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From: Jeff King <peff@peff.net>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: "Taylor Blau" <me@ttaylorr.com>,
	git@vger.kernel.org, "Junio C Hamano" <gitster@pobox.com>,
	"Johannes Sixt" <j6t@kdbg.org>,
	"Øystein Walle" <oystwa@gmail.com>
Subject: Re: [PATCH 0/8] Makefile: make command-list.h 2-5x as fast with -jN
Date: Wed, 20 Oct 2021 19:46:45 -0400	[thread overview]
Message-ID: <YXCqO7WFET6J7gGf@coredump.intra.peff.net> (raw)
In-Reply-To: <211021.86v91rmftn.gmgdl@evledraar.gmail.com>

On Thu, Oct 21, 2021 at 01:14:37AM +0200, Ævar Arnfjörð Bjarmason wrote:

> Jeff: Just in terms of error prone both of these implementations will
> accept bad input that's being caught in 8/8 of this series.
> 
> We accept a lot of bad input now, ending up with some combinations of
> bad output or compile errors if you screw with the input *.txt files. I
> think I've addressed all of those in this series.

I don't mind more error-checking, though TBH I don't find a huge value
in it. But what I did mean was:

> If you mean the general concept of making a "foo.gen" from a "foo.txt"
> as an intermediate with make as a way to get to "many-foo.h" I don't
> really see how it's error prone conceptually. You get error checking
> each step of the way, and it encourages logic that's simpler each step
> of the way.

Yes. It just seems like the Makefile gets more complicated, and
sometimes that can lead to subtle dependency issues (e.g., the ".build"
dependency in the earlier iteration of the series).

And in general I'd much rather debug an awk script than a Makefile.

> Per Eric's Sunshine's upthread comments an awk and Perl implementation
> were both considered before[1].

Ah sorry, I thought it was just a perl one that had been the
show-stopper. I hadn't noticed the awk one. However, the point of my
patch was to use perl if available, and fall back otherwise. Maybe
that's too ugly, but it does address the concern with Eric's
implementation.

> I.e. I think if you e.g. touch Documentation/git-a*.txt with this series
> with/without this awk version the difference in runtime is within the
> error bars. I.e. making the loop faster isn't necessary. It's better to
> get to a point where make can save you from doing all/most of the work
> by checking modification times, rather than making an O(n) loop faster.

FWIW, I don't agree with this paragraph at all. Parallelizing or reusing
partial results is IMHO inferior to just making things faster.

> I'm also interested in (and have WIP patches for) simplifying things
> more generally in the Makefile. Once we have a file exploded out has
> just the synopsis line that can be used to replace what's now in
> Documentation/cmd-list.perl, i.e. those summary blurbs also end up in
> "man git".
> 
> There's subtle dependency issues there as well, and just having a
> one-off solution for the the command-list.h doesn't get us closer to
> addressing that sibling implementation.

So I don't know what "subtle dependency issues" you found here, but this
is exactly the kind of complexity it was my goal to avoid.

