Rsync: Re: patch to enable faster mirroring of large filesyst ems

Alberto Accomazzi aaccomazzi at
Fri Nov 30 06:30:16 EST 2001

It seems to me the new options --read-batch and --write-batch should go 
a long way towards reducing any time spent in creation of checksums and
file lists, so you should definitely give 2.4.7pre4 a try.  This is just
a guess since I haven't actually used those options myself, but seems
worth looking into.

BTW, could we please have some real documentation about these options?  What's
in the man page doesn't come nearly close to telling what is cached and
how to make use of it.  Some examples of how people are using this option
may be illuminating for those of us who don't have the time or inclination 
to figure it out from the code.

-- Alberto

In message <2292DBED5A978A498EABCCE95524499E0281D89C at>,
 "Keating, Tim" writes:

> I was at first, but then removed it. The results were still insufficiently
> fast.
> > Were you using the -c option of rsync?  It sounds like you 
> > were and it's
> > extremely slow.  I knew somebody who once went to 
> > extraordinary lengths to
> > avoid the overhead of -c, making a big patch to rsync to 
> > cache checksums,
> > when all he had to do was not use -c.

Alberto Accomazzi                          mailto:aaccomazzi at
NASA Astrophysics Data System            
Harvard-Smithsonian Center for Astrophysics
60 Garden Street, MS 83, Cambridge, MA 02138 USA   

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