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From: ludo@gnu.org (Ludovic Courtès)
To: Marius Bakke <mbakke@fastmail.com>
Cc: 31015@debbugs.gnu.org
Subject: [bug#31015] [PATCH] packages, scripts, utils: Respect (parallel-job-count) when xz-compressing.
Date: Wed, 04 Apr 2018 13:42:01 +0200	[thread overview]
Message-ID: <877epnfbau.fsf@gnu.org> (raw)
In-Reply-To: <20180401125431.11996-1-mbakke@fastmail.com> (Marius Bakke's message of "Sun, 1 Apr 2018 14:54:31 +0200")

Hello!

Marius Bakke <mbakke@fastmail.com> skribis:

> * guix/packages.scm (patch-and-repack): When invoking 'xz', tell it to use the
> amount of cores specified by e.g. 'guix build -c'.
> * guix/scripts/pack.scm (%compressors, bootstrap-xz): Likewise.  While at it,
> use the long form '--threads=' for clarity.
> * guix/utils.scm (decompressed-port, compressed-port, compressed-output-port):
> Likewise.

Wasn’t there an issue that parallel xz is non-deterministic?  I vaguely
remember something like this when we were producing with glibc tarballs
out of the Git repo.

If so, we should instead use -T1, even if that means getting worse
performance (I hear that lzip “works better” than xz, so we should give
it a try if we want both performance and good compression.)

Besides, the guix/packages.scm part would lead to a full rebuild, so I
think it’s a bit late for ‘core-updates’.

Thanks,
Ludo’.

  reply	other threads:[~2018-04-04 11:43 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-01 12:54 [bug#31015] [PATCH] packages, scripts, utils: Respect (parallel-job-count) when xz-compressing Marius Bakke
2018-04-04 11:42 ` Ludovic Courtès [this message]
2018-05-13 20:37   ` Ludovic Courtès

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