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Wed, 27 Apr 2022 08:03:01 -0700 (PDT) MIME-Version: 1.0 References: <20220425192036.p6awbyro2a2lp7bq@chazelas.org> <1592299421.100566.1650961915601@mail2.virginmedia.com> <20220427141117.6cn4ca72kexv622s@chazelas.org> In-Reply-To: <20220427141117.6cn4ca72kexv622s@chazelas.org> From: Bart Schaefer Date: Wed, 27 Apr 2022 08:02:49 -0700 Message-ID: Subject: Re: ZSH performance regression in 5.8.1.2-test To: Peter Stephenson , Zsh hackers list Content-Type: text/plain; charset="UTF-8" X-Seq: 50118 Archived-At: X-Loop: zsh-workers@zsh.org Errors-To: zsh-workers-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-workers-request@zsh.org X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: On Wed, Apr 27, 2022 at 7:12 AM Stephane Chazelas 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.