[Beowulf] Multidimensional FFTs

Joe Landman landman at scalableinformatics.com
Thu Mar 2 13:19:30 PST 2006

On Thu, 2 Mar 2006, Konstantin Kudin wrote:

> By the way, any idea why gigE on Opterons with Broadcom chokes so
> easily with different flavours of "alltoall" operation, such as if done

We have had all manner of problems with Broadcom NICs, usually performance 
related, sometimes buggy tg3, sometimes other surprises.  At this point, 
we typically recommend Intel based NICs whenever possible.  Even if this 
means adding a card.  Your context switch/interrupt load rates will thank 
you as your CPU is not pounded into the dirt (unlike the Broadcom NIC 
based machines).

> via "isend+irecv"? If functioning flawlessly, the scaling would have
> been not too bad, but there seem to be issues of some sort ...
> Konstantin
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