Re: ZSH performance regression in 5.8.1.2-test

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

On Mon, Apr 25, 2022 at 11:26 AM Jordan Patterson <jordanp@xxxxxxxxx> wrote:
>
>   'prefix/5.8.1/bin/zsh -i -c exit' ran
>     9.22 ± 0.27 times faster than 'prefix/5.8.1.2-test/bin/zsh -i -c exit'

I'm curious how large is your interactive startup?  I just compared
5.8.1.2-test with and without the line-buffering patch running
  zsh -xfic 'autoload compinit; compinit -D' 2>>(wc)
and in order to get any significant difference I need to have compiled
with --enable-zsh-debug --enable-zsh-mem-debug.

wc gives 55727 lines / 1858616 characters of xtrace output, which
ought to be enough for a reasonable comparison?

Without debugging:
line buffered:  0.57s user 0.31s system 100% cpu 0.883 total
block read:  0.56s user 0.30s system 100% cpu 0.862 total

With debugging:
line buffered:  1.21s user 1.44s system 72% cpu 3.669 total
block read:  0.80s user 0.93s system 100% cpu 1.720 total