From: Stephane Chazelas <stephane@chazelas.org>
To: Bart Schaefer <schaefer@brasslantern.com>,
Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: Example / partial fix for printf with math expressions
Date: Sun, 25 Feb 2024 06:54:00 +0000 [thread overview]
Message-ID: <20240225065400.wrb3jxr7vub6t42v@chazelas.org> (raw)
In-Reply-To: <20240224144041.7huny3lmihsrokdm@chazelas.org>
2024-02-24 14:40:41 +0000, Stephane Chazelas:
[...]
> With the one below using curlen / len[argp-args]:
[...]
> + zlongval = (curarg) ? mathevali(metafy(curarg, curlen, META_HEAPDUP)) : 0;
[...]
That incur a performance penalty:
$ time zsh -c 'repeat 1000 printf %d 123_456+{1..10000}' > /dev/null
zsh -c 'repeat 1000 printf %d 123_456+{1..10000}' > /dev/null 6.07s user 0.46s system 99% cpu 6.544 total
$ time ./Src/zsh -c 'repeat 1000 printf %d 123_456+{1..10000}' > /dev/null
./Src/zsh -c 'repeat 1000 printf %d 123_456+{1..10000}' > /dev/null 9.97s user 0.62s system 99% cpu 10.602 total
The numbers end up being metafied (earlier), unmetafied by
printf, metafied again by printf here and that metafication
processed by the math handler I guess.
Maybe the performance could be *improved* instead if the
unmetafication could be skipped altogether in printf in those
cases?
--
Stephane
next prev parent reply other threads:[~2024-02-25 6:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-23 23:23 Bart Schaefer
2024-02-24 14:40 ` Stephane Chazelas
2024-02-24 15:10 ` Stephane Chazelas
2024-02-24 21:51 ` Bart Schaefer
2024-02-25 6:54 ` Stephane Chazelas [this message]
2024-02-26 0:04 ` Bart Schaefer
2024-02-26 17:12 ` Bart Schaefer
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