[Beowulf] Working for DUG, new thead

[Prentice Bisbal]

On 06/13/2018 10:32 PM, Joe Landman 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.

If you organize your code correctly, and call the compiler with the 
right optimization flags, shouldn't the compiler automatically handle a 
good portion of this 'low-level' stuff? I understand that hand-coding 
this stuff usually still give you the best performance (See 
GotoBLAS/OpenBLAS, for example), but does your average HPC programmer 
trying to get decent performance need to hand-code that stuff, too?
>
> 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 
>> <mailto: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
>>     <mailto:engwalljonathanthereal at gmail.com>
>>
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>>
>>
>> -- 
>> Dr Stuart Midgley
>> sdm900 at gmail.com <mailto:sdm900 at gmail.com>
>>
>>
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>
> -- 
> Joe Landman
> e:joe.landman at gmail.com
> t: @hpcjoe
> c: +1 734 612 4615
> w:https://scalability.org
> g:https://github.com/joelandman
> l:https://www.linkedin.com/in/joelandman
>
>
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