Mercurial > hg
view contrib/undumprevlog @ 46775:c94fa884240b
rust: Preallocate the returned `Vec` in `utils::files::relativize_path`
Profiling `rhg files > /dev/null` on an old snapshot of mozilla-central
(with `perf` and the Firefox Profiler:
https://github.com/firefox-devtools/profiler/blob/main/docs-user/guide-perf-profiling.md)
showed non-trivial time spend in this function and in `realloc`.
This change makes the wall-clock time for that process on my machine
go from ~190 ms to ~150 ms.
Differential Revision: https://phab.mercurial-scm.org/D10199
author | Simon Sapin <simon.sapin@octobus.net> |
---|---|
date | Sat, 13 Mar 2021 08:59:03 +0100 |
parents | 59fa3890d40a |
children | 4c041c71ec01 |
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#!/usr/bin/env python3 # Undump a dump from dumprevlog # $ hg init # $ undumprevlog < repo.dump from __future__ import absolute_import, print_function import sys from mercurial.node import bin from mercurial import ( encoding, revlog, transaction, vfs as vfsmod, ) from mercurial.utils import procutil for fp in (sys.stdin, sys.stdout, sys.stderr): procutil.setbinary(fp) opener = vfsmod.vfs(b'.', False) tr = transaction.transaction( sys.stderr.write, opener, {b'store': opener}, b"undump.journal" ) while True: l = sys.stdin.readline() if not l: break if l.startswith("file:"): f = encoding.strtolocal(l[6:-1]) r = revlog.revlog(opener, f) procutil.stdout.write(b'%s\n' % f) elif l.startswith("node:"): n = bin(l[6:-1]) elif l.startswith("linkrev:"): lr = int(l[9:-1]) elif l.startswith("parents:"): p = l[9:-1].split() p1 = bin(p[0]) p2 = bin(p[1]) elif l.startswith("length:"): length = int(l[8:-1]) sys.stdin.readline() # start marker d = encoding.strtolocal(sys.stdin.read(length)) sys.stdin.readline() # end marker r.addrevision(d, tr, lr, p1, p2) tr.close()