Mercurial > hg
annotate mercurial/repocache.py @ 47387:75e1104f23a2
revlog: use dedicated code for reading sidedata
We are about to introduce a new, dedicated, file to store sidedata. Before doing so, we make sidedata reading go through different code as reading data chunk. This will simplify some of the complexity of the next changesets.
The reading is very simple right now and will need some improvement later to
reuse some of the caching strategy we use for the data file.
Differential Revision: https://phab.mercurial-scm.org/D10785
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Thu, 27 May 2021 04:09:30 +0200 |
parents | 8ff1ecfadcd1 |
children | 6000f5b25c9b |
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1 # repocache.py - in-memory repository cache for long-running services |
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2 # |
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3 # Copyright 2018 Yuya Nishihara <yuya@tcha.org> |
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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 |
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8 from __future__ import absolute_import |
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9 |
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10 import collections |
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11 import gc |
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12 import threading |
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13 |
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14 from . import ( |
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15 error, |
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16 hg, |
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17 obsolete, |
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18 scmutil, |
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19 util, |
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20 ) |
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21 |
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22 |
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23 class repoloader(object): |
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24 """Load repositories in background thread |
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25 |
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26 This is designed for a forking server. A cached repo cannot be obtained |
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27 until the server fork()s a worker and the loader thread stops. |
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28 """ |
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29 |
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30 def __init__(self, ui, maxlen): |
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31 self._ui = ui.copy() |
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32 self._cache = util.lrucachedict(max=maxlen) |
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33 # use deque and Event instead of Queue since deque can discard |
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34 # old items to keep at most maxlen items. |
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35 self._inqueue = collections.deque(maxlen=maxlen) |
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36 self._accepting = False |
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37 self._newentry = threading.Event() |
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38 self._thread = None |
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39 |
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40 def start(self): |
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41 assert not self._thread |
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42 if self._inqueue.maxlen == 0: |
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43 # no need to spawn loader thread as the cache is disabled |
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44 return |
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45 self._accepting = True |
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46 self._thread = threading.Thread(target=self._mainloop) |
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47 self._thread.start() |
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48 |
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49 def stop(self): |
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50 if not self._thread: |
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51 return |
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52 self._accepting = False |
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53 self._newentry.set() |
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54 self._thread.join() |
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55 self._thread = None |
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56 self._cache.clear() |
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57 self._inqueue.clear() |
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58 |
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59 def load(self, path): |
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60 """Request to load the specified repository in background""" |
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61 self._inqueue.append(path) |
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62 self._newentry.set() |
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63 |
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64 def get(self, path): |
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65 """Return a cached repo if available |
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66 |
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67 This function must be called after fork(), where the loader thread |
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68 is stopped. Otherwise, the returned repo might be updated by the |
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69 loader thread. |
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70 """ |
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71 if self._thread and self._thread.is_alive(): |
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72 raise error.ProgrammingError( |
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73 b'cannot obtain cached repo while loader is active' |
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74 ) |
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75 return self._cache.peek(path, None) |
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76 |
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77 def _mainloop(self): |
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78 while self._accepting: |
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79 # Avoid heavy GC after fork(), which would cancel the benefit of |
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80 # COW. We assume that GIL is acquired while GC is underway in the |
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81 # loader thread. If that isn't true, we might have to move |
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82 # gc.collect() to the main thread so that fork() would never stop |
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83 # the thread where GC is in progress. |
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84 gc.collect() |
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85 |
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86 self._newentry.wait() |
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87 while self._accepting: |
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88 self._newentry.clear() |
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89 try: |
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90 path = self._inqueue.popleft() |
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91 except IndexError: |
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92 break |
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93 scmutil.callcatch(self._ui, lambda: self._load(path)) |
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94 |
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95 def _load(self, path): |
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96 start = util.timer() |
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97 # TODO: repo should be recreated if storage configuration changed |
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98 try: |
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99 # pop before loading so inconsistent state wouldn't be exposed |
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100 repo = self._cache.pop(path) |
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101 except KeyError: |
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102 repo = hg.repository(self._ui, path).unfiltered() |
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103 _warmupcache(repo) |
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104 repo.ui.log( |
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105 b'repocache', |
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106 b'loaded repo into cache: %s (in %.3fs)\n', |
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107 path, |
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108 util.timer() - start, |
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109 ) |
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110 self._cache.insert(path, repo) |
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111 |
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112 |
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113 # TODO: think about proper API of preloading cache |
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114 def _warmupcache(repo): |
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115 repo.invalidateall() |
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116 repo.changelog |
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117 repo.obsstore._all |
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118 repo.obsstore.successors |
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119 repo.obsstore.predecessors |
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120 repo.obsstore.children |
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121 for name in obsolete.cachefuncs: |
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122 obsolete.getrevs(repo, name) |
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123 repo._phasecache.loadphaserevs(repo) |
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124 |
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125 |
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126 # TODO: think about proper API of attaching preloaded attributes |
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127 def copycache(srcrepo, destrepo): |
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128 """Copy cached attributes from srcrepo to destrepo""" |
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129 destfilecache = destrepo._filecache |
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130 srcfilecache = srcrepo._filecache |
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131 if b'changelog' in srcfilecache: |
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132 destfilecache[b'changelog'] = ce = srcfilecache[b'changelog'] |
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133 ce.obj.opener = ce.obj._realopener = destrepo.svfs |
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134 if b'obsstore' in srcfilecache: |
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135 destfilecache[b'obsstore'] = ce = srcfilecache[b'obsstore'] |
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136 ce.obj.svfs = destrepo.svfs |
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137 if b'_phasecache' in srcfilecache: |
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138 destfilecache[b'_phasecache'] = ce = srcfilecache[b'_phasecache'] |
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139 ce.obj.opener = destrepo.svfs |