[Beowulf] Re: SGI to offer Windos on clusters ---> Skew/Jitter paper

Peter Kjellstrom cap at nsc.liu.se
Mon Jan 22 12:14:39 EST 2007


On Monday 22 January 2007 16:39, Ashley Pittman wrote:
...
> In answer to a previous post about using extra CPUS/cores to alleviate
> this problem it's not a new idea, IIRC PSC were doing this six or seven
> years ago,

I was well aware that it wasn't new at all, my main point was that given 
the "core explosion" going on it's getting more interesting and cheaper every 
day.

> I'd be interested to see if hyperthreading helps the 
> situation,

Yes numbers on this would be interesting, my initial guess would be that it 
would be good (assuming that you never schedule more work than you have 
actual cores or course).

/Peter

> it's almost always turned of and any cluster over 32 CPU's 
> but it might be advantageous to enable it and use something like cpusets
> to bind the application to real CPU's whilst letting the resource
> manager/Ganglia/sendmail twiddle it's thumbs on the other virtual 20%
> CPU.
>
> Ashley,
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