[Beowulf] 4+ cpu benchmark machines wanted

Stuart Midgley sdm900 at gmail.com
Mon May 23 16:09:55 PDT 2005

We are using cpusets and memsets to lock our jobs down to a  
particular cpu and the associated numa node memory (we have an Altix  
3700Bx2 running it beowulf style).  We start up MPI jobs and lock  
each process down so that they can't use memory from another numa- 
node.  This is particularly effective as it locks down their page  
cache as well (so their IO doesn't effect the memory bandwidth of  
other jobs).  Unfortunately, those pesky pdflush threads get spawned  
dynamically, so they end up all over the machine.


> We all know how hard it is to schedule jobs and avoid at big single
> partition machines that memory is allocated here and the jobs  
> getting run
> on processes at the other side of the machine, at the same time we  
> want to
> get all cpu's busy so there is no way in avoiding all these problems.

Dr Stuart Midgley
sdm900 at gmail.com

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