Myrinet in PCI 32bit running 33MHz

[morris at sci.hkbu.edu.hk]

Dear Dr. Skjellum,

Thanks for your quick answer to my posting about Myrinet.
Nowaday, there are motherboards with both 32-bit, 33MHz and 64-bit,
66MHz PCI bus.  I would like to ask if the same Myrinet 2000 was
plugged on the 32-bit, 33MHz PCI bus much slower than it was
plugged on the 64-bit, 66MHz PCI.  How does it affect the Message
Passing performance?  Hope to seeing your opinion.

Regards,

Morris Law
Assistant Computer Officer    Address : 224 Waterloo Road, KLN, Hong Kong
Science Faculty               Tel : (852) 23395909   Fax : (852) 23395862
Hong Kong Baptist University  WWW : http://www.sci.hkbu.edu.hk/~morris
Email : morris at hkbu.edu.hk  or  morrismmlaw at yahoo.com       ICQ : 6380626
=========================================================================


On Sun, 13 May 2001, Tony Skjellum wrote:

> yes, you can get a lot more performance from the Myrinet 2000,
> if the switches are also the new generation.
>
>
>
> Anthony Skjellum, PhD, President (tony at mpi-softtech.com)
> MPI Software Technology, Inc., Ste. 33, 101 S. Lafayette, Starkville, MS 39759
> +1-(662)320-4300 x15; FAX: +1-(662)320-4301; http://www.mpi-softtech.com
> "Best-of-breed Software for Beowulf and Easy-to-Own Commercial Clusters."
>
> On Mon, 14 May 2001 morris at sci.hkbu.edu.hk wrote:
>
> > To all experience Myrinet user in beowulf cluster,
> >
> > In Myrinet site, it is recorded that Myrinet adapter plugged in 32-bit
> > and 64-bit running 33MHz or 66MHz varies in DMA transfer rates, thus
> > affecting the data-rate performance.
> >
> > How is the data-rate performance affect the overall performance?  I
> > just got 32-bit PCI running 33MHz.  Is there any significant performance
> > difference after I replaced the current motherboard that is equipped with
> > 64-bit, 66MHz PCI bus?
> >
> > Any opinion is welcome.
> >
> > --
> > Morris Law
> > Assistant Computer Officer    Address : 224 Waterloo Road, KLN, Hong Kong
> > Science Faculty               Tel : (852) 23395909   Fax : (852) 23395862
> > Hong Kong Baptist University  WWW : http://www.sci.hkbu.edu.hk/~morris
> > Email : morris at hkbu.edu.hk  or  morrismmlaw at yahoo.com       ICQ : 6380626
> > =========================================================================
> >
> >
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>
>