solely dedicated to running Tomcat with the linux-jdk1.3 and 1Gig
> of RAM I'd like to prevent the JVM from ever swapping to disk. The preferred
> behaviour when it runs out of memory is for the JVM to exit (it will be
> restarted by a script). I'm allocating the JVM 700M for the min and max heap;
> less than 100M is used by FreeBSD and the rest is occupied by the JVM.
> 

One piece of advice before blindly set -Xmx700m -Xms700m, make sure you 
read this article : 
http://www.javaworld.com/javaworld/jw-01-2002/jw-0111-hotspotgc_p.html
and all assorted references at the end of it.

I really think FreeBSD VM subsystem requires you to allocate swap space. 
I guess  you'll get suboptimal performance results by simply disabling it.

don't forget your dear google friend ;-)

http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=utf-8&q=freebsd+disabling+swap&btnG=Google+Search
-- 
UNIX *IS* user friendly.  It's just selective about who its friends are.
                                                                --unknown


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