From: Junio C Hamano <gitster@pobox.com>
To: Jeff King <peff@peff.net>
Cc: Michael Haggerty <mhagger@alum.mit.edu>,
William Duclot <william.duclot@ensimag.grenoble-inp.fr>,
git@vger.kernel.org, antoine.queru@ensimag.grenoble-inp.fr,
francois.beutin@ensimag.grenoble-inp.fr,
Johannes.Schindelin@gmx.de, mh@glandium.org
Subject: Re: [PATCH V2 3/3] strbuf: allow to use preallocated memory
Date: Wed, 08 Jun 2016 12:48:36 -0700 [thread overview]
Message-ID: <xmqq37onlawb.fsf@gitster.mtv.corp.google.com> (raw)
In-Reply-To: <20160608191918.GB19572@sigill.intra.peff.net> (Jeff King's message of "Wed, 8 Jun 2016 15:19:18 -0400")
Jeff King <peff@peff.net> writes:
> That made me wonder if we could repeatedly reuse a buffer attached to
> the file descriptor. And indeed, isn't that what stdio is? The whole
> reason this buffer exists is because we are using a direct descriptor
> write. If we switched this function to use fprintf(), we'd avoid the
> whole buffer question, have a fixed cap on our memory use (since we just
> flush anytime the buffer is full) _and_ we'd reduce the number of
> write syscalls we're making by almost a factor of 100.
The primary reason why we avoid stdio in the lower level part of I/O
is that the error reporting and handling is horrible.
e.g. c.f. http://article.gmane.org/gmane.comp.version-control.git/27019
Otherwise, I'd agree with your "Why aren't we using stdio if
counting and avoiding overflow is so hard?".
next prev parent reply other threads:[~2016-06-08 19:49 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-06 15:13 [PATCH V2 0/3] strbuf: improve API William Duclot
2016-06-06 15:13 ` [PATCH V2 1/3] strbuf: add tests William Duclot
2016-06-06 16:11 ` Matthieu Moy
2016-06-07 8:44 ` Johannes Schindelin
2016-06-06 15:13 ` [PATCH V2 2/3] pretty.c: rename strbuf_wrap() function William Duclot
2016-06-06 16:12 ` Matthieu Moy
2016-06-07 9:04 ` Johannes Schindelin
2016-06-06 15:13 ` [PATCH V2 3/3] strbuf: allow to use preallocated memory William Duclot
2016-06-06 16:17 ` Matthieu Moy
2016-06-06 17:19 ` Junio C Hamano
2016-06-06 20:39 ` William Duclot
2016-06-06 22:44 ` Junio C Hamano
2016-06-06 22:58 ` Jeff King
2016-06-06 23:24 ` Junio C Hamano
2016-06-06 23:25 ` Junio C Hamano
2016-06-06 23:30 ` Jeff King
2016-06-07 9:06 ` William Duclot
2016-06-07 18:10 ` Junio C Hamano
2016-06-08 16:20 ` Michael Haggerty
2016-06-08 18:07 ` Junio C Hamano
2016-06-08 19:19 ` Jeff King
2016-06-08 19:42 ` [PATCH] send-pack: use buffered I/O to talk to pack-objects Jeff King
2016-06-09 12:10 ` Matthieu Moy
2016-06-09 14:34 ` Ramsay Jones
2016-06-09 17:12 ` Jeff King
2016-06-09 22:40 ` Ramsay Jones
2016-06-09 16:40 ` Junio C Hamano
2016-06-09 17:14 ` Jeff King
2016-06-09 17:22 ` Matthieu Moy
2016-06-08 19:48 ` Junio C Hamano [this message]
2016-06-08 19:52 ` [PATCH V2 3/3] strbuf: allow to use preallocated memory Jeff King
2016-06-08 23:05 ` Junio C Hamano
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