Mercurial > hg
annotate hgext/fastannotate/__init__.py @ 42947:0152a907f714
fastannotate: remove support for flock() locking
We've seen enough weirdness in CI with flock for remotefilelog that
I'm now of the opinion we should just stop using flock() everywhere
until someone has a concrete need for the extra performance *and* a
way to only use it when safe (even if that's just default-to-off.)
Differential Revision: https://phab.mercurial-scm.org/D6861
author | Augie Fackler <augie@google.com> |
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date | Tue, 17 Sep 2019 14:22:22 -0400 |
parents | c841e8855cd3 |
children | 2372284d9457 |
rev | line source |
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1 # Copyright 2016-present Facebook. All Rights Reserved. |
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2 # |
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3 # fastannotate: faster annotate implementation using linelog |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 """yet another annotate implementation that might be faster (EXPERIMENTAL) |
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8 |
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9 The fastannotate extension provides a 'fastannotate' command that makes |
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10 use of the linelog data structure as a cache layer and is expected to |
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11 be faster than the vanilla 'annotate' if the cache is present. |
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12 |
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13 In most cases, fastannotate requires a setup that mainbranch is some pointer |
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14 that always moves forward, to be most efficient. |
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15 |
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16 Using fastannotate together with linkrevcache would speed up building the |
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17 annotate cache greatly. Run "debugbuildlinkrevcache" before |
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18 "debugbuildannotatecache". |
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19 |
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20 :: |
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21 |
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22 [fastannotate] |
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23 # specify the main branch head. the internal linelog will only contain |
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24 # the linear (ignoring p2) "mainbranch". since linelog cannot move |
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25 # backwards without a rebuild, this should be something that always moves |
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26 # forward, usually it is "master" or "@". |
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27 mainbranch = master |
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28 |
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29 # fastannotate supports different modes to expose its feature. |
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30 # a list of combination: |
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31 # - fastannotate: expose the feature via the "fastannotate" command which |
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32 # deals with everything in a most efficient way, and provides extra |
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33 # features like --deleted etc. |
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34 # - fctx: replace fctx.annotate implementation. note: |
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35 # a. it is less efficient than the "fastannotate" command |
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36 # b. it will make it practically impossible to access the old (disk |
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37 # side-effect free) annotate implementation |
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38 # c. it implies "hgweb". |
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39 # - hgweb: replace hgweb's annotate implementation. conflict with "fctx". |
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40 # (default: fastannotate) |
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41 modes = fastannotate |
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42 |
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43 # default format when no format flags are used (default: number) |
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44 defaultformat = changeset, user, date |
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45 |
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46 # serve the annotate cache via wire protocol (default: False) |
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47 # tip: the .hg/fastannotate directory is portable - can be rsynced |
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48 server = True |
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49 |
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50 # build annotate cache on demand for every client request (default: True) |
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51 # disabling it could make server response faster, useful when there is a |
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52 # cronjob building the cache. |
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53 serverbuildondemand = True |
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54 |
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55 # update local annotate cache from remote on demand |
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56 client = False |
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57 |
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58 # path to use when connecting to the remote server (default: default) |
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59 remotepath = default |
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60 |
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61 # minimal length of the history of a file required to fetch linelog from |
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62 # the server. (default: 10) |
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63 clientfetchthreshold = 10 |
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64 |
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65 # for "fctx" mode, always follow renames regardless of command line option. |
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66 # this is a BC with the original command but will reduced the space needed |
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67 # for annotate cache, and is useful for client-server setup since the |
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68 # server will only provide annotate cache with default options (i.e. with |
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69 # follow). do not affect "fastannotate" mode. (default: True) |
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70 forcefollow = True |
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71 |
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72 # for "fctx" mode, always treat file as text files, to skip the "isbinary" |
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73 # check. this is consistent with the "fastannotate" command and could help |
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74 # to avoid a file fetch if remotefilelog is used. (default: True) |
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75 forcetext = True |
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76 |
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77 # use unfiltered repo for better performance. |
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78 unfilteredrepo = True |
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79 |
