[Beowulf] Single threaded memory bandwidth compared between Nehalem-EP and Westmere-EX

Joe Landman landman at scalableinformatics.com
Mon Oct 21 18:39:22 PDT 2013


On 10/21/2013 08:37 PM, Christopher Samuel wrote:
> -----BEGIN PGP SIGNED MESSAGE-----

[...]

> [root at turpin ~]# numastat stream_c.exe
>

Maybe some 'perf stat' output might help as well.  The numbers sound a 
great deal like something running over a single QPI link, so I thought 
an affinity issue.

Hows the ram clocked?  Is this a very big cache coherent machine, or 
nodes of a cluster built from NUMA nodes?




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