Re: Memory Pool questions

[Vernon Hamberg <vhamberg@xxxxxxxxxxxxxxx>]

Hi Aaron

It's been awhile, but here goes some thoughts.

Generally I'd say leave QPFRADJ set to, say, '1', at least.

For *INTERACT - that's a shared pool. I THINK you can set an attribute 
of it to *FIXED - then it will not be changed.

If you can't *FIXED, you could make QINTER be a non-shared pool, like in 
the good-really-old days.

There is also a WRKSHRPOOL command that gives you some options as to 
mins and maxes and all, for things like *INTERACT and *SHRPOOL1 to whatever.

HTH
Vern

On 1/27/2016 12:16 PM, Aaron Bartell wrote:
> Preamble...
> I've been playing with memory pools the past two weeks.  I also installed
> iDoctor to learn more about what is consuming CPU/memory/IO.  I have set
> QPRFADJ to '0' so I can adjust memory pools and have them stick.
>
> Side note: Memory pools rock.  Very cool feature, IBM i.
>
> Questions...
> - Is it a bad idea to set QPRFADJ to '0'?  My reason is that I don't want
> the *INTERACT pool to have much because I'd rather it be dedicated (always)
> to *BASE (where my open source/ssh is running).
>
> - In reviewing iDoctor ActiveJobs screen it appears my 5250 sessions are
> the only things operating on *INTERACT, so I think I am safe lowering this
> value from 600MB to 40MB.  Having it at 40MB hasn't been uncomfortably slow
> (going on a week now).    Are there any gotchas with setting it so
> low?(i.e. other types of jobs that I am not yet seeing)
>
> - The IBM docs(n1) say "The memory pool size should be large enough to keep
> data transfers (paging) at a reasonable level as the rate affects
> performance."  Well, the obvious next question is "what is reasonable"?  I
> consistently see "Active Wait" for *BASE at 3200-3500 and "Non-DB Faults"
> around 15 and "Non-DB Pages" around 37. This seems like a reasonable amount
> of faults given I am trying to do a variety of heavy lifting things all at
> once.  This would also lead me to believe my system currently has enough
> memory at its disposal and if I am looking for next areas of improvement I
> should look to CPW.
>
> n1 -http://bit.ly/ibmi-about-memory-pools
>
> Aaron Bartell
> litmis.com - Services for open source on IBM i