https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199140
Bug ID: 199140
Summary: unlinking symlinks oddly slow on UFS
Product: Base System
Version: 9.3-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
On a UFS2 filesystem with soft updates, deleting a directory of thousands of
symlinks is hundreds of times slower than deleting regular files.
It looks like the writes are synchronous.
$ mkdir test1 && for f in `seq 5000`; do touch "test1/$f"; done
$ mkdir test2 && for f in `seq 5000`; do echo test > "test2/$f"; done
$ mkdir test3 && for f in `seq 5000`; do ln -s test "test3/$f"; done
$ sync
$ time rm -r test1
0.20 real 0.01 user 0.17 sys
$ time rm -r test2
0.30 real 0.00 user 0.25 sys
$ time rm -r test3
94.73 real 0.02 user 0.72 sys
But if the symlinks are made large enough that their targets cannot be stored
in the inode directly, then unlinking them is fast!
$ test="$(perl -e 'print "x"x1023')"
$ mkdir test4 && for f in `seq 5000`; do ln -s "$test" "test4/$f"; done
$ time rm -r test4
0.17 real 0.00 user 0.17 sys
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