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General Questions and Answers / Speed issue in Two probe configuration

« on: May 21, 2009, 13:37 »

Hi,

I am doing benchmarking for Two probe configuration using ATK software.

we have two systems
   1) 16 CPU with per CPU configuration
      cpu MHz         : 2400.090
      cache size      : 4096 KB

   2) 8 CPU with per CPU configuration
      cpu MHz         : 3000.116
      cache size      : 6144 KB

The problem is that with 16 CPU system the running time is apx 12 hours but on 8 CPU sytem it is much more that 12 * 2 (24) hours
On 16 CPU machine one loop takes 3-4 minutes but on 8 CPU nachine it takes 18 - 40 minutes.

We are using MPICH2.

Can some please suggest me if this is expected behaviour ?
Or there is some configuration/ sytem problem / something we can try.

Regards
Anshu