match: convert O(n) to O(log n) in exactmatcher.visitchildrenset
When using narrow, during rebase this is called (at least) once per directory in
the set of files in the commit being rebased. Every time it's called, we did the
set arithmetic (now extracted and cached), which was probably pretty cheap but
not necessary to repeat each time, looped over every item in the matcher and
kept things that started with the directory we were querying.
With very large narrowspecs, and a commit that touched a file in a large number
of directories, this was slow. In a pathological repo, the rebase of a single
commit (that touched over 17k files, I believe in approximately as many
directories) with a narrowspec that had >32k entries took 8,246s of profiled
time, with 5,007s of that spent in visitchildrenset (transitively). With this
change, the time spent in visitchildrenset is less than 34s (which is where my
profile cut off). Most of the remaining time was network access due to our
custom remotefilelog-based setup not properly prefetching.
Differential Revision: https://phab.mercurial-scm.org/D10294
$ . $TESTDIR/wireprotohelpers.sh
$ hg init server
$ enablehttpv2 server
$ cd server
$ cat >> .hg/hgrc << EOF
> [web]
> push_ssl = false
> allow-push = *
> EOF
$ hg debugdrawdag << EOF
> C D
> |/
> B
> |
> A
> EOF
$ hg serve -p $HGPORT -d --pid-file hg.pid -E error.log
$ cat hg.pid > $DAEMON_PIDS
pushkey for a bookmark works
$ sendhttpv2peer << EOF
> command pushkey
> namespace bookmarks
> key @
> old
> new 426bada5c67598ca65036d57d9e4b64b0c1ce7a0
> EOF
creating http peer for wire protocol version 2
sending pushkey command
response: True
$ sendhttpv2peer << EOF
> command listkeys
> namespace bookmarks
> EOF
creating http peer for wire protocol version 2
sending listkeys command
response: {
b'@': b'426bada5c67598ca65036d57d9e4b64b0c1ce7a0'
}
$ cat error.log