On 08/29/2013 10:31 PM, Prentice Bisbal wrote:
Albert,

It looks like you are trying to compile for an IBM Power 7 system. What is the 'other machine' you are comparing it to, and did you use the same number of cores in each case?

Prentice

yes it is. here is the configurations:

 * 4 IBM POWER7 processors; detailed configuration:
     o architecture ppc64 (specification Power ISA v.2.06)
     o 64 bit
     o 8 cores
     o core clock rate 3.83 Ghz
     o up to 4 SMT threads per core
     o 64 kB (32 kB instructions + 32 kB data) cache L1 per core
     o 256 kB cache L2 per core
     o 4 MB cache L3 per core
 * SMP
 * 32 cores
 * 128 GB RAM
 * theor. peak perf. 980 GFlops/s
 * dedicated operating system AIX 7.1


I compared with the following one, obviously the following one hardware is poor than above one but efficiency is much better. There must be something wrong with the compiling....

    AMD Quad-Core Opteron 835X nodes
x86_64 architecure 432 nodes
16 cores each
16/32 GB per node for memobry

THX

Albert


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