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Subject: Re: [hwloc-users] lstopo and GPus
From: Gabriele Fatigati (g.fatigati_at_[hidden])
Date: 2012-08-28 12:09:59


Hi,

thanks for the reply.

How can cuda branch help me? lstopo output of that branch is the same of
the trunk.

Another question: the GPU IDs are the same (10de: 06d2). How is it possible?

Thanks.

2012/8/28 Samuel Thibault <samuel.thibault_at_[hidden]>

> Brice Goglin, le Tue 28 Aug 2012 14:43:53 +0200, a écrit :
> > > $ lstopo
> > > Socket #0
> > > Socket #1
> > > PCI...
> > > (connected to socket #1)
> > >
> > > vs
> > >
> > > $ lstopo
> > > Socket #0
> > > Socket #1
> > > PCI...
> > > (connected to both sockets)
> >
> > Fortunately, this won't occur in most cases (including Gabriele's
> > machines) because there's a NUMAnode object above each socket.
>
> Oops, I actually meant NUMAnode above
>
> > Both the socket and the PCI bus are drawn inside the NUMA box, so
> > things appear OK in graphics to.
>
> Indeed, if the PCI bus was connected to one NUMAnode/socket only, it
> would be drawn inside, which is not the case.
>
> > Gabriele, assuming you have a dual Xeon X56xx Westmere machine, there
> > are plenty of such platforms where the GPU is indeed connected to both
> > sockets. Or it could be a buggy BIOS.
>
> Agreed.
>
> Samuel
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-- 
Ing. Gabriele Fatigati
HPC specialist
SuperComputing Applications and Innovation Department
Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
www.cineca.it                    Tel:   +39 051 6171722
g.fatigati [AT] cineca.it