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<div class="moz-cite-prefix">On 06/13/2018 10:32 PM, Joe Landman
wrote:<br>
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<p>I'm curious about your next gen plans, given Phi's roadmap.<br>
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<div class="moz-cite-prefix">On 6/13/18 9:17 PM, Stu Midgley
wrote:<br>
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<div dir="ltr">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).</div>
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I played around with avx512 in my rzf code. <a
class="moz-txt-link-freetext"
href="https://github.com/joelandman/rzf/blob/master/avx2/rzf_avx512.c"
moz-do-not-send="true">https://github.com/joelandman/rzf/blob/master/avx2/rzf_avx512.c</a>
. 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. <br>
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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? <br>
<blockquote type="cite"
cite="mid:47521674-3bd5-ab13-8e02-3aabea68e064@gmail.com"> <br>
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.<br>
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<div dir="ltr">On Thu, Jun 14, 2018 at 1:08 AM Jonathan
Engwall <<a
href="mailto:engwalljonathanthereal@gmail.com"
moz-do-not-send="true">engwalljonathanthereal@gmail.com</a>>
wrote:<br>
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<p dir="ltr">John Hearne wrote:<br>
> Stuart Midgley works for DUG? They are currently<br>
> recruiting for an HPC manager in London...
Interesting...</p>
<p dir="ltr">Recruitment at DUG wants to call me about Low
Level HPC. I have at least until 6pm.<br>
I am excited but also terrified. My background is C and
now JavaScript, mostly online course work and telnet MUDs.<br>
Any suggestions are very much needed.<br>
What must a "low level HPC" know on day 1???<br>
Jonathan Engwall<br>
<a href="mailto:engwalljonathanthereal@gmail.com"
target="_blank" moz-do-not-send="true">engwalljonathanthereal@gmail.com</a></p>
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-- <br>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr">Dr Stuart Midgley<br>
<a href="mailto:sdm900@gmail.com" target="_blank"
moz-do-not-send="true">sdm900@gmail.com</a></div>
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<pre class="moz-signature" cols="72">--
Joe Landman
e: <a class="moz-txt-link-abbreviated" href="mailto:joe.landman@gmail.com" moz-do-not-send="true">joe.landman@gmail.com</a>
t: @hpcjoe
c: +1 734 612 4615
w: <a class="moz-txt-link-freetext" href="https://scalability.org" moz-do-not-send="true">https://scalability.org</a>
g: <a class="moz-txt-link-freetext" href="https://github.com/joelandman" moz-do-not-send="true">https://github.com/joelandman</a>
l: <a class="moz-txt-link-freetext" href="https://www.linkedin.com/in/joelandman" moz-do-not-send="true">https://www.linkedin.com/in/joelandman</a>
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