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bug#27284: [PATCH 1/8] build: Factorize module compilation in (guix buil

From: Ludovic Courtès
Subject: bug#27284: [PATCH 1/8] build: Factorize module compilation in (guix build compile).
Date: Sun, 22 Oct 2017 19:51:14 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)


Eric Bavier <address@hidden> skribis:

> And from NEWS for the 4.2 release:
> * The amount of parallelism can be determined by querying MAKEFLAGS, even when
>   the job server is enabled (previously MAKEFLAGS would always contain only
>   "-j", with no number, when job server was enabled).

Thanks for digging!  I didn’t expect such things to ever change.

> It Would Be Nice if the functionality worked for older versions of make
> that people might have on their systems.

With the patch I posted, Scheme compilation would always use one thread
per core, which is what it currently does in ‘master’.

That’s in argument in favor of the lazy in me: it’s an improvement for
people using a reasonably recent system, and it’s not a regression for
the others!  :-)


> Using the jobserver directly would require quite a bit of work for the
> current patch set, but I wonder if there is another way to determine
> the -jN parameter for make<4.2 that we could use.  Maybe simply
> polling the jobserver fds at the start?

AIUI the job server does not reveal how many jobs are allowed.  It
merely grants you an execution token.

Or did you have something else in mind?


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