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From: ludo@gnu.org (Ludovic Courtès)
To: 宋文武 <iyzsong@member.fsf.org>
Cc: guix-devel <guix-devel@gnu.org>
Subject: Re: ‘core-updates’ is back!
Date: Wed, 30 Aug 2017 11:58:35 +0200	[thread overview]
Message-ID: <87h8wp4bsk.fsf@gnu.org> (raw)
In-Reply-To: <87378av6lx.fsf@member.fsf.org> ("宋文武"'s message of "Tue, 29 Aug 2017 21:36:10 +0800")

iyzsong@member.fsf.org (宋文武) skribis:

> Andy Wingo <wingo@igalia.com> writes:
>
>> On Tue 29 Aug 2017 00:01, ludo@gnu.org (Ludovic Courtès) writes:
>>
>>> Yup, I just created a new ‘core-updates’ branch by pushing
>>> <https://bugs.gnu.org/27849>.  Enjoy!
>>>
>>> Let’s freeze in one month, say Oct. 1st?
>>
>> It would be pretty cool if we could fix our O(n^2) problems in search
>> paths in this core-updates -- basically whenever you go to create an
>> environment, instead of making e.g. VAR=A:B:C:..., for all VARs
>> (LIBRARY_PATH, PKG_CONFIG_PATH, etc), instead we make a union directory
>> Z containing the union of A, B, C, etc and set VAR=Z.  The goal would be
>> to fix quadratic run-time lookup costs by replacing it with a
>> compile-time computation.  This applies to many lookups: PATH, -rpath,
>> etc.
>
> The runtime references scanner of daemon will be inefficient if the
> union gets recorded with all the inputs contained, and we likely won't
> apply this to packages with multiple outputs (eg: fcitx) which will make
> every output including the union into its runtime reference.

Indeed, good point.

Ludo’.

  reply	other threads:[~2017-08-30  9:58 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-28 22:01 ‘core-updates’ is back! Ludovic Courtès
2017-08-29  8:44 ` Efraim Flashner
2017-08-30  9:30   ` Efraim Flashner
2017-08-30 19:10     ` Marius Bakke
2017-08-30 20:16       ` Efraim Flashner
2017-08-30 20:37         ` Marius Bakke
2017-08-31 14:44           ` Ludovic Courtès
2017-08-31 16:23             ` Marius Bakke
2017-08-31 17:18               ` Marius Bakke
2017-09-02 11:18                 ` Marius Bakke
2017-09-02 21:01               ` Ludovic Courtès
2017-08-30 21:17       ` Ricardo Wurmus
2017-08-30 21:51         ` Marius Bakke
2017-08-29  9:14 ` Andy Wingo
2017-08-29 10:01   ` Ricardo Wurmus
2017-08-29 13:36   ` 宋文武
2017-08-30  9:58     ` Ludovic Courtès [this message]
2017-08-30  9:58   ` Ludovic Courtès
2017-09-05 13:21     ` Ricardo Wurmus
2017-09-05 14:57       ` bug#26048: " Ludovic Courtès

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