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| Pub/Sub Performance |
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| rwa |
 Posted: Mon May 05, 2003 11:51 pm Post subject: Pub/Sub Performance |
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Voyager
Joined: 22 Jan 2002
Posts: 76
Location: Duesseldorf/Germany
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Hi,
I am using retained Publication in my Pub/Sub Configuration. The Broker (V2.1 csd3), WSMQ (V5.2) and the testapplications (Perl 5.6, Perl-MQSeries 1.19) are running on a SUN V880 (4CPU/8GByte). The publication flow consist only of a InputNode, a ComputeNode to create the RFH2-header and an PublicationNode.
I got 20 publications per second using one publisher and one subscriber. The load on the computer was very low but with an high io-wait. This is due to the processing of an publication in the database (DB2 V7.2.6). A change in an publication value is done with an delete and insert in the database.
The same configuration (Releases, Flows, Perl, etc.) on an Windows 2000 box (1CPU, 1GByte) processes 200 publications per second.
Why is the V880 installation so slow (not only compared to the Windows box but also the total performance)?
Is there a performance problem with the Merant ODBC driver?
Regards,
Rainer |
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| jefflowrey |
| Posted: Tue May 06, 2003 6:11 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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I think you answered your own question:
| Quote: |
| The load on the computer was very low but with an high io-wait. |
Why is the I/O wait so high? Is your disk slow? Are you using the same file system for your database and MQSeries? |
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| rwa |
| Posted: Tue May 06, 2003 7:27 am Post subject: |
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Voyager
Joined: 22 Jan 2002
Posts: 76
Location: Duesseldorf/Germany
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I know that the high io-wait is an external view of the problem, but why is the io-wait so high? Is it due to the delete/insert conbination instead of an update?
DB2 and MQSeries are using different filesystems. |
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| rwa |
| Posted: Tue May 06, 2003 7:29 am Post subject: |
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Voyager
Joined: 22 Jan 2002
Posts: 76
Location: Duesseldorf/Germany
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To add:
The V880 is using firechannel discs and this discs are very fast (At least SUN is telling this). |
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