| Author |
Message
|
| kjreddy |
 Posted: Tue Apr 01, 2008 3:51 am Post subject: Buffer vs Page ? |
 |
|
Novice
Joined: 16 Feb 2007
Posts: 20
|
Hi ,
I wanted to know how many pages make up a buffer.
Is there any fixed formula for this relation between buffer and page.
Regards.,
J K |
|
| Back to top |
|
 |
| Gaya3 |
| Posted: Tue Apr 01, 2008 4:41 am Post subject: |
|
|
Jedi
Joined: 12 Sep 2006
Posts: 2493
Location: Boston, US
|
 
Buffer is a reserved memory area.....
Regards
Gayathri
_________________
Regards
Gayathri
-----------------------------------------------
Do Something Before you Die |
|
| Back to top |
|
|
| kjreddy |
| Posted: Tue Apr 01, 2008 4:50 am Post subject: |
|
|
Novice
Joined: 16 Feb 2007
Posts: 20
|
| I guess buffer is further sub-divided into pages , i wanted to know how many pages make up one buffer. |
|
| Back to top |
|
|
| Vitor |
| Posted: Tue Apr 01, 2008 4:53 am Post subject: Re: Buffer vs Page ? |
|
|
Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
|
| kjreddy wrote: |
I wanted to know how many pages make up a buffer.
|
Are you in fact asking (given where you've posted) about the correlation between page sets and buffer pools?
There's no size correlation as they're used for different things, though they are indeed connected.. Check out the Concepts & Planning guide for full details, and recommendations on sizing/assignment.
_________________
Honesty is the best policy.
Insanity is the best defence. |
|
| Back to top |
|
|
| jefflowrey |
| Posted: Tue Apr 01, 2008 4:55 am Post subject: |
|
|
Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
|
|
| Back to top |
|
|
| bruce2359 |
| Posted: Tue Apr 01, 2008 5:03 am Post subject: |
|
|
Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
|
Managing buffers is well documented in the WMQ z/OS System Admin Guide. How to calculate the number of buffers and bufferpools is described in the WMQ z/OS Planning Guide.
Pages are 4kb each. This matches MVS page size. Buffers are defined in units of pages.
For the DEFINE BUFFERPOOL command, refer to the WMQ MQSC manual. This command is used in the INP1 DD concatenation of your qmgr startup procedure. From the MQSC manual: buffers minimum is 100; maximum is determined by the amount of virtual storage available in the address space.
_________________
I like deadlines. I like to wave as they pass by.
ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
|
| Back to top |
|
|
| kjreddy |
| Posted: Tue Apr 01, 2008 5:57 am Post subject: |
|
|
Novice
Joined: 16 Feb 2007
Posts: 20
|
Pages are 4kb each. This matches MVS page size. Buffers are defined in units of pages.
Does this mean 1 Buffer = X Pages , if so then X must be greater than 1.
Regards.,
J K |
|
| Back to top |
|
|
| Gaya3 |
| Posted: Tue Apr 01, 2008 7:53 pm Post subject: |
|
|
Jedi
Joined: 12 Sep 2006
Posts: 2493
Location: Boston, US
|
| kjreddy wrote: |
Pages are 4kb each. This matches MVS page size. Buffers are defined in units of pages.
Does this mean 1 Buffer = X Pages , if so then X must be greater than 1.
|
Would u mind to tell us, why you need this mathmatic formula.....
Regards
Gayathri
_________________
Regards
Gayathri
-----------------------------------------------
Do Something Before you Die |
|
| Back to top |
|
|
| bruce2359 |
| Posted: Wed Apr 02, 2008 5:01 am Post subject: |
|
|
Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
|
| Quote: |
| why you need this mathmatic formula |
Briefly, buffers are used to hold messages in the address space. Too few buffers may lead to more real i/o.
WMQ for z/OS allows us to associate queues (and therefore messages) to pagesets on DASD to improve performance/throughput.
Please refer to the WM! for z/OS Planning manual for more details on how and why
_________________
I like deadlines. I like to wave as they pass by.
ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
|
| Back to top |
|
|
| belchman |
| Posted: Mon Apr 21, 2008 11:55 am Post subject: |
|
|
Partisan
Joined: 31 Mar 2006
Posts: 386
Location: Ohio, USA
|
Chapter 16 of the z/OS Concepts and Planning Guide will be quite useful for you.
_________________
Make three correct guesses consecutively and you will establish a reputation as an expert. ~ Laurence J. Peter |
|
| Back to top |
|
|
|
|
