annotate mercurial/repocache.py @ 51582:d8287e43540f

phases: stop using `repo.set` in `remotephasessummary` The `repository.set` create changectx on the fly, an expensive operation. Using `repo.revs` and a direct rev-num → node-id translation will be significantly faster. This is especially true as we prepare ourself to no longer do the rev-num → node-id transalation there. The speedup is a bit lost in the overall noisyness of the slow phase discovery algorithm, but it save a small amount of time in my benchmark.
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Fri, 05 Apr 2024 12:24:47 +0200
parents 630d5283ee82
children f4733654f144
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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
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9 import collections
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10 import gc
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11 import threading
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12
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13 from . import (
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14 error,
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15 hg,
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16 obsolete,
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17 scmutil,
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18 util,
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19 )
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20
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21
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22 class repoloader:
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23 """Load repositories in background thread
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24
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25 This is designed for a forking server. A cached repo cannot be obtained
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26 until the server fork()s a worker and the loader thread stops.
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27 """
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28
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29 def __init__(self, ui, maxlen):
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30 self._ui = ui.copy()
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31 self._cache = util.lrucachedict(max=maxlen)
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32 # use deque and Event instead of Queue since deque can discard
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33 # old items to keep at most maxlen items.
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34 self._inqueue = collections.deque(maxlen=maxlen)
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35 self._accepting = False
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36 self._newentry = threading.Event()
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37 self._thread = None
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38
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39 def start(self):
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40 assert not self._thread
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41 if self._inqueue.maxlen == 0:
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42 # no need to spawn loader thread as the cache is disabled
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43 return
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44 self._accepting = True
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45 self._thread = threading.Thread(target=self._mainloop)
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46 self._thread.start()
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47
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48 def stop(self):
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49 if not self._thread:
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50 return
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51 self._accepting = False
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52 self._newentry.set()
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53 self._thread.join()
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54 self._thread = None
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55 self._cache.clear()
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56 self._inqueue.clear()
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57
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58 def load(self, path):
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59 """Request to load the specified repository in background"""
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60 self._inqueue.append(path)
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61 self._newentry.set()
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62
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63 def get(self, path):
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64 """Return a cached repo if available
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65
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66 This function must be called after fork(), where the loader thread
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67 is stopped. Otherwise, the returned repo might be updated by the
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68 loader thread.
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69 """
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70 if self._thread and self._thread.is_alive():
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71 raise error.ProgrammingError(
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72 b'cannot obtain cached repo while loader is active'
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73 )
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74 return self._cache.peek(path, None)
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75
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76 def _mainloop(self):
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77 while self._accepting:
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78 # Avoid heavy GC after fork(), which would cancel the benefit of
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79 # COW. We assume that GIL is acquired while GC is underway in the
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80 # loader thread. If that isn't true, we might have to move
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81 # gc.collect() to the main thread so that fork() would never stop
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82 # the thread where GC is in progress.
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83 gc.collect()
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84
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85 self._newentry.wait()
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86 while self._accepting:
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87 self._newentry.clear()
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88 try:
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89 path = self._inqueue.popleft()
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90 except IndexError:
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91 break
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92 scmutil.callcatch(self._ui, lambda: self._load(path))
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93
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94 def _load(self, path):
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95 start = util.timer()
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96 # TODO: repo should be recreated if storage configuration changed
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97 try:
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98 # pop before loading so inconsistent state wouldn't be exposed
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99 repo = self._cache.pop(path)
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100 except KeyError:
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101 repo = hg.repository(self._ui, path).unfiltered()
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102 _warmupcache(repo)
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103 repo.ui.log(
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104 b'repocache',
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105 b'loaded repo into cache: %s (in %.3fs)\n',
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106 path,
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107 util.timer() - start,
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108 )
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109 self._cache.insert(path, repo)
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110
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111
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112 # TODO: think about proper API of preloading cache
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113 def _warmupcache(repo):
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114 repo.invalidateall()
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115 repo.changelog
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116 repo.obsstore._all
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117 repo.obsstore.successors
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118 repo.obsstore.predecessors
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119 repo.obsstore.children
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120 for name in obsolete.cachefuncs:
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121 obsolete.getrevs(repo, name)
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122 # ensure the phase cache is fully initialized
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123 repo._phasecache.phase(repo, repo.changelog.tiprev())
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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._inner.opener = destrepo.svfs
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134 if b'obsstore' in srcfilecache:
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
135 destfilecache[b'obsstore'] = ce = srcfilecache[b'obsstore']
40999
dcac24ec935b commandserver: preload repository in master server and reuse its file cache
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
136 ce.obj.svfs = destrepo.svfs
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
137 if b'_phasecache' in srcfilecache:
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
138 destfilecache[b'_phasecache'] = ce = srcfilecache[b'_phasecache']
40999
dcac24ec935b commandserver: preload repository in master server and reuse its file cache
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
139 ce.obj.opener = destrepo.svfs