unison slow on slightly modified large files
Bug #394895 reported by
J. Bruce Fields
This bug affects 3 people
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
unison (Ubuntu) |
Fix Released
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Undecided
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Unassigned |
Bug Description
Binary package hint: unison-gtk
I use unison daily to synchronize a home directory between 3 different machines. The home directory includes a number of large mailbox files which are mostly just appended to. Recently transfers of those files have started taking much longer than they used to, even when the only difference between two versions is a few new messages appended to one of them.
My suspicion is that unison has for some reason started doing whole-file copies of those files instead of using the rsync algorithm, but I haven't confirmed this.
All three machines are running jaunty, with unison at 2.27.57-1ubuntu1.
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Found a fix upstream; applied the fix on both sides and confirmed that performance returns to normal.
The problem should be reproduceable any time one machine is 32-bit and the other 64.