Re: [Bug-ddrescue] ddrescue 10x slow under osx

[Antonio Diaz Diaz]

Hello Garegin, (thanks Florian).

Garegin Asatryan wrote:
> > Try using /dev/rdiskX as source instead of /dev/diskX. Does that speed
> > things up?
>
> yes. it fixed the problem. a patch should be made to warn the user, when
> running under osx. should buffered i/o cause such huge slowdowns, or is the
> problem a bottleneck in the program itself.

Ddrescue's manual already says this:

"Using direct disc access, or reading from a raw device, may be slower 
or faster than normal cached reading depending on your OS and hardware."

I do not find practical to include concrete warnings for every version 
of every OS.

I don't know of any bottleneck in ddrescue itself but, if there is one, 
OS-agnostic patches fixing it are welcome.


Regards,
Antonio.