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| Buffer Size and PageSet Size |
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| bay hoe san |
 Posted: Mon Aug 27, 2007 9:45 pm Post subject: Buffer Size and PageSet Size |
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Centurion
Joined: 27 Nov 2006
Posts: 117
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Hello,
( 1) Buffers more than Pages better or vice versa? Anyone can shed some light.
( 2) I have been trying to map qmgr started tasks - MSTR & CHIN real storage and the buffer alloted but it does not seem to match. My query: is my comparsion correct? If not, why?
From SDSF;DA
JOBNAME TYPE JNUM POS DP REAL PAGING
MQE3MSTR STC 2499 NS F9 1179 0.00
MQE3CHIN STC 2500 NS F9 601 0.00
In MQE3, using display usage:
Page Buffer Total
set pool pages
_ 0 0 10078
_ 1 0 10078
_ 2 1 10078
_ 3 2 10078
_ 4 3 10078
Buffer pool 0 has 5000 buffers
Buffer pool 1 has 10000 buffers
Buffer pool 2 has 12000 buffers
Buffer pool 3 has 15000 buffers
( 3) From SDSF;DA, total real storage approx (1179 + 601) 1800 frames, while total buffer = 42000.
Pls advise.
Thank you.
.Hoe San. |
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| Vitor |
| Posted: Mon Aug 27, 2007 11:32 pm Post subject: Re: Buffer Size and PageSet Size |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| bay hoe san wrote: |
| ( 1) Buffers more than Pages better or vice versa? Anyone can shed some light. |
There is no right answer that doesn't involve not putting user object in page 0. The Performance Redbooks will guide you on tuning issues. Enjoy.
| bay hoe san wrote: |
| ( 2) I have been trying to map qmgr started tasks |
Why? Are you having performance issues? If not, why do you care? If so, use standard system facilities to track resource usage & consult with your sys prog.
| bay hoe san wrote: |
| ( 3) From SDSF;DA, total real storage approx (1179 + 601) 1800 frames, while total buffer = 42000. |
See above
| bay hoe san wrote: |
| Pls advise. |
I advise you to look at the z/OS documentation, not just the MQ stuff, concerning tuning & resource usage. I also advice you to post this sort of thing in the Mainframe section! 
Is there a Moderator in the house??? 
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| bruce2359 |
| Posted: Tue Aug 28, 2007 8:19 am Post subject: |
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Guest
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Pageset 0 holds object definitions on DASD. Pagesets 1-x hold messages on DASD. To effectively size your pagesets, you will need to understand your applications, their message size and quantity, growth over time, and which are short-lived (in virtual storage) and which are long-lived (will reside on DASD).
Buffers hold messages and log images in virtual storage on their way to DASD. To effectively size your buffers, you will need to understand message size and flow, short- vs. long-lived messages - pretty much the same issues as above. Too few buffers drives more I/Os to DASD.
The technical (math) issues are documented in the MQ Concepts and Plannaing manual, and the System Setup manual. |
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