annotate mercurial/repocache.py @ 45237:39f4ec4039a8

commitctx: move a special case about files earlier Same logic as a changeset a bit earlier, the `writefilecopymeta` section is more a post processing details so we move the conditional about `files` value closer to the rest of the code computing `files` value.
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Thu, 23 Jul 2020 23:40:59 +0200
parents 8ff1ecfadcd1
children 6000f5b25c9b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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