Re: Question on effectiveness of additional processors

We have about 100 users with many batch and BCI jobs.
The system has 64Gb of memory and is full house on SSD drives (8 of them).
We run 2 LPARs, the second is a small .1 processor.
The LPARs share some memory and processor and the processor runs between 50
and 140%. The DEV LAPR is a client LPAR..
I am about to remove the Client LPAR (just an FYI) so the production
systems has all the disk, processor and memory.

Thanks
Darryl.


On Wed, Sep 28, 2022 at 1:09 PM MidrangeL <midrangel@xxxxxxxxxxxxxxxxx>
wrote:

That answer is: "it depends"

Is the system processor constrained? IE: is the CPU % at or near 90%
during peak times? Is there latent demand that is only met after a
period of waiting?
Is the system memory constrained? Are paging and faulting levels high
enough that the system spends quite a bit of resource moving memory
around?
Is the system I/O constrained? Is the system waiting for I/O operations
to complete before moving on to the next task? Look at Disk busy during
peak loads.

Each of those questions can be answered by the performance tools, which
will then guide you where to spend your money. Adding a core will most
likely improve system responsiveness either way since I/O and Memory
also include using system resources to maximize them, but that may not
be the root cause of the performance issue.

Check out Dawn May's blogs regarding using the performance tools to
diagnose the problem. Then you will spend the correct money on the
correct thing. Don't know how to use the tools; get your business
partner or an independent consultant to look at it. IBM will do it as
well via the Lab Services Group.


--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


------ Original Message ------
From "a4g atl" <a4ginatl2@xxxxxxxxx>
To "midrange-l@xxxxxxxxxxxxxxxxxx" <midrange-l@xxxxxxxxxxxxxxxxxx>
Date 9/28/2022 11:57:12 AM
Subject Question on effectiveness of additional processors

How effective are additional processors on the system.

We have a Power8 with 1 processor activated.
If we activate another processor or 2, what benefits should I see?
I have heard that the additional processor will not make much difference,
so why would IBM provide for additional processors?

What am I missing?

TIA, Darryl Freinkel.
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