upstream/mercurial-mirror Files · hgext/inotify/common.py

bdiff: gradually enable the popularity hack...

bdiff: gradually enable the popularity hack Patch from Jason Orendorff The lower the threshold, the stronger the popularity hack's influence. So at 3999 lines, the hack is disabled; and at 4000 lines, the hack is enabled at maximum strength (t=4). No source file in mercurial/crew is over 4000 lines. But there are, oh, a few such files in Mozilla. I can testify that this hack causes hg to generate some correct but eyebrow-raising patches. I think the hack should phase in gradually. The threshold should be high for small files where we don't need it so much. Like this: t = (bn < 31000) ? 1000000 / bn : bn / 1000; That would leave the popularity hack disabled for small files, then gradually phase it in: bn < 1000 -- t > bn (popularity hack is completely disabled) bn == 1000 -- t = 1000 (still effectively disabled) bn == 2000 -- t = 500 (only hits unusual files) bn == 10000 -- t = 100 (only hits especially common lines) bn == 31000 -- t = 31 (hack is at maximum power) bn == 32000 -- t = 32 (hack could backfire, ease off)

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      # server.py - inotify common protocol code

      #

      # Copyright 2006, 2007, 2008 Bryan O'Sullivan <bos@serpentine.com>

      # Copyright 2007, 2008 Brendan Cully <brendan@kublai.com>

      #

      # This software may be used and distributed according to the terms of the

      # GNU General Public License version 2, incorporated herein by reference.

      import cStringIO, socket, struct

      """

        Protocol between inotify clients and server:

        Client sending query:

        1) send protocol version number

        2) send query type (string, 4 letters long)

        3) send query parameters:

           - For STAT, N+1 \0-separated strings:

              1) N different names that need checking

              2) 1 string containing all the status types to match

           - No parameter needed for DBUG

        Server sending query answer:

        1) send protocol version number

        2) send query type

        3) send struct.pack'ed headers describing the length of the content:

            e.g. for STAT, receive 8 integers describing the length of the

            8 \0-separated string lists ( one list for each lmar!?ic status type )

      """

      version = 2

      resphdrfmts = {

          'STAT': '>llllllll', # status requests

          'DBUG': '>l'         # debugging queries

      }

      resphdrsizes = dict((k, struct.calcsize(v))

                          for k, v in resphdrfmts.iteritems())

      def recvcs(sock):

          cs = cStringIO.StringIO()

          s = True

          try:

              while s:

                  s = sock.recv(65536)

                  cs.write(s)

          finally:

              sock.shutdown(socket.SHUT_RD)

          cs.seek(0)

          return cs

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				# server.py - inotify common protocol code
				#
				# Copyright 2006, 2007, 2008 Bryan O'Sullivan <bos@serpentine.com>
				# Copyright 2007, 2008 Brendan Cully <brendan@kublai.com>
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2, incorporated herein by reference.

				import cStringIO, socket, struct

				"""
				Protocol between inotify clients and server:

				Client sending query:
				1) send protocol version number
				2) send query type (string, 4 letters long)
				3) send query parameters:
				- For STAT, N+1 \0-separated strings:
				1) N different names that need checking
				2) 1 string containing all the status types to match
				- No parameter needed for DBUG

				Server sending query answer:
				1) send protocol version number
				2) send query type
				3) send struct.pack'ed headers describing the length of the content:
				e.g. for STAT, receive 8 integers describing the length of the
				8 \0-separated string lists ( one list for each lmar!?ic status type )

				"""

				version = 2

				resphdrfmts = {
				'STAT': '>llllllll', # status requests
				'DBUG': '>l' # debugging queries
				}
				resphdrsizes = dict((k, struct.calcsize(v))
				for k, v in resphdrfmts.iteritems())

				def recvcs(sock):
				cs = cStringIO.StringIO()
				s = True
				try:
				while s:
				s = sock.recv(65536)
				cs.write(s)
				finally:
				sock.shutdown(socket.SHUT_RD)
				cs.seek(0)
				return cs