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From: ludo@gnu.org (Ludovic Courtès)
To: Thomas Danckaert <thomas.danckaert@gmail.com>
Cc: guix-devel@gnu.org
Subject: Graft slowness fixed
Date: Mon, 16 Jan 2017 22:18:55 +0100	[thread overview]
Message-ID: <87tw8y66v4.fsf@gnu.org> (raw)
In-Reply-To: <1484159585-12289-1-git-send-email-thomas.danckaert@gmail.com> (Thomas Danckaert's message of "Wed, 11 Jan 2017 19:33:01 +0100")

Hi Thomas,

Thomas Danckaert <thomas.danckaert@gmail.com> skribis:

> There is one issue: when I apply this patch series on current master (after
> commit e10872c gnu: gpgme: Patch CMake files), `guix build kdevelop` seems to
> get stuck after completing the build (at least it doesn't return after running
> at ~100%cpu for over 40minutes, with no output).  When I apply the patch
> series on commit 4d0a3d8 (system: grub: Load relevant EFI modules on EFI
> systems), I don't have this problem.  I'm not sure if this is an issue just on
> my system, or not (I upgraded guix-daemon to lastest master, but the problem
> remains). Hints on how to investigate this are welcome!

You found a terrrrrible issue that somehow went unnoticed for two weeks!

This cute commit:

  http://git.savannah.gnu.org/cgit/guix.git/commit/?id=d38bc9a9f6feefc465964531520fee5663a12f48

had the effect of disabling caching in the DAG traversal performed by
‘graft-derivation’.  For big DAGs like that of kdevelop, you could
really feel it.  :-)

This is fixed by this one-liner:

  http://git.savannah.gnu.org/cgit/guix.git/commit/?id=90ad5c8836138b7fd4d1bd0243dfa8b30ae0cf21

This other one fixes a related issue that had always been there apparently:

  http://git.savannah.gnu.org/cgit/guix.git/commit/?id=0aeed5e310504a9ef2cf6a2b2a7e76086eb8c2fc

Thanks for the heads-up!

Ludo’.

      parent reply	other threads:[~2017-01-16 21:19 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-11 18:33 [PATCH 0/4] kdevelop updates Thomas Danckaert
2017-01-11 18:33 ` [PATCH 1/4] gnu: kdevelop: Update to 5.0.3 Thomas Danckaert
2017-01-16 20:07   ` Ludovic Courtès
2017-01-11 18:33 ` [PATCH 2/4] gnu: kdevelop: Set more paths in wrapper script Thomas Danckaert
2017-01-16 20:09   ` Ludovic Courtès
2017-01-11 18:33 ` [PATCH 3/4] gnu: Add kdev-python Thomas Danckaert
2017-01-16 21:10   ` Ludovic Courtès
2017-01-16 22:39     ` Danny Milosavljevic
2017-01-19 17:14       ` Thomas Danckaert
2017-01-20 13:36         ` Ludovic Courtès
2017-01-11 18:33 ` [PATCH 4/4] gnu: Add python-autopep8 Thomas Danckaert
2017-01-16 21:14   ` Ludovic Courtès
2017-01-16 21:18 ` Ludovic Courtès [this message]

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