HyperThreading in Cluster

Orion Poplawski orion at cora.nwra.com
Thu Jun 5 16:03:58 EDT 2003

This is partly prompted by Steven Timm's recent comment about 
HyperThreading, as well as something I read in a magazine the other day 
stating the HPC clusters need to run with HyperThreading off.  Can 
anyone shed more light on the current status of HyperThreading in 
parallel computing? 

I could see where allocating two compute threads to a single processor 
might bog things down (swapping data sets in/out of cache, etc.),  but 
it would seem ideal to allocate one compute thread per processor, and 
let the other virtual processor help with OS/interrupt type operations.  
Does the linux scheduler have such control yet?

Orion Poplawski
System Administrator                   303-415-9701 x222
Colorado Research Associates/NWRA      FAX: 303-415-9702
3380 Mitchell Lane, Boulder CO 80301   www.co-ra.com

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