On Wed, Mar 11, 2009 at 1:56 AM, Caldarale, Charles R
chuck.caldar...@unisys.com wrote:
It's impossible to prevent at least some objects from eventually migrating to
the OldGen, since anything that persists long enough will end up there after
some number of minor GCs.
But by choosing a
Washburn, Brian J [IT] wrote:
Also if the application is a web app with any kind of response time
requirements I would strongly suggest that you use
[set of four options]
My suggestion is to first get a feel for the current gc behaviour with
jstat on the server:
jstat -gc -t
Chris,
We have 100+ application servers in a loadbalancing (application based,
not tomcat) setup. If servers are removed from the load balancing pool
the others need to be able to pick up the load. So the number of
concurrent users is highly dynamic. You can imagine the problem if we
keep
From: Taylan Develioglu [mailto:tdevelio...@ebuddy.com]
Subject: Re: Effect of Heap Size on Performance?
I think it also gives short-lived objects (for example short
sessions) a longer time to 'die out', so they won't be moved
to tenure because survivor space is increased and gc frequency
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Taylan,
On 3/5/2009 5:11 AM, Taylan Develioglu wrote:
I always hold this as a ground rule:
Increase heapsize as much as possible as long as:
My rule has always been to run with the smallest heap you can get away
with. We ran our main production
On Tue, Mar 10, 2009 at 3:41 PM, Christopher Schultz
ch...@christopherschultz.net wrote:
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Taylan,
On 3/5/2009 5:11 AM, Taylan Develioglu wrote:
I always hold this as a ground rule:
Increase heapsize as much as possible as long as:
My rule has
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Subject: Re: Effect of Heap Size on Performance?
A smaller heap means that you'll catch even small memory leaks faster.
Good for debugging, but provokes more frequent GCs, so may not be optimal for
production. I tend to use
if current
experience is more than 4X normal which can cause extra artificial load.
-Original Message-
From: Caldarale, Charles R [mailto:chuck.caldar...@unisys.com]
Sent: Tuesday, March 10, 2009 9:57 AM
To: Tomcat Users List
Subject: RE: Effect of Heap Size on Performance?
From: Christopher
From: Washburn, Brian J [IT] [mailto:brian.j.washb...@sprint.com]
Subject: RE: Effect of Heap Size on Performance?
Also remember to statically size heap regions manually if you
can as that will always improve GC performance
Don't bet on that; doing so may force excessive minor GCs if you
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Date: Tue, 10 Mar 2009 15:54:11 +0100
Subject: Re: Effect of Heap Size on Performance
From: Martin Gainty [mailto:mgai...@hotmail.com]
Subject: RE: Effect of Heap Size on Performance?
any rules of thumb to follow for restricting heap to eden
(and not jumping the fence to permgen)?
I think you're confusing PermGen with the old (aka tenured) generation. Only
instances
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