[Beowulf] Rackable / SGI

Glen Beane Glen.Beane at jax.org
Fri Apr 3 19:20:32 EDT 2009



________________________________________
From: beowulf-bounces at beowulf.org [beowulf-bounces at beowulf.org] On Behalf Of Greg Lindahl [lindahl at pbm.com]
Sent: Friday, April 03, 2009 4:32 PM
To: beowulf at beowulf.org
Subject: Re: [Beowulf] Rackable / SGI

On Fri, Apr 03, 2009 at 08:47:42AM +0200, Eugen Leitl wrote:
> On Fri, Apr 03, 2009 at 07:34:26AM +0800, Stuart Midgley wrote:
>
> > In 2019 when Intel releases their 1024core chip, still at 2.5GHz with
> > 256GB dimm memory, a lot of people will be surprised that linux works
>
> Ain't going to work. Arguably doesn't work already beyond 8 cores
> in a single socket.
>
> Will have to do with embedded memory or stacked 3d memory a la
> http://www.cc.gatech.edu/~loh/Papers/isca2008-3Ddram.pdf

We've been building bigger and bigger SMPs for a long time, making
changes to improve the memory system as needed. How is multicore any
different?

memory bandwidth?  The number of cores on a single CPU is growing much faster than the memory bandwidth to that CPU, right?

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