revset: speed up '_matchfiles'
File matching is done by applying the matcher to all elements in the 'file'
field of all changesets in the repository. This requires to read/parse all
changesets in the repository and do a lot of matching. However about 1/3 of the
time of the function is used to create 'changectx' object and retrieve their
'file' field.
This is far too much overhead so we are skipping the changectx layer and
directly access the data from the changelog. This provide use significant speed
up:
repository: mozilla central 252524 revisions
command: hg perfrevset '_matchfiles("p:browser")'
Before: 15.899687s
After: 10.011705s
Slowdown is even more significant if you have a lot of namespace that slowdown
lookup.
The time is now spent with this approximate repartition:
Matcher: 20%
regexp matching: 10%
changelog.read: 80%
reading revision: 60%
checking hash: 15%
decompression: 15%
reading chunk: 30%
changelog parsing: 20%
decoding to local: 10%
The next easy win is probably to have more of the changelog stack implemented
using the CPython api.
#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also https://mercurial-scm.org/wiki/PublishingRepositories
# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "/path/to/repo/or/config"
# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
#import sys; sys.path.insert(0, "/path/to/python/lib")
# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb; cgitb.enable()
from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)