Re: File System Performance

Xavier Bestel
2001-11-12T22:46:53Z

le lun 12-11-2001 à 23:39, Alan Cox a écrit :
> > Corrections to speed-up the sizeing pass in Amanda:
> > * tar.h: Declare dev_null_output.
> > * buffer.c (open_archive): Detect when archive is /dev/null.
> > (flush_write): Avoid writing to /dev/null.
> > * create.c (dump_file): Do not open file if archive is being
> > written to /dev/null, nor read file nor restore times.
> > Reported by Greg Maples and Tor Lillqvist.
> >
> > One wonders why.
>
> So when you archive the file set twice (once to compute its size) its
> faster. Seems sane enough.

What would have been sane is a tar --just-compute-the-size option, not
hardcoding /dev/null.