<div dir="ltr"><div><div><div><div>Graeme, Nigel,<br><br></div>I would be a little bit worried about Boost threads when it comes to our KNL port of cctbx. In this instance the use of OpenMP or Intel TBB (at least accordingly to Intel docs) would be optimal over boost threads (or pthreads, etc.)[see Intel Xeon Phi High Performance Programming, KNL edition P155 --- no ebook, sorry]. That being said, there is no way to know unless we try it out first, but it isn't something we can test right now.<br><br></div><div>As for Threads vs MP, this again falls into our KNL port, where threads would be better suited (and become a necessity for optimal performance) when running on high-core count devices. If the OpenMP functionality exists, then maybe this would be a more portable way of taking advantage of all cores/hyperthreads.<br></div><div><br></div>In this instance I think turning boost threads on for a build-by-build basis would be better, rather than as a default? Though if I am wrong, feel free to correct me.<br><br></div>Best,<br></div>Lee.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Aug 1, 2017 at 9:36 AM, Nigel Moriarty <span dir="ltr"><<a href="mailto:nwmoriarty@lbl.gov" target="_blank">nwmoriarty@lbl.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Graeme<div><br></div><div>The short answer is "Why?" but that may start a very long discussion. There are a number of multiprocessing modules in easy_mp that seem to cover all the bases. Are there situations where threading is "better" to multiprocessing?</div><div><br></div><div>Articles on multiprocessing in cctbx.</div><div><br></div><div><a href="https://www.phenix-online.org/newsletter/CCN_2017_01.pdf#page=6" target="_blank">https://www.phenix-online.org/<wbr>newsletter/CCN_2017_01.pdf#pag<wbr>e=6</a><div><br></div><div><a href="https://www.phenix-online.org/newsletter/CCN_2013_07.pdf" target="_blank">https://www.phenix-online.org/<wbr>newsletter/CCN_2013_07.pdf</a></div><div><br></div><div><a href="https://www.phenix-online.org/newsletter/CCN_2013_01.pdf" style="font-size:12.8px" target="_blank">https://www.phenix-online.org/<wbr>newsletter/CCN_2013_01.pdf</a><br style="font-size:12.8px"></div></div><div><br></div></div><div class="gmail_extra"><br clear="all"><div><div class="m_5548832614253184202gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr">Cheers<div><br></div><div>Nigel<div><br></div><div>---</div><div>Nigel W. Moriarty<br>Building 33R0349, Molecular Biophysics and Integrated Bioimaging</div><div>Lawrence Berkeley National Laboratory<br>Berkeley, CA 94720-8235<br>Phone : <a href="tel:(510)%20486-5709" value="+15104865709" target="_blank">510-486-5709</a> Email : NWMoriarty@LBL.gov<br>Fax : <a href="tel:(510)%20486-5909" value="+15104865909" target="_blank">510-486-5909</a> Web : <a href="http://CCI.LBL.gov" target="_blank">CCI.LBL.gov</a></div></div></div></div></div></div></div></div><div><div class="h5">
<br><div class="gmail_quote">On Tue, Aug 1, 2017 at 7:54 AM, <span dir="ltr"><<a href="mailto:Graeme.Winter@diamond.ac.uk" target="_blank">Graeme.Winter@diamond.ac.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Afternoon all,<br>
<br>
Should we do this? Any opinions? Could be useful for threads in a semi-portable way...<br>
<br>
Thanks & cheerio Graeme<br>
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