From: Junio C Hamano <gitster@pobox.com>
To: Taylor Blau <me@ttaylorr.com>
Cc: "Christian Göttsche" <cgzones@googlemail.com>, git@vger.kernel.org
Subject: Re: [PATCH] setup: avoid unconditional open with write flags
Date: Tue, 06 Dec 2022 09:10:51 +0900 [thread overview]
Message-ID: <xmqq7cz5pf1w.fsf@gitster.g> (raw)
In-Reply-To: <Y453yiYAifv/oV5n@nand.local> (Taylor Blau's message of "Mon, 5 Dec 2022 17:59:28 -0500")
Taylor Blau <me@ttaylorr.com> writes:
> So it appears that the old version is ever-so-slightly faster than the
> new one. But it's so noisy, and the regression is so small that it's
> hard to notice it at all.
>
> So I wouldn't strongly oppose the patch based on those numbers, but in
> principle it seems flawed.
Thanks for writing and reviewing.
As long as we were touching the function, I suspect that
the logic should become more like
if (fd #0 is not open)
open /dev/null read-only and give it to fd #0
if (fd #1 is not open)
open /dev/null write-only and give it to fd #1
if (fd #2 is not open)
open /dev/null write-only and give it to fd #2
with opening of /dev/null optimized not to happen when not needed.
next prev parent reply other threads:[~2022-12-06 0:10 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-05 19:00 [PATCH] setup: avoid unconditional open with write flags Christian Göttsche
2022-12-05 22:13 ` brian m. carlson
2022-12-06 1:38 ` Jeff King
2022-12-06 16:15 ` Christian Göttsche
2022-12-05 22:59 ` Taylor Blau
2022-12-06 0:10 ` Junio C Hamano [this message]
2022-12-06 0:31 ` Taylor Blau
2022-12-06 0:40 ` Junio C Hamano
2022-12-06 19:47 ` René Scharfe
2022-12-06 23:39 ` Junio C Hamano
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=xmqq7cz5pf1w.fsf@gitster.g \
--to=gitster@pobox.com \
--cc=cgzones@googlemail.com \
--cc=git@vger.kernel.org \
--cc=me@ttaylorr.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.