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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">In principle boost threads is all we need – if we *<b>are</b>* calling back from Python then I imagine it would be something like:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">at start of block: read data in Python (as hack)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">split of threads, do many calculations<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">join threads<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">move to next block<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I would hope that anyone who has decided to use threads and uses Python has heard of the GIL, so the fact that this can be a problem should not block us from
enabling boost threads<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">PS we would like this over this side of the pond
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">J</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks & cheerio Graeme<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> cctbxbb-bounces@phenix-online.org [mailto:cctbxbb-bounces@phenix-online.org]
<b>On Behalf Of </b>Billy Poon<br>
<b>Sent:</b> 26 September 2017 23:04<br>
<b>To:</b> cctbx mailing list<br>
<b>Subject:</b> Re: [cctbxbb] Should we enable boost threads in bootstrap?<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Luc,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'm not sure. It was requested and I'm not familiar enough with Python threading. Is this something the data processing folks need? Or is threading in the C++ layer sufficient?<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal">--<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Billy K. Poon</span><o:p></o:p></p>
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<p class="MsoNormal">Research Scientist, Molecular Biophysics and Integrated Bioimaging<o:p></o:p></p>
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<p class="MsoNormal">Lawrence Berkeley National Laboratory<o:p></o:p></p>
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<p class="MsoNormal">1 Cyclotron Road, M/S 33R0345<o:p></o:p></p>
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<p class="MsoNormal">Berkeley, CA 94720<o:p></o:p></p>
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<p class="MsoNormal">Tel: (510) 486-5709<o:p></o:p></p>
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<p class="MsoNormal">Fax: (510) 486-5909<o:p></o:p></p>
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<p class="MsoNormal">Web: <a href="https://phenix-online.org" target="_blank">https://phenix-online.org</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Tue, Sep 26, 2017 at 2:35 PM, Luc Bourhis <<a href="mailto:luc_j_bourhis@mac.com" target="_blank">luc_j_bourhis@mac.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi Billy,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 26 Sep 2017, at 17:11, Billy Poon <<a href="mailto:BKPoon@lbl.gov" target="_blank">BKPoon@lbl.gov</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I just chatted with Tristan Croll from Cambridge at the Phenix developer workshop. Would the Global Interpreter Lock be an issue?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="https://docs.python.org/2.7/c-api/init.html#thread-state-and-the-global-interpreter-lock" target="_blank">https://docs.python.org/2.7/c-api/init.html#thread-state-and-the-global-interpreter-lock</a><o:p></o:p></p>
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<p class="MsoNormal">It sounds like we should be releasing the lock before doing any threading and then reacquiring the lock afterwards.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">So that means you plan your threaded code to call back into Python, then? This would be quite unusual in the context of the cctbx but I haven’t followed development closely for a long while, so I might have missed something.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best wishes,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Luc<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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_______________________________________________<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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