This is what Microsoft has to say on 64 bit using Websphere.
Basically 32bit better for small volume servers that can live with a 2GB
memory ceiling.
Fundemental problem is that a process can only use 2GB no matter how
much memory you have.
Java VM only gets to see 2GB no matter how much physical RAM you have.
Once you get serious about transactions, 64 bit cleans 32 bit.
Your entire software stack has to be written to use the extra memory
addressing. OS, JVM, Servlet Engine.
If you run a 32 bit Linux at the bottom, you are screwed, If you run a
32bit Java Run-time, screwed again.
This is likely the big reason why high volume applications run on
"Enterprise" platforms rather than open source.
It is not about the quality of the software; it is about the attention
to performance and the extra care in making sure that the whole stack is
64 bit.
The subject title of this topic is a bit misleading. It should be
something like "Tomcat with 2 GB on an 8GB machine"
Its all in the numbers.
http://msdn2.microsoft.com/en-us/vstudio/aa700838.aspx
Tests were all run on the same hardware (AMD) so you can get past the
"CPU speed" issue.
How do you compare speed on AMD versus Intel (same $$$, similar product
number, same clock speed, same marketing hype)?
Ron
Peter Crowther wrote:
From: Joe Nathan [mailto:[EMAIL PROTECTED]
Overall performance depend on many things: CPU speed, number of CPUs,
memory size, I/O, especially, virtual memory paging, network interface
bandwidth
64bit machines come with better capacity except
cpu computation speed!
Please state your references on this - at present, you're asserting it
without showing evidence to back you up. Excuse us if we're
collectively sceptical when what you're saying goes against our
experiences and you don't supply backup.
Have you ever tried 64bit Windows desktop or laptop over
32bit machine?
Yep. Routinely.
Otherwise 64bit machines suck! That;s why 64bit Windows is not
popular. I don't them many shops selling!
64-bit Windows is unpopular because of poor application compatibility,
just as Vista is unpopular because of poor application compatibility.
Few people buy an OS for speed or technical capability; they buy it
because it runs the apps they need/want.
- Peter
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