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| Buffer Pool Usage |
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| mwathen |
 Posted: Tue Jul 08, 2008 5:42 am Post subject: Buffer Pool Usage |
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Newbie
Joined: 10 Jun 2008
Posts: 5
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| Please point someone new to MQSeries in the right direction! We have four buffer pools defined in our z/OS queue manager. Buffer pool 1 has 50000 buffers defined, and consistently shows about 85% of those buffers in use during the day. I don't know what buffer pool 1 is being used for, but 85% usage seems pretty high to me. Is there a way I can find out what's going in to buffer pool 1? |
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| exerk |
| Posted: Tue Jul 08, 2008 7:08 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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From the Info Centre (link at the top of the page)...
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Buffers and buffer pools
For efficiency, WebSphere MQ uses a form of caching whereby messages (and object definitions) are stored temporarily in buffers before being stored in page sets on DASD. Short-lived messages, that is, messages that are retrieved from a queue shortly after they are received, might only ever be stored in the buffers. However, this is all transparent to the user because the buffers are controlled by a buffer manager, which is a component of WebSphere MQ.
The buffers are organized into buffer pools. You can define up to 16 buffer pools (0 through 15) for each queue manager; you are recommended to use the minimal number of buffer pools consistent with the object and message type segregation outlined in Figure 9, and any data isolation requirements your application might have. Each buffer is 4 KB long. The maximum number of buffers is determined by the amount of storage available in the queue manager address space; do not use more than about 70% of the space for buffers. Usually, the more buffers you have, the more efficient the buffering and the better the performance of WebSphere MQ. |
Hit the Info Centre and put the keyword in the Search box to see the full text and diagram.
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