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Message Posted: Sun, 21 Feb 2010 @ 19:09:25 GMT


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

<-- Anonymously Posted: Sunday, February 21, 2010 13:29 -->

It seems you understand well. Despite the fact that it returns a number, sum(ImpactCPU) is not a "metric" in any meaningful sense, and you can't arrive at system parallel efficiency by summing user-level metrics that have already been aggregated to remove the crucial VPROC dimension. (What's that? Data Warehousing 101 - you need the detail data?)

That said, on many systems the sum(ImpactCPU) is valuable as an indicator of something that bears further investigation - just like LHR or PJI.



     
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