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Re: Should [[ -v 1 ]] be supported?
From: |
Chet Ramey |
Subject: |
Re: Should [[ -v 1 ]] be supported? |
Date: |
Fri, 28 Dec 2018 18:23:57 -0600 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.3.3 |
On 12/27/18 11:32 PM, Peng Yu wrote:
>> You're whacking moles. Use a profiler. That's what they're for.
>
> I've already shown that $() is a major problem to slow down the speed
> and I have reduced using its usage in my code and significantly
> improved the performance.
This isn't a major deductive leap, since command substitution forks a
child and reads through a pipe. Forking is always more expensive than
not.
--
``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/
- Re: Should [[ -v 1 ]] be supported?, (continued)
- Re: Should [[ -v 1 ]] be supported?, G. Branden Robinson, 2018/12/27
- Re: Should [[ -v 1 ]] be supported?, Peng Yu, 2018/12/27
- Re: Should [[ -v 1 ]] be supported?, G. Branden Robinson, 2018/12/27
- Re: Should [[ -v 1 ]] be supported?, Peng Yu, 2018/12/28
- Re: Should [[ -v 1 ]] be supported?, Eduardo Bustamante, 2018/12/28
- Re: Should [[ -v 1 ]] be supported?, Peng Yu, 2018/12/28
- Re: Should [[ -v 1 ]] be supported?,
Chet Ramey <=
- Re: Should [[ -v 1 ]] be supported?, Greg Wooledge, 2018/12/28
- Re: Should [[ -v 1 ]] be supported?, Chet Ramey, 2018/12/28