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| Cost of mqsichangeflowstats ? |
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| JYama |
 Posted: Thu Sep 27, 2007 2:01 am Post subject: Cost of mqsichangeflowstats ? |
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Master
Joined: 27 Mar 2002
Posts: 281
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Hello, expterts,
I'm going to collect accounting&stats information of WMBv6 on AIX.
Is there anybody who's familiar with the cost and overhead of mqsichangeflowstats?
Many thanks in advance,
Yama |
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| mqmatt |
| Posted: Thu Sep 27, 2007 7:46 am Post subject: |
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Grand Master
Joined: 04 Aug 2004
Posts: 1213
Location: Hursley, UK
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| The cost to your message flow should be quite low, because most of the work is done by a separate asynchronous collector thread, which does its work as and when CPU conditions allow. |
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| JYama |
| Posted: Thu Sep 27, 2007 6:01 pm Post subject: |
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Master
Joined: 27 Mar 2002
Posts: 281
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| mqmatt wrote: |
| The cost to your message flow should be quite low, because most of the work is done by a separate asynchronous collector thread, which does its work as and when CPU conditions allow. |
Thank you very much for your info.
BTW, according to a performance report of WMBv6 on AIX, I can see that one of the sections mentions overheads of Statistics&Trace on a messageflow like;
| Quote: |
Using Accounting and Statistics
This test consists of running a single copy of the Large Messaging sample with basic thread
level and advanced node level accounting activated.
Using a 1K message size there was an 8% reduction in message throughput. This is a CPU
overhead and reflects the additional cost of processing needed to collect the data. |
8% reduction is much heavier than the one I was expecting. 
Of course, this kind of number really depends on the situation and environment. But I'm not sure whether 8% is reasonable or not...  |
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| mqmatt |
| Posted: Fri Sep 28, 2007 2:33 am Post subject: |
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Grand Master
Joined: 04 Aug 2004
Posts: 1213
Location: Hursley, UK
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Try enabling it in your environment and see  |
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