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Re: Improving parallel build (was: [C++/Obj-C++ PATCH] Fix Objective-C++ breakage)
On Sun, Mar 30, 2008 at 4:37 PM, Ralf Wildenhues <Ralf.Wildenhues@gmx.de> wrote:
> [ trimming Cc: list ]
>
> Hello Richard,
>
[...]
> $ make clean; \time make -j8
> 882.91user 24.80system 2:19.52elapsed 650%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (0major+6283548minor)pagefaults 0swaps
>
> Note that it's really the order-only prerequisite that makes the job
> number matter: without the patch below, -j8 is as fast as -j20.
>
> I do not know if this patch could also trigger the make bug that
> prevented automatic dependency tracking, but I haven't been able
> to get make to hang with some casual testing.
Heh, that's a pretty big savings for a small patch :)
Thanks,
Richard.