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From: taylanbayirli@gmail.com (Taylan Ulrich =?utf-8?Q?Bay=C4=B1rl=C4=B1?=
	=?utf-8?Q?=2FKammer?=)
Subject: Re: [PATCH] build: Speed up .go compilation.
Date: Sun, 10 Jan 2016 14:34:12 +0100
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In-Reply-To: <87bn8u76tl.fsf@gnu.org> ("Ludovic
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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: guix-devel@gnu.org

ludo@gnu.org (Ludovic Court=C3=A8s) writes:

> taylanbayirli@gmail.com (Taylan Ulrich "Bay=C4=B1rl=C4=B1/Kammer") skribi=
s:
>
>> It should have the same improvement as 'guix pull' since it does
>> basically the same thing.  I measured to make things concrete, and on my
>> machine the run time of 'make -j4' decreases from ~26m to ~6m.
>
> On my 4-core machine, it takes a bit less than 2mn.

OK, this is weird.  Something I did, sadly I don't know anymore what,
seems to have lead to .go files related to Guix's source tree being
cached in my $XDG_CACHE_HOME, after which running 'make -j4' in a clean
(but not newly cloned) repo indeed took only about 3 minutes.  I noticed
from lines like:

;;; note: source file ./guix/config.scm
;;;       newer than compiled /home/taylan/.cache/guile/ccache/2.0-LE-8-2.0=
/home/taylan/src/guix/build/guix/config.scm.go

Could it be that the same is the case for you?

Is this actually normal and I've been missing out the whole time? :-)
Maybe something in my setup/workflow while building guix gets in the way
of proper caching.

Taylan