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Re: dvd+rw-tools update [6.0, DVD-R DL]

Bill Davidsen <davidsen@tmr.com> wrote:

> >But now I see where you like to use O_DIRECT.
> >
> >If you use O_DIRECT for writing, it makes sense and in the same case
> >it makes sense to use directio(fd, DIRECTIO_ON); on Solaris.
> >  
> >
> By not buffering the output of mkisofs, for example, buffer space is 
> available for reading. This makes a small improvement on a large memory, 
> much more as the memory is smaller and read ahead could be impacted by 
> buffering writes.
> >Although on Solaris, it only saves System CPU time and I cannot see
> >an wall clock improvement.
> >  
> >
> I haven't tested there, and I bet you have not tested in small memory (I 
> use 160MB for test).
> >Whether this makes sense with the _output_ file from star or mkisofs
> >needs to be tested.....
> >
> I had not tried with the output of star, that's an interesting suggestion.

I did try it recently with creating a SchilliX ISO image (~ 20000 files
700 MB) and it did not help.


 EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
       js@cs.tu-berlin.de                (uni)  
       schilling@fokus.fraunhofer.de     (work) Blog: http://schily.blogspot.com/
 URL:  http://cdrecord.berlios.de/old/private/ ftp://ftp.berlios.de/pub/schily

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