GNU bug report logs - #33643
[PATCH] gnu-build-system: Enable xz to decompress in parallel.

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From: Efraim Flashner <efraim <at> flashner.co.il>
To: Leo Famulari <leo <at> famulari.name>
Cc: 33643 <at> debbugs.gnu.org, Christopher Baines <mail <at> cbaines.net>
Subject: [bug#33643] [PATCH] gnu-build-system: Enable xz to decompress in parallel.
Date: Mon, 10 Dec 2018 20:48:43 +0200

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On Mon, Dec 10, 2018 at 11:24:29AM -0500, Leo Famulari wrote:
> On Sun, Dec 09, 2018 at 04:32:01PM +0200, Efraim Flashner wrote:
> > If the tarball is compressed in parallel then it can be decompressed in
> > parallel.
> 
> The xz documentation says that parallel decompression is not
> implemented? Is that no longer the case?

Looks like I got caught up with the original release notes.
https://git.tukaani.org/?p=xz.git;a=blob;f=NEWS;hb=HEAD#l94
Looks like it's specifically only compression.

> 
> > As for compressing in parallel, it *might work* to pass it through our
> > non-bootstrap tar for 'tar --sort=name' and then pass it through xz
> > -T(pick-a-num).
> 
> That could be helpful!



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