From: Sebastian Gniazdowski <psprint@zdharma.org>
To: Stephane Chazelas <stephane.chazelas@gmail.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: Performance tests of quoting and dequoting, printf -v turned out slow
Date: Sat, 10 Mar 2018 09:36:42 +0100 [thread overview]
Message-ID: <etPan.5aa3991a.596633ab.159ee@zdharma.org> (raw)
In-Reply-To: <20180309145352.GB20986@chaz.gmail.com>
On 9 marca 2018 at 15:53:52, Stephane Chazelas (stephane.chazelas@gmail.com) wrote:
> 2018-03-09 14:39:10 +0100, Sebastian Gniazdowski:
> [...]
> > 5.3.1, I looked also at 5.4.2 and the results were the same.
> > For your snippets I get the same results as you. If I source
> > short.zsh, I again get ~25 sec time. I will find some time to
> > narrow this shortly.
> [...]
>
> Maybe a heavy (that forks for instance) "DEBUG" trap?
>
> or a wrapper function around "printf"?
I only changed method of time measurement in your snippet, and obtained the slowness:
% typeset -F3 SECONDS=0; INPUT='ice as"program" pick"$ZPFX/bin/prll_(qer|bfr)" src"prll.sh" make"install PREFIX=$ZPFX"'; for ((i = 0; i < 50000; i++)); do printf -v OUTPUT '%q' "$INPUT"; done; echo $SECONDS
151.137
Not sure what using `time' instead of $SECONDS does, but above method is less suspected of any side effects.
--
Sebastian Gniazdowski
psprint /at/ zdharma.org
next prev parent reply other threads:[~2018-03-10 8:37 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-09 6:22 Sebastian Gniazdowski
2018-03-09 13:23 ` Stephane Chazelas
[not found] ` <etPan.5aa28b1e.77e79f33.159ee@AirmailxGenerated.am>
2018-03-09 13:39 ` Sebastian Gniazdowski
2018-03-09 14:53 ` Stephane Chazelas
2018-03-10 8:36 ` Sebastian Gniazdowski [this message]
2018-03-10 15:03 ` Stephane Chazelas
[not found] ` <etPan.5aa3f656.1efba338.159ee@AirmailxGenerated.am>
2018-03-10 16:53 ` Sebastian Gniazdowski
2018-03-10 15:40 ` Oliver Kiddle
2018-03-11 8:33 ` Bart Schaefer
2018-03-13 11:28 ` Sebastian Gniazdowski
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