Re: [rdiff-backup-users] rdiff-backup performance

[Jakob Unterwurzacher]

Hi!

Daniel.Li schrieb:
> Dear List,
> 
> I'm new to rdiff-backup here.
> 
> I have read http://www.nongnu.org/rdiff-backup/FAQ.html#speed, And found
> that the speed is really slow.
> 
> 500MB (differs) / 15 min = 0.56MB/s

You ignored that rdiff-backup has to read a lot more than 500MB to get
the 500MB diffs (files' timestamps and file data that has not changed).

> 
> Athlon 2000, 7200 IDE disks, version 0.12.2 (really old version, but It
> doesn't updated, is there any improvement?)
> 
> Any comment on this? 

It really depends upon how many files you have. For a server (lots of
files in maildirs etc., won't fit in the dir cache), rdiff-backup is
disk-bound - reading all the files' timestamp just takes lots of time
that cannot be optimized.