Efraim Flashner <efr...@flashner.co.il> writes: > While rebuilding glibc-final on aarch64 I realized that the 'strip > phase took 235 seconds. The relevant code for 'strip from > gnu-build-system is in guix/build/gnu-build-system.scm, starting at > line 340, with the actual stripping starting at 398. When I changed > 'for-each' to 'par-for-each' the time dropped from 235 seconds to 215, > about an 8.5% savings. I'm pretty sure most of that time was spent > failing to strip certain files, but it is still a savings.
Nice!
>
> I'm guessing there are other parts that can be parallelized in a
> similar manner.
>
> As for par-for-each (as many threads as cores on the machine) vs
> n-par-for-each (n threads), I think it would be better to use
> n-par-for-each, but I didn't quickly see a way to limit based on the
> number of cores offered to each builder.
I think you want parallel-job-count in (guix build utils):
(define parallel-job-count
;; Number of processes to be passed next to GNU Make's `-j' argument.
(make-parameter
(match (getenv "NIX_BUILD_CORES") ;set by the daemon
(#f 1)
("0" (current-processor-count))
(x (or (string->number x) 1)))))
--
Chris
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