[Beowulf] single machine with 500 GB of RAM

John Hearns hearnsj at googlemail.com
Wed Jan 9 04:53:41 PST 2013


You will need to populate all of the CPU sockets if you are filing all the
DIMM slots.
So yoy probably need more than one CPU
On Jan 9, 2013 12:42 PM, "Jörg Saßmannshausen" <j.sassmannshausen at ucl.ac.uk>
wrote:
>
> Dear all,
>
> Happy New Year!
>
> I was wondering whether people on the list here have some first hand
> experiences with this. I have been asked to purchase a single machine with
> around 500 GB of RAM. We would not need more than 8 cores here. The job
simply
> needs that much of memory (and even then it is running for 14 days).
>
> Now, with that amount of memory used by a single core, I would have
thought
> that I need a fast memory interconnect, i.e. a high memory bandwidth. I
was
> thinking of getting an Intel Sandybridge CPU (maybe a  E5-2650) for that
> machine and get a motherboard with can cope with that amount of memory.
Does
> anybody happen to have some recommendations here or knows of potential
> pitfalls?
>
> Also, in a related problem, how would I set the kernel.shmmni,
kernel.shmall
> and kernel.shmmax values so I am not running out of memory handles here.
I am
> still confused by that.
>
> Any kind of advice here is much appreciated. Given it is an expensive
piece of
> hardware we want to purchase I want to get it right.
>
> All the best from a grey London
>
> Jörg
>
> --
> *************************************************************
> Jörg Saßmannshausen
> University College London
> Department of Chemistry
> Gordon Street
> London
> WC1H 0AJ
>
> email: j.sassmannshausen at ucl.ac.uk
> web: http://sassy.formativ.net
>
> Please avoid sending me Word or PowerPoint attachments.
> See http://www.gnu.org/philosophy/no-word-attachments.html
>
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