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Re: performance bug of [[ $x ]]


From: Peng Yu
Subject: Re: performance bug of [[ $x ]]
Date: Sat, 7 Mar 2020 22:31:19 -0600

My OS is Mac OS X. I don't have perf. Is it only on linux? Could you
show me the output of your perf?

On 3/7/20, Chris Down <address@hidden> wrote:
> Peng Yu writes:
>>Could you show me how you do the profiling for this specific case?
>>Based on what proof that you can conclude that it is not the `[[`
>>performance problem?
>
> Like I said, `perf` is perfectly adequate.
>
>      bash -c 'x=$(printf "%.sx" {1..10000000}); perf record -g -p $$ & sleep
> 2; time [[ $x ]]'
>
> You might as well just use `:`.
>


-- 
Regards,
Peng



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