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From: Jeff King <peff@peff.net>
To: Junio C Hamano <gitster@pobox.com>
Cc: Elijah Newren via GitGitGadget <gitgitgadget@gmail.com>,
	Git Mailing List <git@vger.kernel.org>,
	Phillip Wood <phillip.wood123@gmail.com>,
	Taylor Blau <me@ttaylorr.com>, Elijah Newren <newren@gmail.com>
Subject: Re: [PATCH v2 1/3] test-lib: allow selecting tests by substring/regex with --run
Date: Wed, 14 Oct 2020 14:07:07 -0400
Message-ID: <20201014180707.GB24279@coredump.intra.peff.net> (raw)
In-Reply-To: <CAPc5daVa4j5mDvTzCFCX2bLr1qVFLO=P=nSakT+mDG1kqeXa+g@mail.gmail.com>

On Wed, Oct 14, 2020 at 10:46:15AM -0700, Junio C Hamano wrote:

> > I like that you allow regexes. It's unfortunate that the skip-check
> > costs us a process in every test. It may not be that big a deal since we
> > only pay it if you use a non-numeric selector. But I wonder if there's
> > any reason not to use "expr" here, as well.
> 
> If you define the pattern is not regexp but is glob, you can use
> case/esac to do this without any forking.

Yes, that would probably be OK for most purposes, though I admit my real
love for regex support is the ability to use "." instead of space to
avoid quoting arguments. ;)

Globs may make some real patterns slightly simpler, though. I imagine
that the "setup" example may need to be "set.?up" or "set.*up" in
practice. Which is only "set*up" as a glob (I also don't have a problem
standardizing on one spelling as people find cases).

> Your expr may well be built-in, though.

Yeah, that was my assumption, though I didn't bother to test it. Having
done so, it looks like it's not a built-in either in dash or bash.  So
switching to it from grep may be buying less in practice than I thought.

We're also running a ton of exprs earlier in the function. Running:

  strace -f -e execve -o foo.out ./t0003-attributes.sh --run=10

appears to exec expr 65 times. There are only 103 execves total in the
whole run, so that's more than half of them! It might be worth seeing if
some of those could do globbing via case/esac.

Repeating without "--run" yields 39 exprs out of 492 execs. So that's
less abysmal. Most of those are from test_oid_cache.

