[Beowulf] Register article on Linux State of the Union

Joshua Mora joshua_mora at usa.net
Thu Apr 18 09:16:21 PDT 2013


Search on the web for instance "PGAS over Ethernet" to get an idea of where
_some_ of those things are headed.

Joshua

------ Original Message ------
Received: 05:50 PM CEST, 04/18/2013
From: "Douglas Eadline" <deadline at eadline.org>
To: "Hearns, John" <john.hearns at mclaren.com>Cc: "beowulf at beowulf.org"
<beowulf at beowulf.org>
Subject: Re: [Beowulf] Register article on Linux State of the Union

> 
> > http://www.theregister.co.uk/2013/04/17/state_of_linux_2013/
> >
> > Some interesting points from an HPC point of view:
> >
> >
> > "For example, for some kinds of workloads, the NUMA (non-uniform memory
> > access) problem is all-important. This is particularly true of
distributed
> > application clusters. A long as a CPU in a cluster node is working on
data
> > that exists locally, within the node's own memory or storage, processing
> > is fast. But as soon as that CPU needs to access data that exists on some
> > other node in the cluster - data that must pulled across some slow type
of
> > transport, like an Ethernet link - performance can degrade rapidly. Some
> > Linux kernel developers would like to improve the CPU scheduler to handle
> > such situations better."
> 
> I am puzzled by this paragraph. I don't follow the kernel development list
> anymore, but is there some kind of effort to support shared memory
> over Ethernet? I think "degrade rapidly" is a bit of an understatement.
> 
> --
> Doug
> 
> 
> >
> --
> Doug
> 
> -- 
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