[Beowulf] Register article on Linux State of the Union

Douglas Eadline deadline at eadline.org
Thu Apr 18 08:50:01 PDT 2013


> 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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