Re: SMP scalability: 8 -> 32 CPUs

Liran Zvibel (liranz@math.tau.ac.il)
Wed, 2 Dec 1998 02:09:32 +0200 (GMT+0200)


On Mon, 30 Nov 1998, Henrik Olsen wrote:

> On Mon, 30 Nov 1998, Stephen C. Tweedie wrote:
>
> > Hi,
> >
> > On Sun, 29 Nov 1998 16:45:17 -0500 (GMT), ramak@wipinfo.soft.net
> > (Ramakrishna K) said:
> >
> > > Also just a general question from curiosity perspective, is the
> > > performance of a cluster of these boxes better than a say 1024
> > > way SMP box. This is assuming we are able to scale it to say 1024
> > > CPUs. This is vis-a-vis compared to a cluster involving SMP boxes
> > > ( totally adding upto 1024 CPU's ).
> >
> > You simply cannot answer a question like that! Let me restate your
> > question:
> >
> > "Let's assume that we invent some mechanism for binding 1024
> > cpus into a single box. I know it doesn't exist yet, but how
> > fast will it be?"
> >
> > Binding that many CPUs together is hard! You tell me how you plan to do
> > it, and _then_ I'll tell you whether clustering is faster. :)
> >
> > --Stephen
If I'm not mistaken, on my last trip to SGI, they told me that they could
put up to 2048 processors in their machines.

I'll have to check that, but I'm 99% sure it is true.

Liran.

---
http://www.math.tau.ac.il/~liranz/

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