Re: ZSH performance regression in 5.8.1.2-test

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

On Wed, Apr 27, 2022 at 7:12 AM Stephane Chazelas <stephane@xxxxxxxxxxxx> 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.