On 18 August 2017 at 15:06, Karl Palsson <ka...@tweak.net.au> wrote: > > Bjørn Mork <bj...@mork.no> wrote: >> This looks yucky. Experimenting a bit, I see that the result >> with >> >> a) -T 0 depends on multi-core vs single-core >> b) -T 1 is always different from the output of -T x where x > 1 >> c) -T x where x > 1 is independent of both x and the actual number of >> cores >> >> So you will not get reproducible results with either "-T 0" or >> "-T <value from make -j>". > > Sure, but -T 0 will be ok for _any_ computer with more than one > core. Which is enough of them now, and enough for people doing > builds that care about reproducibility, and certainly enough of > them to appreciate the dramatically sped up builds.
To get this discussion further I, if getting the -j value is far from easy, especially in a portable way (as googling suggest), I suggest adding a config option for enabling parallel XZ compression, either as a bool or directly as a integer for the amount of threads to use, defaulting to n/1. The int option is probably the best as it gives the most control over it. Then those that case about speed can enable it/set it 0, and those that want to use their PC for other things at the same time can leave it at 1 or an appropriate value so it doesn't take over the whole system during compression. Regards Jonas _______________________________________________ Lede-dev mailing list Lede-dev@lists.infradead.org http://lists.infradead.org/mailman/listinfo/lede-dev
