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Re: Optimisation request
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From: |
Chet Ramey |
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Subject: |
Re: Optimisation request |
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Date: |
Thu, 29 Nov 2018 09:02:28 -0800 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 |
On 11/26/18 1:29 PM, Martijn Dekker wrote:
> I've noticed bash-5.0beta is quite a bit faster than bash-4.4 in running a
> lot of pure shell code. Good news.
>
> One optimisation that isn't done yet: if a subshell function like
>
> f() (foo)
>
> is used in a command substitution, it forks twice. I would like it if it
> could be optimised to eliminate the fork if the subshell function is the
> last command in the command substitution.
There is already code to optimize subshell commands like this; it's just
disabled until bash-5.1 so I have more time to test it.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/