Optimize manifest.add Testing shows that manifest.add is spending a significant percentage of its time running calcoffsets and doing text = "".join(addlist). This patch removes the need for both of these by storying the manifest in a character array, and using a modified bisect search to find lines without the help of a separate index of line offsets. manifest.add was also reworked to push delta construction/combination into the main loop. Time to apply 2751 patches (without psyco, ext3 noatime,data=writeback): Stock hg: 4m45s real 3m32s user 55s sys patched: 2m48s real 1m53s user 43s sys quilt: 2m30s real 45s user 50s sys (quilt does much more io...)

#!/bin/sh

hg clone http://localhost:20059/ copy
echo $?
ls copy

cat > dumb.py <<EOF
import BaseHTTPServer, SimpleHTTPServer, signal

def run(server_class=BaseHTTPServer.HTTPServer,
        handler_class=SimpleHTTPServer.SimpleHTTPRequestHandler):
    server_address = ('localhost', 20059)
    httpd = server_class(server_address, handler_class)
    httpd.serve_forever()

signal.signal(signal.SIGTERM, lambda x: sys.exit(0))
run()
EOF

python dumb.py 2>/dev/null &

hg clone http://localhost:20059/foo copy2
echo $?

kill $!