Slave, I have not used WSAD on my Athlon 64 yet, but I would advise 1 Gig minumum for Websphere alone. At work our websphere only workstations use 1 gig. The workstations with a Database running as well as WSAD get 2 or more gig. These are pentium iv, 3.0 GHz boxes. There are many ways to tune Websphere performance. Google is your friend. You will find most advice for tuning the performance of applications you create with webshere, but careful searching will give you sources for tuning WSAD studio. Websphere will take as much memory as you give it. this is partly due to the design of the IBM Java engine. As noted in this paper: http://www.bmu-beratung.com/BMU-Download/pews.pdf Here is an excerpt: "For the IBM Java virtual machines (JVMs) the size of the Java heap is controlled by the -Xmx parameter. So for example to limit the Java heap to a maximum size of 128 MB, you would add the following startup parameter -Xmx128M. If this parameter is not supplied, the default behavior for an IBM JVM is to set the maximum Java heap size to one half of the size of physical memory. If your computer had 512MB of physical memory, the Java heap for each Java process could grow to 256MB. Since the Java process requires memory for things other than the Java heap, like for storing byte codes, stack frames, native code, etc, the memory requirements for the entire Java process could exceed 256MB. This other memory is depicted as "Java Other" in the figures above, and it is not affected by the -Xmx parameter." So even going to 2 Gig, the JVM will take 1 Gig away, unless you limit it to less. Good Luck, Seán On Wed, 02 Jun 2004 13:41:33 +0200, slava zimine wrote:

Hi to al & esp to Andreas Jaeger

I'm seeking for advise to upgrade my workstation to amd64 platform.

OS: suse 9.1

main usage: (ejb/servlet swt gui java development )

typical session load: Eclipse-gtk, or Websphere Dev Studio + Jboss or WebSphere App Server or Tomcat + oracle & mysql dbs + vmware sometimes (with XP loaded )

Question: 1. what proc to choose ?

1 desktop Amd Athlon 64 3400 (2.2 GHz) or 2 x amd opteron 242 ( 1.6 Ghz)

Are there java performance gains when using opterons which will justify +300$ price difference apart from a reason from sun that it will ship a jvm tuned specifically for amd64 opteron?

2. 1 or 2 Gig RAM Memory ? on my current ahtlon 1400 , 768 Meg Ram the WebSphere App Server takes almost 1.5 min to boot. I'd like to decrease this time .

Thank you for you comments.

slz

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