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Message Posted: Sun, 21 Feb 2010 @ 15:32:18 GMT


     
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Subj:   Parallel efficiency: ImpactCPU vs TotalCPU
 
From:   Anomy Anom

<-- Anonymously Posted: Sunday, February 21, 2010 04:31 -->

Hi,

I know for a single query, we can calculate the parallel efficiency as following:

     ImpactCPU / TotalCPU

But if we calculate this metrics for a user or a system, can we really use

     sum(ImpactCPU) / sum(TotalCPU) ?

I cannot understand sum(ImpactCPU). Is it possible that several single queries of one user are skew, but since they are skew on different AMP, so this user's Parallel Efficiency is not that bad? Can somebody clarify?


thanks.



     
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