From experiences with Websphere runnning on z800 and z890 machines (z/VM, SLES8), it is still a problem of CPU constraints. As far as I can see, irrespective of how much Main memory in the CP directory and / or vdisks swap, it still does not perform as it should.
I hope your (holy) missives to IBM yield results.
One customer in an unnamed EU country took it off the Mainframe because of this.
PS Neither Java or C++ are my strong points...
PPS IBM (Zaaps) know of this. Maybe things will take a while to trickle down.
John
Fargusson.Alan wrote:
I have to wonder if the deploy takes a lot of memory for a short period of time. This would cause other applications to page out, but by the time you look at memory the deploy has finished using most of it.
-----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of James Melin Sent: Thursday, February 24, 2005 12:47 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: Anyone running WebSphere under linux on z/Series AND using wsadmin scripts for application deployment?
Linux on 390 Port <LINUX-390@VM.MARIST.EDU> wrote on 02/24/2005 11:48:57 AM:
Java does garbage collect. The garbage collection occurs when an object
is
no longer referenced. If an application is building data structures (perhaps collections, arrays etc of objects), then they all hang around. If the application is going in some kind of loop or launching multiple threads that may not be synchronizing, the accumulated baggage could balloon. You have to look at stack trace or use some Java debugging features to find out how the memory usage is growing.
Are you able to identify the offending application (servelet or applet)?
That's the maddening thing. It doesnt appear to be an application per-se. It's happenign when an application is deployed to a server whether or not you use the batch script or the admin console gui. I've penned a missive to IBM but have not heard back yet.
There should be enough java tools to check for this kind of problems.
BTW, I am a perler and I know little about Java. __________________________________________ Ranga Nathan / CSG Systems Programmer - Specialist; Technical Services; BAX Global Inc. Irvine-California Tel: 714-442-7591 Fax: 714-442-2840
James Melin <[EMAIL PROTECTED]>
Sent by: Linux on 390 Port <LINUX-390@VM.MARIST.EDU> 02/24/2005 08:53 AM Please respond to Linux on 390 Port <LINUX-390@VM.MARIST.EDU>
To LINUX-390@VM.MARIST.EDU cc
Subject Re: Anyone running WebSphere under linux on z/Series AND using wsadmin scripts for application deployment?
Linux on 390 Port <LINUX-390@VM.MARIST.EDU> wrote on 02/24/2005 10:44:10 AM:
On Feb 24, 2005, at 10:32 AM, James Melin wrote:
What I'm trying to figure out is.... how does an application with a 448 meg memory footprint come to use more than a gig of swap space?
Shutting down a process should only free up the memory it was using that happened to be swapped out correct?
So how does shutting down all of WebSphere get the gig of swap space
to
come back?
Because it's not the Websphere process itself, but one of its children, that's leaking memory like that. One of your application programmers needs to be taken behind the woodshed and soundly hided, because some program somewhere is leaking badly.
Ok.. how do I prove what part is leaking? It does this no matter what application we deploy. Whether we deploy it via the administration
console
or the wsadmin script....I don't see this during application execution... only during the deployment process. It's driving me batty.
Remember that Java was supposed to stop all that because it's garbage-collected? Hah.
Adam
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