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revlog: linearize created changegroups in generaldelta revlogs...
revlog: linearize created changegroups in generaldelta revlogs This greatly improves the speed of the bundling process, and often reduces the bundle size considerably. (Although if the repository is already ordered, this has little effect on both time and bundle size.) For non-generaldelta clients, the reduced bundle size translates to a reduced repository size, similar to shrinking the revlogs (which uses the exact same algorithm). For generaldelta clients the difference is minor. When the new bundle format comes, reordering will not be necessary since we can then store the deltaparent relationsships directly. The eventual default behavior for clients and servers is presented in the table below, where "new" implies support for GD as well as the new bundle format: old client new client old server old bundle, no reorder old bundle, no reorder new server, non-GD old bundle, no reorder[1] old bundle, no reorder[2] new server, GD old bundle, reorder[3] new bundle, no reorder[4] [1] reordering is expensive on the server in this case, skip it [2] client can choose to do its own redelta here [3] reordering is needed because otherwise the pull does a lot of extra work on the server [4] reordering isn't needed because client can get deltabase in bundle format Currently, the default is to reorder on GD-servers, and not otherwise. A new setting, bundle.reorder, has been added to override the default reordering behavior. It can be set to either 'auto' (the default), or any true or false value as a standard boolean setting, to either force the reordering on or off regardless of generaldelta. Some timing data from a relatively branch test repository follows. All bundling is done with --all --type none options. Non-generaldelta, non-shrunk repo: ----------------------------------- Size: 276M Without reorder (default): Bundle time: 14.4 seconds Bundle size: 939M With reorder: Bundle time: 1 minute, 29.3 seconds Bundle size: 381M Generaldelta, non-shrunk repo: ----------------------------------- Size: 87M Without reorder: Bundle time: 2 minutes, 1.4 seconds Bundle size: 939M With reorder (default): Bundle time: 25.5 seconds Bundle size: 381M
Matt Mackall - - Load All Authors

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r14365:a8e3931e default
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node.py
18 lines | 449 B | text/x-python | PythonLexer
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Martin Geisler
put license and copyright info into comment blocks
 r8226 # node.py - basic nodeid manipulation for mercurial
#
# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
#
# 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.
mpm@selenic.com
Break apart hg.py...
 r1089
Matt Mackall
Replace demandload with new demandimport
 r3877 import binascii
mpm@selenic.com
Break apart hg.py...
 r1089
Thomas Arendsen Hein
Define and use nullrev (revision of nullid) instead of -1.
 r3578 nullrev = -1
mpm@selenic.com
Break apart hg.py...
 r1089 nullid = "\0" * 20
Matt Mackall
manifest: speed up creation of the manifestdict...
 r4995 # This ugly style has a noticeable effect in manifest parsing
hex = binascii.hexlify
bin = binascii.unhexlify
mpm@selenic.com
Break apart hg.py...
 r1089
def short(node):
return hex(node[:6])