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80 # sacrifice correctness in some corner cases for performance. it does not |
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81 # affect the correctness of the annotate cache being built. the option |
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82 # is experimental and may disappear in the future (default: False) |
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83 perfhack = True |
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84 """ |
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85 |
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86 # TODO from import: |
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87 # * `branch` is probably the wrong term, throughout the code. |
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88 # |
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89 # * replace the fastannotate `modes` configuration with a collection |
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90 # of booleans. |
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91 # |
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92 # * Use the templater instead of bespoke formatting |
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93 # |
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94 # * rename the config knob for updating the local cache from a remote server |
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95 # |
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96 # * revise wireprotocol for sharing annotate files |
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97 # |
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98 # * figure out a sensible default for `mainbranch` (with the caveat |
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99 # that we probably also want to figure out a better term than |
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100 # `branch`, see above) |
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101 # |
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102 # * format changes to the revmap file (maybe use length-encoding |
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103 # instead of null-terminated file paths at least?) |
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104 from __future__ import absolute_import |
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105 |
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106 from mercurial.i18n import _ |
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107 from mercurial import ( |
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108 error as hgerror, |
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109 localrepo, |
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110 registrar, |
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111 ) |
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112 |
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113 from . import ( |
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114 commands, |
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115 protocol, |
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116 ) |
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117 |
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118 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for |
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119 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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120 # be specifying the version(s) of Mercurial they are tested with, or |
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121 # leave the attribute unspecified. |
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122 testedwith = 'ships-with-hg-core' |
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123 |
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124 cmdtable = commands.cmdtable |
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125 |
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126 configtable = {} |
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127 configitem = registrar.configitem(configtable) |
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128 |
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129 configitem('fastannotate', 'modes', default=['fastannotate']) |
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130 configitem('fastannotate', 'server', default=False) |
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131 configitem('fastannotate', 'client', default=False) |
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132 configitem('fastannotate', 'unfilteredrepo', default=True) |
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133 configitem('fastannotate', 'defaultformat', default=['number']) |
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134 configitem('fastannotate', 'perfhack', default=False) |
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135 configitem('fastannotate', 'mainbranch') |
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136 configitem('fastannotate', 'forcetext', default=True) |
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137 configitem('fastannotate', 'forcefollow', default=True) |
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138 configitem('fastannotate', 'clientfetchthreshold', default=10) |
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139 configitem('fastannotate', 'serverbuildondemand', default=True) |
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140 configitem('fastannotate', 'remotepath', default='default') |
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141 |
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142 |
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143 def uisetup(ui): |
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144 modes = set(ui.configlist('fastannotate', 'modes')) |
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145 if 'fctx' in modes: |
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146 modes.discard('hgweb') |
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147 for name in modes: |
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148 if name == 'fastannotate': |
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149 commands.registercommand() |
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150 elif name == 'hgweb': |
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151 from . import support |
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152 support.replacehgwebannotate() |
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153 elif name == 'fctx': |
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154 from . import support |
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155 support.replacefctxannotate() |
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156 commands.wrapdefault() |
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157 else: |
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158 raise hgerror.Abort(_('fastannotate: invalid mode: %s') % name) |
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159 |
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160 if ui.configbool('fastannotate', 'server'): |
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161 protocol.serveruisetup(ui) |
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162 |
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163 def extsetup(ui): |
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164 # fastannotate has its own locking, without depending on repo lock |
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165 # TODO: avoid mutating this unless the specific repo has it enabled |
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166 localrepo.localrepository._wlockfreeprefix.add('fastannotate/') |
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167 |
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168 def reposetup(ui, repo): |
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169 if ui.configbool('fastannotate', 'client'): |
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170 protocol.clientreposetup(ui, repo) |