Mercurial > hg
annotate mercurial/worker.py @ 35011:a2dfc723b6b5
bundle: allow bundlerepo to support alternative manifest implementations
With our treemanifest logic, the manifests are no longer transported as part of
the changegroup and are no longer stored in a revlog. This means the
self.manifestlog line in bundlerepo.filestart no longer calls
_constructmanifest, and therefore does not consume the manifest portion of the
changegroup, which means filestart is not populated and we result in an infinite
loop.
The fix is to make filestart aware that self.manifestlog might not consume the
changegroup part, and consume it manually if necessary.
There's currently no way to test this in core, but our treemanifest extension
has tests to cover this.
Differential Revision: https://phab.mercurial-scm.org/D1329
author | Durham Goode <durham@fb.com> |
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date | Tue, 07 Nov 2017 10:16:53 -0800 |
parents | 238abf65a8ad |
children | 02b36e860e0b |
rev | line source |
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1 # worker.py - master-slave parallelism support |
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2 # |
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3 # Copyright 2013 Facebook, Inc. |
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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 errno |
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11 import os |
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12 import signal |
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13 import sys |
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14 |
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15 from .i18n import _ |
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17 encoding, |
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19 pycompat, |
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20 scmutil, |
30396 | 21 util, |
22 ) | |
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23 |
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24 def countcpus(): |
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25 '''try to count the number of CPUs on the system''' |
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26 |
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27 # posix |
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28 try: |
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29 n = int(os.sysconf(r'SC_NPROCESSORS_ONLN')) |
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30 if n > 0: |
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31 return n |
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32 except (AttributeError, ValueError): |
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33 pass |
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34 |
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35 # windows |
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36 try: |
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37 n = int(encoding.environ['NUMBER_OF_PROCESSORS']) |
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38 if n > 0: |
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39 return n |
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40 except (KeyError, ValueError): |
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41 pass |
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42 |
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43 return 1 |
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44 |
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45 def _numworkers(ui): |
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46 s = ui.config('worker', 'numcpus') |
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47 if s: |
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48 try: |
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49 n = int(s) |
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50 if n >= 1: |
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51 return n |
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52 except ValueError: |
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53 raise error.Abort(_('number of cpus must be an integer')) |
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54 return min(max(countcpus(), 4), 32) |
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55 |
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57 _startupcost = 0.01 |
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58 else: |
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59 _startupcost = 1e30 |
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60 |
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61 def worthwhile(ui, costperop, nops): |
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62 '''try to determine whether the benefit of multiple processes can |
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63 outweigh the cost of starting them''' |
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64 linear = costperop * nops |
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65 workers = _numworkers(ui) |
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66 benefit = linear - (_startupcost * workers + linear / workers) |
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67 return benefit >= 0.15 |
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68 |
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69 def worker(ui, costperarg, func, staticargs, args): |
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70 '''run a function, possibly in parallel in multiple worker |
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71 processes. |
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72 |
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73 returns a progress iterator |
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74 |
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75 costperarg - cost of a single task |
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76 |
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77 func - function to run |
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78 |
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79 staticargs - arguments to pass to every invocation of the function |
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80 |
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81 args - arguments to split into chunks, to pass to individual |
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82 workers |
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83 ''' |
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84 if worthwhile(ui, costperarg, len(args)): |
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85 return _platformworker(ui, func, staticargs, args) |
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86 return func(*staticargs + (args,)) |
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87 |
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88 def _posixworker(ui, func, staticargs, args): |
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89 rfd, wfd = os.pipe() |
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90 workers = _numworkers(ui) |
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91 oldhandler = signal.getsignal(signal.SIGINT) |
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92 signal.signal(signal.SIGINT, signal.SIG_IGN) |
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94 def killworkers(): |
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95 # unregister SIGCHLD handler as all children will be killed. This |
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96 # function shouldn't be interrupted by another SIGCHLD; otherwise pids |
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97 # could be updated while iterating, which would cause inconsistency. |
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98 signal.signal(signal.SIGCHLD, oldchldhandler) |
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99 # if one worker bails, there's no good reason to wait for the rest |
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100 for p in pids: |
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101 try: |
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102 os.kill(p, signal.SIGTERM) |
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103 except OSError as err: |
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104 if err.errno != errno.ESRCH: |
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105 raise |
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106 def waitforworkers(blocking=True): |
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107 for pid in pids.copy(): |
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108 p = st = 0 |
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109 while True: |
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110 try: |
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111 p, st = os.waitpid(pid, (0 if blocking else os.WNOHANG)) |
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112 break |
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113 except OSError as e: |
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114 if e.errno == errno.EINTR: |
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115 continue |
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116 elif e.errno == errno.ECHILD: |
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117 # child would already be reaped, but pids yet been |
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118 # updated (maybe interrupted just after waitpid) |
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119 pids.discard(pid) |
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120 break |
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121 else: |
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122 raise |
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123 if not p: |
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124 # skip subsequent steps, because child process should |
