Re: [myrinet] RE: Re: Using multiple Myrinet in parallel?

On Tue, Aug 28, 2001 at 07:44:27AM -0400, Tenhave, Tim wrote:
> Careful, some systems have 2 or more distinct primary PCI buses (Compaq's
> AlphaServer ES40, DS20E, AS4100, etc).  So it is possible to have more than
> one Myri adapter in a box.  The questions are legitimate.  Any takers on the
> original message, I have been asked this same question recently from a
> potential research customer.  
> 
> I know it is possible, how do you do it with a relative balance across the
> multiple adapters?
> 
> Tim

I think we need some os hacking to coupling two interfaces.
This is true for ethernet adapters which can be balanced dinamically
with recent linux kernels (2.4 series). I do not know if the two buses
can be managed easily.

> 
> -----Original Message-----
> From: Francesco Lovergine [mailto:[email protected]]
> Sent: Tuesday, August 28, 2001 4:03 AM
> To: [email protected]
> Subject: [myrinet] Re: Using multiple Myrinet in parallel?
> 
> 
> On Tue, Aug 28, 2001 at 03:55:19PM +0800, geoge_zhang wrote:
> > Hi:
> >    As ee have large-scale parallel applications which require massive
> message passing, We are interested in using multiple Myrinet networks in
> parallel which may increase the communication bandwidth.
> >    Is there any project concerning with the research of this field, and do
> Myrinet hardware and GM support using multiple networks? Or is it possible
> to using multiple Myrinet networks in parallel ?
> >    Any advice or information is appreciated!
> > 
> > 
> 
> A single Myrinet card can surely saturate a PCI bus. So, what do you
> mean with 'multiple in parallel?' You cannot use more than one
> card per host without decreasing their bw.
> 
> -- 
> Francesco P. Lovergine

-- 
Francesco P. Lovergine