-Peff

  reply	other threads:[~2021-10-20 23:46 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-24 13:16 Why the Makefile is so eager to re-build & re-link Ævar Arnfjörð Bjarmason
2021-06-24 15:16 ` Jeff King
2021-06-24 15:28   ` Ævar Arnfjörð Bjarmason
2021-06-24 21:30   ` Johannes Sixt
2021-06-25  8:34     ` Ævar Arnfjörð Bjarmason
2021-06-25  9:01       ` Ævar Arnfjörð Bjarmason
2021-06-29  2:13       ` Jeff King
2021-10-20 18:39         ` [PATCH 0/8] Makefile: make command-list.h 2-5x as fast with -jN Ævar Arnfjörð Bjarmason
2021-10-20 18:39           ` [PATCH 1/8] command-list.txt: sort with "LC_ALL=C sort" Ævar Arnfjörð Bjarmason
2021-10-20 18:39           ` [PATCH 2/8] generate-cmdlist.sh: trivial whitespace change Ævar Arnfjörð Bjarmason
2021-10-20 18:39           ` [PATCH 3/8] generate-cmdlist.sh: spawn fewer processes Ævar Arnfjörð Bjarmason
2021-10-20 18:39           ` [PATCH 4/8] generate-cmdlist.sh: don't call get_categories() from category_list() Ævar Arnfjörð Bjarmason
2021-10-20 18:39           ` [PATCH 5/8] generate-cmdlist.sh: run "grep | sort", not "sort | grep" Ævar Arnfjörð Bjarmason
2021-10-20 18:39           ` [PATCH 6/8] generate-cmdlist.sh: replace for loop by printf's auto-repeat feature Ævar Arnfjörð Bjarmason
2021-10-21 14:42             ` Jeff King
2021-10-21 16:25               ` Jeff King
2021-10-20 18:39           ` [PATCH 7/8] Makefile: stop having command-list.h depend on a wildcard Ævar Arnfjörð Bjarmason
2021-10-21 14:45             ` Jeff King
2021-10-21 18:24               ` Junio C Hamano
2021-10-21 22:46             ` Øystein Walle
2021-10-20 18:39           ` [PATCH 8/8] Makefile: assert correct generate-cmdlist.sh output Ævar Arnfjörð Bjarmason
2021-10-20 20:35           ` [PATCH 0/8] Makefile: make command-list.h 2-5x as fast with -jN Jeff King
2021-10-20 21:31             ` Taylor Blau
2021-10-20 23:14               ` Ævar Arnfjörð Bjarmason
2021-10-20 23:46                 ` Jeff King [this message]
2021-10-21  0:48                   ` Ævar Arnfjörð Bjarmason
2021-10-21  2:20                     ` Taylor Blau
2021-10-22 12:37                       ` Ævar Arnfjörð Bjarmason
2021-10-21 14:34                     ` Jeff King
2021-10-21 22:34                       ` Junio C Hamano
2021-10-22 10:51                       ` Ævar Arnfjörð Bjarmason
2021-10-22 18:31                         ` Jeff King
2021-10-22 20:50                           ` Ævar Arnfjörð Bjarmason
2021-10-21  5:39                 ` Eric Sunshine
2021-10-22 19:36           ` [PATCH v2 00/10] Makefile: make generate-cmdlist.sh much faster Ævar Arnfjörð Bjarmason
2021-10-22 19:36             ` [PATCH v2 01/10] command-list.txt: sort with "LC_ALL=C sort" Ævar Arnfjörð Bjarmason
2021-10-25 18:29               ` Junio C Hamano
2021-10-25 21:22                 ` Ævar Arnfjörð Bjarmason
2021-10-25 21:26                   ` Junio C Hamano
2021-10-22 19:36             ` [PATCH v2 02/10] generate-cmdlist.sh: trivial whitespace change Ævar Arnfjörð Bjarmason
2021-10-22 19:36             ` [PATCH v2 03/10] generate-cmdlist.sh: spawn fewer processes Ævar Arnfjörð Bjarmason
2021-10-22 19:36             ` [PATCH v2 04/10] generate-cmdlist.sh: don't call get_categories() from category_list() Ævar Arnfjörð Bjarmason
2021-10-22 19:36             ` [PATCH v2 05/10] generate-cmdlist.sh: run "grep | sort", not "sort | grep" Ævar Arnfjörð Bjarmason
2021-10-22 19:36             ` [PATCH v2 06/10] generate-cmdlist.sh: replace for loop by printf's auto-repeat feature Ævar Arnfjörð Bjarmason
