Hipersockets are an absolute godsend. This of course requires you to have
your DB2 data on the same physical z/box as the linux environment. If
you're using the 1.3 version of the IBM http server, dump it. Use the 2.0
version instead.
The other things that have helped were WebSphere related tunings that I
can't speak to here as I am not deeply involved with that, as well as a
couple bugs in the JDBC driver we were using that only existed in *ix
version.
The point that tuning matters. A lot. WAS is a pig. Java is a pig. Don't
skimp on memory, but don't give it too much. 2 IFL's seem to be better
running multiple threads than one, though we will be testing that with some
solid benchmarking soon.
The other point is design design design. Cant stress that enough. If your
application is horribly architected, you will see the monster you have
created on a Z/series environment much more readily than you would on
windows. You might scoff at that, but in this very same application, there
was a methodology that would push 2 IFL's to 92 AVERAGE load. One RPC call
was re-written and the way the application called the RPC was re-written
and now the average load for that application is 21% of 2 IFL's. So review
your code. All the stuff they taught us 20 and 30 and 40 years ago about
tight code, and resource conservation still applies to modern technologies.
Just because memory and CPU horsepower are boatloads cheaper than they were
20 years ago, does NOT mean you should just voraciously consume them. You
will still eventually hit the wall. IBM internal experts stated to us that
a lot of what people assuem are environmental (platform, application
server, etc) are actually application problems
So to sum up, use all of the strengths of your environment, and tune to
minimize the weaknesses.
Watch your resources so that you are getting them in the sweet spot.
Don't write crap code. Code review your code for best practices. Implement
them.
"Kohrs, Steven"
<[EMAIL PROTECTED]>
Sent by: Linux on To
390 Port [EMAIL PROTECTED]
<[EMAIL PROTECTED] cc
IST.EDU>
Subject
Re: Domino 6.5 performance a little
07/19/2004 12:23 disappointing on zLinux
PM
Please respond to
Linux on 390 Port
<[EMAIL PROTECTED]
IST.EDU>
On Mon, 2004-07-19 at 12:06, James Melin wrote:
> using z/linux and
> WebSphere in a tuned environment using all of the available
> performance
> tweaks of that environment. This is repeatable.
>
>
Care to share those tweaks?
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