Am 01.09.2016 um 18:22 schrieb Markus Heiser <markus.heiser@xxxxxxxxxxx>: > > Am 01.09.2016 um 16:29 schrieb Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>: > >> On Thu, 01 Sep 2016, Jonathan Corbet <corbet@xxxxxxx> wrote: >>> On Wed, 24 Aug 2016 15:35:24 +0200 >>> Markus Heiser <markus.heiser@xxxxxxxxxxx> wrote: >>> >>>> With metadata "parallel_read_safe = True" a extension is marked as >>>> save for "parallel reading of source". This is needed if you want >>>> build in parallel with N processes. E.g.: >>>> >>>> make SPHINXOPTS=-j4 htmldocs >>> >>> A definite improvement; applied to the docs tree, thanks. >> >> The Sphinx docs say -jN "should be considered experimental" [1]. Any >> idea *how* experimental that is, really? Could we add some -j by >> default? > > My experience is, that parallel build is only strong on "reading > input" and weak on "writing output". I can't see any rich performance > increase on more than -j2 ... > > Mauro posted [2] his experience with -j8 compared to serial. He > also compares -j8 to -j16: > >> PS: on my server with 16 dual-thread Xeon CPU, the gain with a >> bigger value for -j was not impressive. Got about the same time as >> with -j8 or -j32 there. > > I guess he will get nearly the same results with -j2 ;) > > If we want to add a -j default, I suggest -j2. > > [2] https://www.mail-archive.com/linux-doc%40vger.kernel.org/msg05552.html > > -- Markus -- > Sorry, forget to mentioning, that there has been some improvements to parallel build in Sphinx 1.3 compared to 1.2. But in 1.3.2 they have also fixed a bug which lets parallel builds hang :-o https://github.com/sphinx-doc/sphinx/blob/master/CHANGES#L665 This in mind and if we really support down to sphinx 1.2 ... we should not use any -j default. IMHO we should get rid of this sphinx 1.2. downward compatibility, it makes so may problems (e.g. see [3]) ... but we have discussed this already and I don't want to restart this thread ;-) [3] https://www.mail-archive.com/linux-doc%40vger.kernel.org/msg05695.html -- Markus -- > >> BR, >> Jani. >> >> >> [1] http://www.sphinx-doc.org/en/stable/invocation.html#invocation-of-sphinx-build >> >> -- >> Jani Nikula, Intel Open Source Technology Center > > -- > To unsubscribe from this list: send the line "unsubscribe linux-doc" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
