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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Thanks for the replies<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">You can see configure times on our dashboard (switch to advanced view):
<a href="https://dash.orfeo-toolbox.org/index.php?project=OTB">https://dash.orfeo-toolbox.org/index.php?project=OTB</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">It ranges from 1-3min. There's even one windows machine that's at 4m30s.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Thanks for the tip about Ninja generator, it's indeed much faster. But switching the entire dev team + CI servers from make to ninja
is not really an option for us right now because of a bug in ninja that affects our SuperBuild configuration (see here if you're interested in the details:
<a href="https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb/issues/1625">https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb/issues/1625</a>)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Victor Poughon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">De :</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Eric Noulard <eric.noulard@gmail.com>
<br>
<b>Envoyé :</b> mercredi 14 novembre 2018 11:12<br>
<b>À :</b> Poughon Victor <Victor.Poughon@cnes.fr><br>
<b>Cc :</b> CMake Mailinglist <cmake@cmake.org><br>
<b>Objet :</b> Re: [CMake] Tips on reducing configure time<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hi Victor,<o:p></o:p></p>
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<p class="MsoNormal">Le mer. 14 nov. 2018 à 10:20, Poughon Victor <<a href="mailto:Victor.Poughon@cnes.fr">Victor.Poughon@cnes.fr</a>> a écrit :<o:p></o:p></p>
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<p class="MsoNormal">Hi all<br>
<br>
I am working on a large C++ project using CMake (<a href="https://www.orfeo-toolbox.org/" target="_blank">https://www.orfeo-toolbox.org/</a>) and our 'configure' step takes quite a lot of time. This can be annoying for developers working on features where the
configure step needs to be re-run, or for CI in general. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Could you give us a clue on "takes quite a lot of time"?<o:p></o:p></p>
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<p class="MsoNormal">Are we speaking of tens of seconds, minutes etc... ?<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><br>
We have looked into it a bit and it seems like one issue is that the configure/generate steps do a lot of small files I/O. Specifically, using:<br>
<br>
inotofy-wait -mr <build_dir><br>
<br>
shows that "cmake ." causes about 150K file access/modify, etc. There are some especially guilty looking files like 'Makefile2.tmp' or 'progress.tmp' that appear thousands of times in most of the log file.<br>
<br>
I have an SSD which somewhat helps, but for colleagues still on mechanical drives this is especially painful. Is there a way to disable writing all those files to the disk?<br>
<br>
Any other tips on optimizing the performance of 'cmake .'?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Did you try to test drive a switch to ninja generator ?<o:p></o:p></p>
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<p class="MsoNormal">Ninja generator generates only two files (build.ninja and rules.ninja) you won't have the "mny small files issue".<o:p></o:p></p>
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<p class="MsoNormal">You can have long configuration times as well but not coming from file access.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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Thanks,<br>
<br>
Victor Poughon<br>
<br>
<br>
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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">-- <o:p></o:p></p>
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<p class="MsoNormal">Eric<o:p></o:p></p>
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