Mercurial > hg
annotate mercurial/metadata.py @ 44940:4c1d39215034
metadata: move computation related to files touched in a dedicated module
This was suggested by Yuya Nishihara a while back. Since I am about to add more
metadata related computation, lets create a new repositories.
Differential Revision: https://phab.mercurial-scm.org/D8587
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 27 May 2020 12:26:08 +0200 |
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children | edd08aa193fb |
rev | line source |
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44940
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1 # metadata.py -- code related to various metadata computation and access. |
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2 # |
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3 # Copyright 2019 Google, Inc <martinvonz@google.com> |
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4 # Copyright 2020 Pierre-Yves David <pierre-yves.david@octobus.net> |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
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7 # GNU General Public License version 2 or any later version. |
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8 from __future__ import absolute_import, print_function |
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9 |
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10 import multiprocessing |
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11 |
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12 from . import ( |
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13 error, |
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14 pycompat, |
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15 util, |
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16 ) |
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17 |
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18 from .revlogutils import ( |
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19 flagutil as sidedataflag, |
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20 sidedata as sidedatamod, |
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21 ) |
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22 |
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23 |
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24 def computechangesetfilesadded(ctx): |
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25 """return the list of files added in a changeset |
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26 """ |
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27 added = [] |
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28 for f in ctx.files(): |
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29 if not any(f in p for p in ctx.parents()): |
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30 added.append(f) |
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31 return added |
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32 |
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33 |
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34 def computechangesetfilesremoved(ctx): |
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35 """return the list of files removed in a changeset |
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36 """ |
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37 removed = [] |
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38 for f in ctx.files(): |
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39 if f not in ctx: |
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40 removed.append(f) |
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41 return removed |
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42 |
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43 |
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44 def computechangesetcopies(ctx): |
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45 """return the copies data for a changeset |
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46 |
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47 The copies data are returned as a pair of dictionnary (p1copies, p2copies). |
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48 |
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49 Each dictionnary are in the form: `{newname: oldname}` |
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50 """ |
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51 p1copies = {} |
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52 p2copies = {} |
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53 p1 = ctx.p1() |
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54 p2 = ctx.p2() |
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55 narrowmatch = ctx._repo.narrowmatch() |
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56 for dst in ctx.files(): |
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57 if not narrowmatch(dst) or dst not in ctx: |
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58 continue |
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59 copied = ctx[dst].renamed() |
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60 if not copied: |
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61 continue |
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62 src, srcnode = copied |
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63 if src in p1 and p1[src].filenode() == srcnode: |
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64 p1copies[dst] = src |
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65 elif src in p2 and p2[src].filenode() == srcnode: |
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66 p2copies[dst] = src |
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67 return p1copies, p2copies |
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68 |
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69 |
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70 def encodecopies(files, copies): |
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71 items = [] |
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72 for i, dst in enumerate(files): |
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73 if dst in copies: |
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74 items.append(b'%d\0%s' % (i, copies[dst])) |
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75 if len(items) != len(copies): |
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76 raise error.ProgrammingError( |
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77 b'some copy targets missing from file list' |
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78 ) |
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79 return b"\n".join(items) |
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80 |
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81 |
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82 def decodecopies(files, data): |
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83 try: |
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84 copies = {} |
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85 if not data: |
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86 return copies |
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87 for l in data.split(b'\n'): |
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88 strindex, src = l.split(b'\0') |
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89 i = int(strindex) |
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90 dst = files[i] |
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91 copies[dst] = src |
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92 return copies |
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93 except (ValueError, IndexError): |
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94 # Perhaps someone had chosen the same key name (e.g. "p1copies") and |
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95 # used different syntax for the value. |
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96 return None |
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97 |
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98 |
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99 def encodefileindices(files, subset): |
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100 subset = set(subset) |
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101 indices = [] |
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102 for i, f in enumerate(files): |
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103 if f in subset: |
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104 indices.append(b'%d' % i) |
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105 return b'\n'.join(indices) |
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106 |
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107 |
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108 def decodefileindices(files, data): |
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109 try: |
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110 subset = [] |
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111 if not data: |
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112 return subset |
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113 for strindex in data.split(b'\n'): |
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114 i = int(strindex) |
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115 if i < 0 or i >= len(files): |
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116 return None |
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117 subset.append(files[i]) |
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118 return subset |
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119 except (ValueError, IndexError): |
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120 # Perhaps someone had chosen the same key name (e.g. "added") and |
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121 # used different syntax for the value. |
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122 return None |
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123 |
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124 |
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125 def _getsidedata(srcrepo, rev): |
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126 ctx = srcrepo[rev] |
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127 filescopies = computechangesetcopies(ctx) |
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128 filesadded = computechangesetfilesadded(ctx) |
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129 filesremoved = computechangesetfilesremoved(ctx) |
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130 sidedata = {} |
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131 if any([filescopies, filesadded, filesremoved]): |
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132 sortedfiles = sorted(ctx.files()) |
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133 p1copies, p2copies = filescopies |
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134 p1copies = encodecopies(sortedfiles, p1copies) |
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135 p2copies = encodecopies(sortedfiles, p2copies) |
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136 filesadded = encodefileindices(sortedfiles, filesadded) |
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137 filesremoved = encodefileindices(sortedfiles, filesremoved) |
