https://bugzilla.samba.org/show_bug.cgi?id=12498
Bug ID: 12498
Summary: --fuzzy --fuzzy hugely impacts performance even if
its' not needed
Product: rsync
Version: 3.1.2
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P5
Component: core
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
Hello,
I make backups to a Rsync daemon.
Each backup is made to an empty directory, using 20 --link-dest parameters, so
that already uploaded files are hard-linked.
Perfect.
I made some tests adding --fuzzy --fuzzy so that non-existing files can use a
base-file, when possible.
It works perfectly, really good thing to find a base-file within link-dest
directories.
However, it really slows down the backup process, even when it's not needed.
For example, it terribly impacts performance even for a backup with no new
files at all, for which all files will be hard-linked.
Here are some backup durations for a backup with no new files :
- without -yy : 9 seconds
- with -y : 9 seconds
- with --y and 1 --link-dest : 11 seconds
- with --y and 8 --link-dest : 22 seconds
- with --y and 20 --link-dest : 37 seconds
My question is then, could it be possible for --fuzzy --fuzzy (-yy) to only
work for files which really need to be uploaded ?
So to avoid working for files which will simply be hard-linked.
Would such a modification only impact daemon side ? (would be great)
Thank you very much !
Best regards,
Ben
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