Messages in this thread |  | | Subject | Re: File System Performance | From | Xavier Bestel <> | Date | 12 Nov 2001 23:39:52 +0100 |
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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.
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