Re: [rdiff-backup-users] How to speed up rdiff-backup

[dean gaudet]

On Fri, 14 Oct 2005, Carsten Lorenz wrote:

> Has anyone hints how to speedup rdiff-backup?

i just had a random idea while reading one of the other threads...

maybe fsync is the culprit for the slow initial backups (compared to 
rsync) ... it would also slow down increments, but assuming a typical rate 
of file change that wouldn't be as noticable.

what would probably be telling is to get some "strace -r -T" output during 
an initial backup and see just where it's spending its time.  i tend to 
take such output and run it through sort -t\< -k 2,2 ... which would sort 
on the <n.nnnn> syscall timings... look for the worst culprits then work 
backwards to figure out wtf rdiff-backup was trying to do when it hit 
those worst cases... but if you send me some output i can do the data 
mining.

-dean