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| disk I/O performance |
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| mq_crazy |
 Posted: Wed Nov 30, 2005 12:06 pm Post subject: disk I/O performance |
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Master
Joined: 30 Jun 2004
Posts: 295
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| We are having performance issues of disk I/O at almost 100% when we are processing the messages. All the messages are persistent, we are usin mq 5.3 CSD08 on win2003 server. Do you guys suggest any alternatives to reduce the disk I/O??? |
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| hopsala |
| Posted: Wed Nov 30, 2005 7:10 pm Post subject: |
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Guardian
Joined: 24 Sep 2004
Posts: 960
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Hm, maybe:
1. Increase LogBufferSize.
2. MQCMIT less often. Every commit is IO taken, and on average the larger the IO transaction time the more efficiently will your OS handle it. This will also decrease checkpoint frequency, which is probably the "heaviest" IO operation WMQ has to offer.
3. Possibly a memory issue - did you make sure your machine has sufficient RAM?
4. Increase queue buffer size for heavy duty queues.
5. Use larger messages, if possible.
6. Use non-persistent messages when possible.
7. If you indeed use non-persistent messages, use NPMSPEED(FAST) on outgoing channels.
8. Replace your HD to a more self-respecting one that doesn't go about jumpin' to 100% just because someone asked it to write a bloomin' message 
But seriously - HDs today fall off trees, if you ask me this is the cheapest solution (timewise and thus moneywise).
I had here assumed that your queue files and log files are on the same HD; splitting these to two HDs will greatly increase your overall throughput.
Oh, and lest we forget: CSD08 is a rabid gerbil just waiting to bite someone (see CSD08 AND CSD09) if you wish for your WMQ net to remain stable for much longer, you must upgrade - yesterday. |
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| mq_crazy |
| Posted: Thu Dec 01, 2005 7:46 am Post subject: |
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Master
Joined: 30 Jun 2004
Posts: 295
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| Thanks hopsala, i will definitely try your solutions. |
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| hopsala |
| Posted: Thu Dec 01, 2005 9:40 pm Post subject: |
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Guardian
Joined: 24 Sep 2004
Posts: 960
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| Keep us posted, i'm curious to know where this leads... |
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| Tibor |
| Posted: Thu Dec 01, 2005 11:47 pm Post subject: |
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Grand Master
Joined: 20 May 2001
Posts: 1033
Location: Hungary
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| Perhaps you can change the LogWriteIntegrity parameter, carefully, details in the information center. |
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