Re: How to estimate amount of memory to assign to a memory pool

While I appreciate the IBM i performance adjustment function quite a bit, it's far from foolproof, and I am finding quite a few of my customers turning it off.

If you are not using performance adjustment, don't turn it on just for this, that could cause a long list of unintended consequences. If you are using the performance adjustments, then you might consider using a separate storage pool as you suggested, but tune the shared pool with WRKSHRPOOL then F11 until you can set the priority and maximums for that pool. That way you can allow the performance adjustment to work, while throttling back the process that should be mostly I/O if I ready your email correctly.

At V7 of IBM i you can do workload groups, but that is not granular enough (only down to one processor) for 99.5% of the performance tuning scenarios that most folks run into since most LPARs are less than one processor or only one processor to start with.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 6/26/2012 2:23 PM, sjl wrote:

Richard -
If they have the system set up for automatic performance adjustment, I would
set it low and let the system auto-tuner adjust it.
- sjl

Richard wrote:
I have a job that migrates spool file images from a jukebox to Dasd. My
thought is that I should segregate this job from the normal system processes
so as to avoid any possible resource contention as I cannot affect the day
to day running of the companies where these migrations will be occuring.
That said, I created a new single threaded sub system. When assigning a
memory pool, how do I go about calculating the storage size?


--