Re: Performance difference between different versions of bash

[alex xmb ratchev]

On Thu, Jun 8, 2023, 14:16 wang yuhang via Bug reports for the GNU Bourne
Again SHell <bug-bash@gnu.org> wrote:

> Hi


hi , i made some optional benchmark code
it .. doesnt make much sense cause i too lately read / understood about the
time echo `date` part

i originally when i tried there were weird bugs
also one where a probably specific alias ( the C one ) if it was C=$' it
errored , cmd not found , as the cmd in eval in c()
then when C=' it worked
.. now that bug also disappeared ( both works .. just in printf the current
code is for ' , in $' in \\n \n instead \\n ..

.. nm ..

the code s about benchmarking
eg not wanting exec seq or date

on aarch64 termux android foun , bash 5.2.15
i cant paste anything in this crapmail ( app )


I found that there is a huge difference in performance between different
> versions of bash when there are a large number of environment variables in
> my system.
>
>
> The steps to reproduce are as follows：
> $ for i in `seq 10000`; do export TEST_ENV_$i=$i; done
> $ time echo `date`
>
>
> In bash-4.3, it only takes 0.002 seconds, but in bash-5.2, it takes up to
> 0.5 seconds.
>
>
> I want to know if this is due to certain features in the higher version of
> bash or due to some hidden bugs.&nbsp;
>
> I hope to get your help.

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