Actually, I think he meant: "j argument present but not set". Such as "make -j". And yes, that should automagically use all available cores.
On Fri, Jul 16, 2010 at 2:49 PM, Carter, Nathan <ncar...@bentley.edu> wrote: > > On Jul 15, 2010, at 9:49 PM, Coda Highland wrote: > > > I can't imagine why Creator couldn't guess at a default value anyway; > > just ask QThreadPool what the ideal number of threads is. :P > > Actually, if Creator can do it with QThreadPool, why can't qmake do it with > QThreadPool? Then my Makefile would always have the right -j argument for > the machine it was created on. > > > On Jul 16, 2010, at 6:29 AM, Danny Price wrote: > > > I used to do that but the setting is lost when the pro.user file is > regenerated. Is there a way to set this in the .pro file? > > Yes, but even better, let's have it as the default behavior for qmake to > choose a -j N argument for make, but you can override it if you'd rather not > use all cores or something like that. > > > > Doesn't make automatically use all available cores if the 'j' argument is > not set? I'm sure I read that somewhere. > > No, here's what I just tried on my 4-core system with one > small/medium-sized Qt project: > > make clean ; time make > Time: 1m10s > Activity monitor showed: > Two cores nearly unused the whole time > Other two partially used the whole time (up+down) > > make clean ; time make -j 2 > Time: 42s > Activity monitor showed: > Two cores only slightly (30%?) used the whole time > Other two maxed out the whole time > > make clean ; time make -j 4 > Time: 34s > Activity monitor showed: > All four cores maxed out the whole time > > So make does not guess correctly from the point of view of "please finish > as fast as possible." > > Nathan > > > _______________________________________________ > Qt-creator mailing list > Qt-creator@trolltech.com > http://lists.trolltech.com/mailman/listinfo/qt-creator > -- Aurélien Vallée +33 6 47 41 70 37
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