findrenames: Optimise "addremove -s100" by matching files by their SHA1 hashes.
We speed up 'findrenames' for the usecase when a user specifies they
want a similarity of 100% by matching files by their exact SHA1 hash
value. This reduces the number of comparisons required to find exact
matches from O(n^2) to O(n).
While it would be nice if we could just use mercurial's pre-calculated
SHA1 hash for existing files, this hash includes the file's ancestor
information making it unsuitable for our purposes. Instead, we calculate
the hash of old content from scratch.
The following benchmarks were taken on the current head of crew:
addremove 100% similarity:
rm -rf *; hg up -C; mv tests tests.new
hg --time addremove -s100 --dry-run
before: real 176.350 secs (user 128.890+0.000 sys 47.430+0.000)
after: real 2.130 secs (user 1.890+0.000 sys 0.240+0.000)
addremove 75% similarity:
rm -rf *; hg up -C; mv tests tests.new; \
for i in tests.new/*; do echo x >> $i; done
hg --time addremove -s75 --dry-run
before: real 264.560 secs (user 215.130+0.000 sys 49.410+0.000)
after: real 218.710 secs (user 172.790+0.000 sys 45.870+0.000)
#!/bin/sh
# This tests if hgweb and hgwebdir still work if the REQUEST_URI variable is
# no longer passed with the request. Instead, SCRIPT_NAME and PATH_INFO
# should be used from d74fc8dec2b4 onward to route the request.
mkdir repo
cd repo
hg init
echo foo > bar
hg add bar
hg commit -m "test" -u "Testing"
hg tip
cat > request.py <<EOF
from mercurial.hgweb import hgweb, hgwebdir
from StringIO import StringIO
import os, sys
errors = StringIO()
input = StringIO()
def startrsp(headers, data):
print '---- HEADERS'
print headers
print '---- DATA'
print data
return output.write
env = {
'wsgi.version': (1, 0),
'wsgi.url_scheme': 'http',
'wsgi.errors': errors,
'wsgi.input': input,
'wsgi.multithread': False,
'wsgi.multiprocess': False,
'wsgi.run_once': False,
'REQUEST_METHOD': 'GET',
'SCRIPT_NAME': '',
'SERVER_NAME': '127.0.0.1',
'SERVER_PORT': os.environ['HGPORT'],
'SERVER_PROTOCOL': 'HTTP/1.0'
}
def process(app):
content = app(env, startrsp)
sys.stdout.write(output.getvalue())
sys.stdout.write(''.join(content))
print '---- ERRORS'
print errors.getvalue()
output = StringIO()
env['QUERY_STRING'] = 'style=atom'
process(hgweb('.', name='repo'))
output = StringIO()
env['QUERY_STRING'] = 'style=raw'
process(hgwebdir({'repo': '.'}))
EOF
python request.py | sed "s/http:\/\/127\.0\.0\.1:[0-9]*\//http:\/\/127.0.0.1\//"