From: Blake McBride <blake@mcbride.name>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] mk time-check/slice issue
Date: Thu, 19 Dec 2013 08:52:48 -0600 [thread overview]
Message-ID: <CABwHSOstuGxuGObq=TYHVb=VzsvWrPnH_iShi_aRh5aCYXS5iA@mail.gmail.com> (raw)
In-Reply-To: <34270f8ddb3fc06e71d4db496a891dd4@brasstown.quanstro.net>
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On Wed, Dec 18, 2013 at 11:40 PM, erik quanstrom <quanstro@quanstro.net>wrote:
>
>
> to be more explicit. if a is built from b and mtime(a) <= mtime(b), then
> mk could fail to rebuild a when it needs to. for correctness, mk must
> use <=
> not <.
>
I was thinking about the problem and actually, at least in all
circumstances I can think of, changing that one operation from <= to <
would fix the problem. If the times are on the same second, I would never
have had time to change it. This would fix the problem. Perhaps this
functionality can be controlled by an environment variable like NPROC.
I think this is important as follows. If you are working on a project,
edit some files, and then perform a mk, if files you haven't changed get
built, I for one would constantly question myself, about whether or not I
changed that file. It would make things confusing. Also, and perhaps more
importantly, it may occur that a very long build is dependant on a very
short preceding build. So, the unnecessary rebuild of the fast process can
unnecessarily trigger the very long process. This really needs addressing
for that reason especially IMO.
Thanks.
Blake
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next prev parent reply other threads:[~2013-12-19 14:52 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-18 22:01 Blake McBride
2013-12-18 22:08 ` Matthew Veety
2013-12-18 22:42 ` Blake McBride
2013-12-18 22:16 ` erik quanstrom
2013-12-18 22:46 ` Blake McBride
2013-12-19 5:40 ` erik quanstrom
2013-12-19 6:07 ` Bakul Shah
2013-12-19 10:59 ` Charles Forsyth
2013-12-19 14:21 ` Oleksandr Iakovliev
2013-12-19 14:58 ` erik quanstrom
2013-12-19 14:52 ` Blake McBride [this message]
2013-12-19 14:55 ` erik quanstrom
2013-12-19 15:58 ` Blake McBride
2013-12-19 16:30 ` Tristan
2013-12-19 16:37 ` Blake McBride
2013-12-19 16:40 ` Jacob Todd
2013-12-19 17:05 ` Blake McBride
2013-12-19 17:24 ` Tristan
2013-12-19 18:30 ` Blake McBride
2013-12-19 17:59 ` Steffen Daode Nurpmeso
2013-12-19 17:07 ` a
2013-12-19 18:40 ` Blake McBride
2013-12-19 18:58 ` Kurt H Maier
2013-12-19 19:06 ` Matthew Veety
2013-12-19 19:07 ` Kurt H Maier
2013-12-19 19:20 ` Blake McBride
2013-12-19 19:27 ` Kurt H Maier
2013-12-19 19:42 ` Blake McBride
2013-12-19 20:02 ` Kurt H Maier
2013-12-19 20:18 ` erik quanstrom
2013-12-19 20:23 ` Kurt H Maier
2013-12-19 19:35 ` a
2013-12-19 19:09 ` a
2013-12-27 10:16 ` dexen deVries
2013-12-19 19:09 ` erik quanstrom
2013-12-19 19:29 ` Blake McBride
2013-12-19 19:39 ` Gabriel Diaz
2013-12-19 20:15 ` Richard Miller
2013-12-19 20:28 ` Blake McBride
2013-12-19 20:45 ` Richard Miller
2013-12-20 15:23 ` Aram Hăvărneanu
2013-12-19 19:12 ` Skip Tavakkolian
2013-12-19 19:22 ` Blake McBride
2013-12-19 19:43 ` Rudolf Sykora
2013-12-19 19:58 ` Blake McBride
2013-12-19 19:26 ` sl
2013-12-19 10:01 ` Richard Miller
2013-12-19 15:01 ` erik quanstrom
[not found] <CAC0DbM5safEHO_MFpBazvvH6CcGQXGTow-Fe7fkqkP6GrU1Xzw@mail.gmail.com>
[not found] ` <CAC0DbM7S-xZvOSDwB6KoWH2X8ny_57F9mBE7gaB_BuWR5RSJiw@mail.gmail.com>
2013-12-18 23:09 ` Jason Catena
2013-12-19 5:47 ` erik quanstrom
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