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125 # be still running in this case |
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126 continue |
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127 pids.discard(p) |
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128 st = _exitstatus(st) |
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129 if st and not problem[0]: |
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130 problem[0] = st |
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131 def sigchldhandler(signum, frame): |
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132 waitforworkers(blocking=False) |
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133 if problem[0]: |
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134 killworkers() |
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135 oldchldhandler = signal.signal(signal.SIGCHLD, sigchldhandler) |
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136 ui.flush() |
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137 parentpid = os.getpid() |
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138 for pargs in partition(args, workers): |
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139 # make sure we use os._exit in all worker code paths. otherwise the |
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140 # worker may do some clean-ups which could cause surprises like |
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141 # deadlock. see sshpeer.cleanup for example. |
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142 # override error handling *before* fork. this is necessary because |
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143 # exception (signal) may arrive after fork, before "pid =" assignment |
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144 # completes, and other exception handler (dispatch.py) can lead to |
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145 # unexpected code path without os._exit. |
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146 ret = -1 |
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147 try: |
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148 pid = os.fork() |
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149 if pid == 0: |
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150 signal.signal(signal.SIGINT, oldhandler) |
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151 signal.signal(signal.SIGCHLD, oldchldhandler) |
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152 |
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153 def workerfunc(): |
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154 os.close(rfd) |
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155 for i, item in func(*(staticargs + (pargs,))): |
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156 os.write(wfd, '%d %s\n' % (i, item)) |
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157 return 0 |
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158 |
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159 ret = scmutil.callcatch(ui, workerfunc) |
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160 except: # parent re-raises, child never returns |
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161 if os.getpid() == parentpid: |
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162 raise |
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163 exctype = sys.exc_info()[0] |
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164 force = not issubclass(exctype, KeyboardInterrupt) |
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165 ui.traceback(force=force) |
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166 finally: |
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167 if os.getpid() != parentpid: |
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168 try: |
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169 ui.flush() |
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170 except: # never returns, no re-raises |
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171 pass |
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172 finally: |
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173 os._exit(ret & 255) |
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175 os.close(wfd) |
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176 fp = os.fdopen(rfd, pycompat.sysstr('rb'), 0) |
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177 def cleanup(): |
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178 signal.signal(signal.SIGINT, oldhandler) |
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179 waitforworkers() |
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180 signal.signal(signal.SIGCHLD, oldchldhandler) |
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181 status = problem[0] |
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182 if status: |
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183 if status < 0: |
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184 os.kill(os.getpid(), -status) |
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185 sys.exit(status) |
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186 try: |
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188 l = line.split(' ', 1) |
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189 yield int(l[0]), l[1][:-1] |
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190 except: # re-raises |
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191 killworkers() |
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192 cleanup() |
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193 raise |
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194 cleanup() |
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195 |
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196 def _posixexitstatus(code): |
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197 '''convert a posix exit status into the same form returned by |
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198 os.spawnv |
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199 |
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200 returns None if the process was stopped instead of exiting''' |
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201 if os.WIFEXITED(code): |
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202 return os.WEXITSTATUS(code) |
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203 elif os.WIFSIGNALED(code): |
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204 return -os.WTERMSIG(code) |
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205 |
34645 | 206 if not pycompat.iswindows: |
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207 _platformworker = _posixworker |
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208 _exitstatus = _posixexitstatus |
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209 |
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210 def partition(lst, nslices): |
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211 '''partition a list into N slices of roughly equal size |
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212 |
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213 The current strategy takes every Nth element from the input. If |
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214 we ever write workers that need to preserve grouping in input |
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215 we should consider allowing callers to specify a partition strategy. |
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216 |
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217 mpm is not a fan of this partitioning strategy when files are involved. |
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218 In his words: |
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219 |
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220 Single-threaded Mercurial makes a point of creating and visiting |
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221 files in a fixed order (alphabetical). When creating files in order, |
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222 a typical filesystem is likely to allocate them on nearby regions on |
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223 disk. Thus, when revisiting in the same order, locality is maximized |
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224 and various forms of OS and disk-level caching and read-ahead get a |
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225 chance to work. |
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226 |
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227 This effect can be quite significant on spinning disks. I discovered it |
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228 circa Mercurial v0.4 when revlogs were named by hashes of filenames. |
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229 Tarring a repo and copying it to another disk effectively randomized |
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230 the revlog ordering on disk by sorting the revlogs by hash and suddenly |
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231 performance of my kernel checkout benchmark dropped by ~10x because the |
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232 "working set" of sectors visited no longer fit in the drive's cache and |
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233 the workload switched from streaming to random I/O. |
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234 |
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235 What we should really be doing is have workers read filenames from a |
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236 ordered queue. This preserves locality and also keeps any worker from |
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237 getting more than one file out of balance. |
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238 ''' |
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239 for i in range(nslices): |
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240 yield lst[i::nslices] |