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138 if p1copies: |
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139 sidedata[sidedatamod.SD_P1COPIES] = p1copies |
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140 if p2copies: |
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141 sidedata[sidedatamod.SD_P2COPIES] = p2copies |
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142 if filesadded: |
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143 sidedata[sidedatamod.SD_FILESADDED] = filesadded |
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144 if filesremoved: |
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145 sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved |
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146 return sidedata |
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147 |
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148 |
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149 def getsidedataadder(srcrepo, destrepo): |
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150 use_w = srcrepo.ui.configbool(b'experimental', b'worker.repository-upgrade') |
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151 if pycompat.iswindows or not use_w: |
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152 return _get_simple_sidedata_adder(srcrepo, destrepo) |
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153 else: |
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154 return _get_worker_sidedata_adder(srcrepo, destrepo) |
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155 |
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156 |
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157 def _sidedata_worker(srcrepo, revs_queue, sidedata_queue, tokens): |
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158 """The function used by worker precomputing sidedata |
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159 |
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160 It read an input queue containing revision numbers |
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161 It write in an output queue containing (rev, <sidedata-map>) |
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162 |
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163 The `None` input value is used as a stop signal. |
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164 |
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165 The `tokens` semaphore is user to avoid having too many unprocessed |
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166 entries. The workers needs to acquire one token before fetching a task. |
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167 They will be released by the consumer of the produced data. |
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168 """ |
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169 tokens.acquire() |
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170 rev = revs_queue.get() |
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171 while rev is not None: |
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172 data = _getsidedata(srcrepo, rev) |
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173 sidedata_queue.put((rev, data)) |
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174 tokens.acquire() |
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175 rev = revs_queue.get() |
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176 # processing of `None` is completed, release the token. |
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177 tokens.release() |
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178 |
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179 |
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180 BUFF_PER_WORKER = 50 |
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181 |
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182 |
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183 def _get_worker_sidedata_adder(srcrepo, destrepo): |
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184 """The parallel version of the sidedata computation |
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185 |
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186 This code spawn a pool of worker that precompute a buffer of sidedata |
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187 before we actually need them""" |
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188 # avoid circular import copies -> scmutil -> worker -> copies |
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189 from . import worker |
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190 |
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191 nbworkers = worker._numworkers(srcrepo.ui) |
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192 |
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193 tokens = multiprocessing.BoundedSemaphore(nbworkers * BUFF_PER_WORKER) |
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194 revsq = multiprocessing.Queue() |
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195 sidedataq = multiprocessing.Queue() |
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196 |
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197 assert srcrepo.filtername is None |
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198 # queue all tasks beforehand, revision numbers are small and it make |
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199 # synchronisation simpler |
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200 # |
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201 # Since the computation for each node can be quite expensive, the overhead |
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202 # of using a single queue is not revelant. In practice, most computation |
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203 # are fast but some are very expensive and dominate all the other smaller |
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204 # cost. |
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205 for r in srcrepo.changelog.revs(): |
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206 revsq.put(r) |
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207 # queue the "no more tasks" markers |
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208 for i in range(nbworkers): |
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209 revsq.put(None) |
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210 |
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211 allworkers = [] |
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212 for i in range(nbworkers): |
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213 args = (srcrepo, revsq, sidedataq, tokens) |
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214 w = multiprocessing.Process(target=_sidedata_worker, args=args) |
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215 allworkers.append(w) |
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216 w.start() |
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217 |
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218 # dictionnary to store results for revision higher than we one we are |
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219 # looking for. For example, if we need the sidedatamap for 42, and 43 is |
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220 # received, when shelve 43 for later use. |
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221 staging = {} |
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222 |
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223 def sidedata_companion(revlog, rev): |
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224 sidedata = {} |
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225 if util.safehasattr(revlog, b'filteredrevs'): # this is a changelog |
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226 # Is the data previously shelved ? |
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227 sidedata = staging.pop(rev, None) |
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228 if sidedata is None: |
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229 # look at the queued result until we find the one we are lookig |
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230 # for (shelve the other ones) |
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231 r, sidedata = sidedataq.get() |
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232 while r != rev: |
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233 staging[r] = sidedata |
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234 r, sidedata = sidedataq.get() |
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235 tokens.release() |
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236 return False, (), sidedata |
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237 |
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238 return sidedata_companion |
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239 |
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240 |
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241 def _get_simple_sidedata_adder(srcrepo, destrepo): |
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242 """The simple version of the sidedata computation |
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243 |
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244 It just compute it in the same thread on request""" |
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245 |
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246 def sidedatacompanion(revlog, rev): |
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247 sidedata = {} |
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248 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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249 sidedata = _getsidedata(srcrepo, rev) |
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250 return False, (), sidedata |
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251 |
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252 return sidedatacompanion |
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253 |
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254 |
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255 def getsidedataremover(srcrepo, destrepo): |
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256 def sidedatacompanion(revlog, rev): |
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257 f = () |
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258 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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259 if revlog.flags(rev) & sidedataflag.REVIDX_SIDEDATA: |
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260 f = ( |
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261 sidedatamod.SD_P1COPIES, |
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262 sidedatamod.SD_P2COPIES, |
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263 sidedatamod.SD_FILESADDED, |
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264 sidedatamod.SD_FILESREMOVED, |
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265 ) |
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266 return False, f, {} |
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267 |
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268 return sidedatacompanion |