<div dir="ltr">Phi is dead... Long live phi...<div><br></div><div>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.</div><div><br></div><div>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)</div><div><br></div><div>For KNL its just x86 with a big vectorisation unit (700W/RU).</div><div><br></div><div>In both cases you have to be very very careful how you manage memory.</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Thu, Jun 14, 2018 at 10:33 AM Joe Landman <<a href="mailto:joe.landman@gmail.com">joe.landman@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p>I'm curious about your next gen plans, given Phi's roadmap.<br>
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<div class="m_-3959507225315490953moz-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="m_-3959507225315490953moz-txt-link-freetext" href="https://github.com/joelandman/rzf/blob/master/avx2/rzf_avx512.c" target="_blank">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>
<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" target="_blank">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">engwalljonathanthereal@gmail.com</a></p>
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-- <br>
<div dir="ltr" class="m_-3959507225315490953gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">Dr Stuart Midgley<br>
<a href="mailto:sdm900@gmail.com" target="_blank">sdm900@gmail.com</a></div>
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<pre class="m_-3959507225315490953moz-signature" cols="72">--
Joe Landman
e: <a class="m_-3959507225315490953moz-txt-link-abbreviated" href="mailto:joe.landman@gmail.com" target="_blank">joe.landman@gmail.com</a>
t: @hpcjoe
c: +1 734 612 4615
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g: <a class="m_-3959507225315490953moz-txt-link-freetext" href="https://github.com/joelandman" target="_blank">https://github.com/joelandman</a>
l: <a class="m_-3959507225315490953moz-txt-link-freetext" href="https://www.linkedin.com/in/joelandman" target="_blank">https://www.linkedin.com/in/joelandman</a>
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</blockquote></div><br clear="all"><div><br></div>-- <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">sdm900@gmail.com</a></div></div>