2021-10-22 19:36             ` [PATCH v2 07/10] generate-cmdlist.sh: stop sorting category lines Ævar Arnfjörð Bjarmason
2021-10-25 16:39               ` Jeff King
2021-10-22 19:36             ` [PATCH v2 08/10] generate-cmdlist.sh: do not shell out to "sed" Ævar Arnfjörð Bjarmason
2021-10-25 16:46               ` Jeff King
2021-10-25 17:52                 ` Jeff King
2021-10-22 19:36             ` [PATCH v2 09/10] generate-cmdlist.sh: replace "grep' invocation with a shell version Ævar Arnfjörð Bjarmason
2021-10-23 22:19               ` Junio C Hamano
2021-10-23 22:26               ` Junio C Hamano
2021-10-22 19:36             ` [PATCH v2 10/10] generate-cmdlist.sh: replace "cut", "tr" and "grep" with pure-shell Ævar Arnfjörð Bjarmason
2021-10-23 22:26               ` Junio C Hamano
2021-10-22 21:20             ` [PATCH v2 00/10] Makefile: make generate-cmdlist.sh much faster Taylor Blau
2021-10-23 22:34             ` Junio C Hamano
2021-10-25 16:57             ` Jeff King
2021-11-05 14:07             ` [PATCH v3 00/10] generate-cmdlist.sh: make it (and "make") run faster Ævar Arnfjörð Bjarmason
2021-11-05 14:07               ` [PATCH v3 01/10] command-list.txt: sort with "LC_ALL=C sort" Ævar Arnfjörð Bjarmason
2021-11-05 22:45                 ` Junio C Hamano
2021-11-06  4:26                   ` Ævar Arnfjörð Bjarmason
2021-11-08 19:18                     ` Junio C Hamano
2021-11-05 14:08               ` [PATCH v3 02/10] generate-cmdlist.sh: trivial whitespace change Ævar Arnfjörð Bjarmason
2021-11-05 14:08               ` [PATCH v3 03/10] generate-cmdlist.sh: spawn fewer processes Ævar Arnfjörð Bjarmason
2021-11-05 22:47                 ` Junio C Hamano
2021-11-06  4:23                   ` Ævar Arnfjörð Bjarmason
2021-11-05 14:08               ` [PATCH v3 04/10] generate-cmdlist.sh: don't call get_categories() from category_list() Ævar Arnfjörð Bjarmason
2021-11-05 14:08               ` [PATCH v3 05/10] generate-cmdlist.sh: run "grep | sort", not "sort | grep" Ævar Arnfjörð Bjarmason
2021-11-05 14:08               ` [PATCH v3 06/10] generate-cmdlist.sh: replace for loop by printf's auto-repeat feature Ævar Arnfjörð Bjarmason
2021-11-05 14:08               ` [PATCH v3 07/10] generate-cmdlist.sh: stop sorting category lines Ævar Arnfjörð Bjarmason
2021-11-05 14:08               ` [PATCH v3 08/10] generate-cmdlist.sh: do not shell out to "sed" Ævar Arnfjörð Bjarmason
2021-11-05 14:08               ` [PATCH v3 09/10] generate-cmdlist.sh: replace "grep' invocation with a shell version Ævar Arnfjörð Bjarmason
2021-11-05 14:08               ` [PATCH v3 10/10] generate-cmdlist.sh: don't parse command-list.txt thrice Ævar Arnfjörð Bjarmason
2021-06-25 21:17   ` Why the Makefile is so eager to re-build & re-link Felipe Contreras
2021-06-29  5:04   ` Eric Sunshine
2021-06-24 23:35 ` Øystein Walle
2021-06-24 23:39   ` Øystein Walle
2021-06-25  0:11   ` Ævar Arnfjörð Bjarmason
2021-07-02 11:58 ` [PATCH] Documentation/Makefile: don't re-build on 'git version' changes Ævar Arnfjörð Bjarmason
2021-07-02 15:53   ` Junio C Hamano
2021-07-03 11:58     ` Ævar Arnfjörð Bjarmason
2021-07-05 19:48       ` Junio C Hamano
2021-07-03  1:05   ` Felipe Contreras
2021-07-03 12:03     ` Ævar Arnfjörð Bjarmason
2021-07-03 18:56       ` Felipe Contreras
2021-07-05 19:38       ` Junio C Hamano
2021-07-06 22:25         ` Felipe Contreras

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