From: Peter Stephenson <p.w.stephenson@ntlworld.com>
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: ZSH performance regression in 5.8.1.2-test
Date: Wed, 27 Apr 2022 16:07:45 +0100 (BST) [thread overview]
Message-ID: <732728967.75854.1651072065633@mail2.virginmedia.com> (raw)
In-Reply-To: <CAH+w=7Z7bTOh4E0EX--7LaFyrew3wirLu9Oe_MRTgewWQVtDqg@mail.gmail.com>
> On 27 April 2022 at 16:02 Bart Schaefer <schaefer@brasslantern.com> wrote:
> On Wed, Apr 27, 2022 at 7:12 AM Stephane Chazelas <stephane@chazelas.org> wrote:
> >
> > 2022-04-26 09:31:55 +0100, Peter Stephenson:
> > [...]
> > > Not sure how much difference it makes but to avoid additional system calls
> > > we could cache the result, invalidating it when we open a new file.
> >
> > FYI, see https://github.com/att/ast/issues/15 for the kind of
> > issue you can find with ksh93 caching read data.
>
> I think the idea was to cache the result of the "can we lseek" test,
> not the data that was read.
Yes, I wouldn't expect that to change until we reopen the channel,
which is detectable locally within input.c as we need to set up
the pointers at the same time.
pws
next prev parent reply other threads:[~2022-04-27 15:08 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-25 18:16 Jordan Patterson
2022-04-25 18:56 ` Bart Schaefer
2022-04-25 19:20 ` Stephane Chazelas
2022-04-25 21:27 ` Bart Schaefer
2022-04-26 7:01 ` Bart Schaefer
2022-04-26 8:31 ` Peter Stephenson
2022-04-27 0:33 ` Bart Schaefer
2022-04-27 14:11 ` Stephane Chazelas
2022-04-27 15:02 ` Bart Schaefer
2022-04-27 15:07 ` Peter Stephenson [this message]
2022-04-27 15:17 ` Bart Schaefer
2022-04-26 14:31 ` Jun. T
2022-04-26 15:15 ` Peter Stephenson
2022-04-27 0:55 ` Bart Schaefer
2022-04-27 9:16 ` Jun T
2022-04-27 0:38 ` Bart Schaefer
2022-04-27 9:34 ` Peter Stephenson
2022-04-27 10:28 ` Jun T
2022-04-27 12:42 ` Jun T
2022-04-27 13:58 ` Jun T
2022-04-27 15:25 ` Bart Schaefer
2022-04-27 16:18 ` Jun. T
2022-04-27 19:54 ` Jordan Patterson
2022-04-28 9:53 ` Jun T
2022-04-28 14:56 ` Bart Schaefer
2022-04-28 18:51 ` Jun. T
2022-04-29 0:28 ` Bart Schaefer
2022-04-29 2:25 ` Jun. T
2022-04-26 1:08 ` Bart Schaefer
2022-04-26 3:03 ` Jordan Patterson
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