There are always exceptions like with clustered filesystem etc etc. That 
is why I wrote 'most used'. If you take all the issued 'cp' commands of 
today in the world. I would bet 80%-95% of them would not benefit from 
some sort of parallel processing.


-----Original Message-----
From: L A Walsh [mailto:coreut...@tlinx.org] 
Sent: vrijdag 28 juni 2019 13:15
To: Marc Roos
Cc: aglo; coreutils
Subject: Re: question about parallelism in cp command

On 2019/06/06 09:25, Marc Roos wrote:
>  
> Hmmm without being a maintainer. I would say cp -r is most used on 
> single disk, so one thread is using the maximum disk iops taking y 
> time to copy.
---
    not exactly true, if the 1 disk as a 20 disk raid10.

You can target 10 areas at a time and get considerable benefit if they 
are spread across multiple disks in the raid.




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