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revbranchcache: populate cache incrementally...
revbranchcache: populate cache incrementally Previously the cache would populate completely the first time it was accessed. This could take over a minute on larger repos. This patch changes it to update incrementally. Only values that are read will be written, and it will only rewrite as much of the file as strictly necessary. This adds a magic value of '\0\0\0\0' to represent an empty cache entry. The probability of this matching an actual commit hash prefix is tiny, so it's ok if that's always considered a cache miss. This is also BC safe since any existing entries with '\0\0\0\0' will just be considered misses. Perf numbers: Mozilla-central: hg --time log -r 'branch(mobile)' -T. Cold Cache: 14.7s -> 15.1s (3% worse) Warm Cache: 1.6s -> 2.1s (30% worse) Mozilla-cental: hg perfbranchmap 2s -> 2.4s (20% worse) hg: hg log -r 'branch(stable) & branch(default)' Cold Cache: 3.1s -> 1.9s (40% better - because the old code missed the cache on both branch() revset iterations, so it did twice the work) Warm Cache: 0.2 -> 0.26 (30% worse) internal huge repo: hg --time log -r 'tip & branch(default)' Cold Cache: 65.4s -> 0.2s (327x better) While this change introduces minor regressions when iterating over every commit in a branch, it massively improves the cold cache time for operations which touch a single commit. I feel the better O() is worth it in this case.
Matt Mackall - - Load All Authors

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__init__.py
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/ mercurial / hgweb / __init__.py
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Eric Hopper
Fixing up comment headers for split up code.
 r2391 # hgweb/__init__.py - web interface to a mercurial repository
Eric Hopper
Moving hgweb.py into it's own module in preparation for breaking it up.
 r2311 #
# Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net>
# Copyright 2005 Matt Mackall <mpm@selenic.com>
#
Martin Geisler
updated license to be explicit about GPL version 2
 r8225 # This software may be used and distributed according to the terms of the
Matt Mackall
Update license to GPLv2+
 r10263 # GNU General Public License version 2 or any later version.
Eric Hopper
Moving hgweb.py into it's own module in preparation for breaking it up.
 r2311
Matt Mackall
hgweb: make hgweb.hgweb a unified interface to hgweb/hgwebdir
 r10996 import os
Matt Mackall
Replace demandload with new demandimport
 r3877 import hgweb_mod, hgwebdir_mod
Matt Mackall
hgweb: make hgweb.hgweb a unified interface to hgweb/hgwebdir
 r10996 def hgweb(config, name=None, baseui=None):
'''create an hgweb wsgi object
config can be one of:
- repo object (single repo view)
- path to repo (single repo view)
- path to config file (multi-repo view)
- dict of virtual:real pairs (multi-repo view)
- list of virtual:real tuples (multi-repo view)
'''
if ((isinstance(config, str) and not os.path.isdir(config)) or
isinstance(config, dict) or isinstance(config, list)):
# create a multi-dir interface
return hgwebdir_mod.hgwebdir(config, baseui=baseui)
return hgweb_mod.hgweb(config, name=name, baseui=baseui)
Matt Mackall
Replace demandload with new demandimport
 r3877
Matt Mackall
hgweb: make top-level prototypes mirror their callees
 r10992 def hgwebdir(config, baseui=None):
return hgwebdir_mod.hgwebdir(config, baseui=baseui)
Matt Mackall
Replace demandload with new demandimport
 r3877