-Peff

  reply index

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-12 23:26 [PATCH 0/3] Make test selection easier by specifying description substrings instead of just numeric counters Elijah Newren via GitGitGadget
2020-10-12 23:26 ` [PATCH 1/3] test-lib: allow selecting tests by substring/regex with --run Elijah Newren via GitGitGadget
2020-10-13 15:39   ` Taylor Blau
2020-10-13 17:23     ` Elijah Newren
2020-10-13 17:28       ` Taylor Blau
2020-10-13 18:21         ` Elijah Newren
2020-10-12 23:26 ` [PATCH 2/3] t6006, t6012: adjust tests to use 'setup' instead of synonyms Elijah Newren via GitGitGadget
2020-10-12 23:26 ` [PATCH 3/3] test-lib: reduce verbosity of skipped tests Elijah Newren via GitGitGadget
2020-10-13 15:44   ` Taylor Blau
2020-10-13 17:56     ` Elijah Newren
2020-10-13 19:27       ` Junio C Hamano
2020-10-13 13:08 ` [PATCH 0/3] Make test selection easier by specifying description substrings instead of just numeric counters Phillip Wood
2020-10-15 11:48   ` Johannes Schindelin
2020-10-15 13:42     ` Phillip Wood
2020-10-13 19:19 ` [PATCH v2 " Elijah Newren via GitGitGadget
2020-10-13 19:19   ` [PATCH v2 1/3] test-lib: allow selecting tests by substring/regex with --run Elijah Newren via GitGitGadget
2020-10-14 17:04     ` Jeff King
2020-10-14 17:46       ` Junio C Hamano
2020-10-14 18:07         ` Jeff King [this message]
2020-10-14 19:24           ` Junio C Hamano
2020-10-14 19:41             ` Elijah Newren
2020-10-14 19:49               ` Jeff King
2020-10-15 16:09                 ` Junio C Hamano
2020-10-15 15:59               ` Junio C Hamano
2020-10-14 17:50       ` Elijah Newren
2020-10-14 17:57         ` Junio C Hamano
2020-10-14 19:12           ` Elijah Newren
2020-10-15 16:10             ` Junio C Hamano
2020-10-14 18:09         ` Jeff King
2020-10-14 19:02           ` Elijah Newren
2020-10-15 16:20       ` Junio C Hamano
2020-10-15 19:46         ` Jeff King
2020-10-15 20:08           ` Junio C Hamano
2020-10-16  0:38             ` Jeff King
2020-10-16 16:16               ` Junio C Hamano
2020-10-16 16:30                 ` Junio C Hamano
2020-10-16 20:06                 ` Jeff King
2020-10-16 20:22                   ` Junio C Hamano
2020-10-13 19:19   ` [PATCH v2 2/3] t6006, t6012: adjust tests to use 'setup' instead of synonyms Elijah Newren via GitGitGadget
2020-10-13 19:19   ` [PATCH v2 3/3] test-lib: reduce verbosity of skipped tests Elijah Newren via GitGitGadget
2020-10-14 16:53     ` Jeff King
2020-10-14 17:39       ` Elijah Newren
2020-10-14 17:55         ` Jeff King
2020-10-14 17:57           ` Elijah Newren
2020-10-13 19:49   ` [PATCH v2 0/3] Make test selection easier by specifying description substrings instead of just numeric counters Taylor Blau
2020-10-14 21:13   ` [PATCH v3 " Elijah Newren via GitGitGadget
2020-10-14 21:13     ` [PATCH v3 1/3] test-lib: allow selecting tests by substring/glob with --run Elijah Newren via GitGitGadget
2020-10-16 11:40       ` Phillip Wood
2020-10-16 17:27         ` Elijah Newren
2020-10-16 18:24           ` Phillip Wood
2020-10-16 20:02           ` Junio C Hamano
2020-10-16 20:07             ` Jeff King
2020-10-14 21:13     ` [PATCH v3 2/3] t6006, t6012: adjust tests to use 'setup' instead of synonyms Elijah Newren via GitGitGadget
2020-10-14 21:13     ` [PATCH v3 3/3] test-lib: reduce verbosity of skipped tests Elijah Newren via GitGitGadget
2020-10-15 19:48     ` [PATCH v3 0/3] Make test selection easier by specifying description substrings instead of just numeric counters Jeff King
2020-10-16 19:28     ` [PATCH v4 " Elijah Newren via GitGitGadget
2020-10-16 19:28       ` [PATCH v4 1/3] test-lib: allow selecting tests by substring/glob with --run Elijah Newren via GitGitGadget
2020-10-16 19:28       ` [PATCH v4 2/3] t6006, t6012: adjust tests to use 'setup' instead of synonyms Elijah Newren via GitGitGadget
2020-10-16 19:28       ` [PATCH v4 3/3] test-lib: reduce verbosity of skipped tests Elijah Newren via GitGitGadget
2020-10-16 20:25       ` [PATCH v4 0/3] Make test selection easier by specifying description substrings instead of just numeric counters Junio C Hamano
2020-10-16 20:56         ` Elijah Newren
2020-10-16 22:50       ` [PATCH v5 " Elijah Newren via GitGitGadget
2020-10-16 22:50         ` [PATCH v5 1/3] test-lib: allow selecting tests by substring/glob with --run Elijah Newren via GitGitGadget
2020-10-16 23:25           ` Andrei Rybak
2020-10-17 23:43             ` Elijah Newren
2020-10-16 22:50         ` [PATCH v5 2/3] t6006, t6012: adjust tests to use 'setup' instead of synonyms Elijah Newren via GitGitGadget
2020-10-16 22:50         ` [PATCH v5 3/3] test-lib: reduce verbosity of skipped tests Elijah Newren via GitGitGadget
2020-10-18  0:23         ` [PATCH v6 0/3] Make test selection easier by specifying description substrings instead of just numeric counters Elijah Newren via GitGitGadget
2020-10-18  0:23           ` [PATCH v6 1/3] test-lib: allow selecting tests by substring/glob with --run Elijah Newren via GitGitGadget
2020-10-18  0:23           ` [PATCH v6 2/3] t6006, t6012: adjust tests to use 'setup' instead of synonyms Elijah Newren via GitGitGadget
2020-10-18  0:23           ` [PATCH v6 3/3] test-lib: reduce verbosity of skipped tests Elijah Newren via GitGitGadget

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