[Beowulf] Working for DUG, new thead

[Stu Midgley]

Phi is dead... Long live phi...

By which I mean, while the Phi as a chip is going away, its concepts live
on.  Massive number of cores, large vectorisation and high speed memory
(and fucking high heat load - we do ~350W/socket).  So, while the product
code will disappear, phi lives on.

For KNC I did a lot of customisation to MPSS to get it to work... and we
haven't been able to shift from one of the very early version.  We love the
KNC... we get 8 in 2RU which is awesome density (1.1kW/RU)

For KNL its just x86 with a big vectorisation unit (700W/RU).

In both cases you have to be very very careful how you manage memory.



On Thu, Jun 14, 2018 at 10:33 AM Joe Landman <joe.landman at gmail.com> wrote:

> I'm curious about your next gen plans, given Phi's roadmap.
>
> On 6/13/18 9:17 PM, Stu Midgley wrote:
>
> low level HPC means... lots of things.  BUT we are a huge Xeon Phi shop
> and need low-level programmers ie. avx512, careful cache/memory management
> (NOT openmp/compiler vectorisation etc).
>
>
> I played around with avx512 in my rzf code.
> https://github.com/joelandman/rzf/blob/master/avx2/rzf_avx512.c  .  Never
> really spent a great deal of time on it, other than noting that using
> avx512 seemed to downclock the core a bit on Skylake.
>
> Which dev/toolchain are you using for Phi?  I set up the MPSS bit for a
> customer, and it was pretty bad (2.6.32 kernel, etc.).  Flaky control
> plane, and a painful host->coprocessor interface.  Did you develop your
> own?  Definitely curious.
>
>
>
>
>
> On Thu, Jun 14, 2018 at 1:08 AM Jonathan Engwall <
> engwalljonathanthereal at gmail.com> wrote:
>
>> John Hearne wrote:
>> > Stuart Midgley works for DUG?  They are currently
>> > recruiting for an HPC manager in London... Interesting...
>>
>> Recruitment at DUG wants to call me about Low Level HPC. I have at least
>> until 6pm.
>> I am excited but also terrified. My background is C and now JavaScript,
>> mostly online course work and telnet MUDs.
>> Any suggestions are very much needed.
>> What must a "low level HPC" know on day 1???
>> Jonathan Engwall
>> engwalljonathanthereal at gmail.com
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>
>
> --
> Dr Stuart Midgley
> sdm900 at gmail.com
>
>
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>
> --
> Joe Landman
> e: joe.landman at gmail.com
> t: @hpcjoe
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> w: https://scalability.org
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>
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-- 
Dr Stuart Midgley
sdm900 at gmail.com
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