We are going to actually be testing exactly that shortly. We're going to
load test an WAS environment/application on on IFL vs 2 IFL's to see how it
performs.
I will share those findings when I have the testing completed and the data
compiled.
Adam Thornton
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IST.EDU> Subject
Re: Performance with Multiple CPUs
06/24/2004 09:18
AM
Please respond to
Linux on 390 Port
<[EMAIL PROTECTED]
IST.EDU>
On Thu, 2004-06-24 at 07:39, Malcolm Beattie wrote:
> Both the original question and this response are rather ambiguous.
> I suspect that when Adam refers to "4 engines in an LPAR", he is
> thinking of Linux running by itself (no z/VM) in that LPAR and that he
> assumes the original poster means the same.
Yes, that is what I assumed.
If you have z/VM and you're spreading the load among a bunch of virtual
machines, 4 engines very well may make a lot of sense.
However, if you're doing this, I'd still recommend that each Linux
guest--unless you have a single guest that needs more than 2 real
engines, in which case, consider your workload--have no more than two
(virtual) engines defined.
That said, if you have more than one actual processor, I would define
all the guests as two-processor machines. It seems to me--and this is
nothing I have any data to support, so Barton is not interested--that if
you're running on multiple physical engines, two-processor Linux images
generally make better use of the real resources than uniprocessor
virtual images, and you get more consistent (less peaky) use of the real
CPU resources. I *would* like to see some actual measurement data if
anyone has some they can share.
Adam
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