Mercurial > hg
annotate mercurial/worker.py @ 35997:24f05489377b
rebase: make "successors" a set in _computeobsoletenotrebased()
There's no apparent reason for this variable to be a list and this
avoids converting it to a set when needed.
author | Denis Laxalde <denis@laxalde.org> |
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date | Sat, 10 Feb 2018 19:33:19 +0100 |
parents | 44fd4cfc6c0a |
children | 5bc7ff103081 |
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 import threading |
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15 import time |
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16 |
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17 from .i18n import _ |
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19 encoding, |
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21 pycompat, |
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22 scmutil, |
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24 ) | |
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25 |
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26 def countcpus(): |
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27 '''try to count the number of CPUs on the system''' |
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28 |
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29 # posix |
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30 try: |
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31 n = int(os.sysconf(r'SC_NPROCESSORS_ONLN')) |
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32 if n > 0: |
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33 return n |
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34 except (AttributeError, ValueError): |
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35 pass |
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36 |
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37 # windows |
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38 try: |
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39 n = int(encoding.environ['NUMBER_OF_PROCESSORS']) |
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40 if n > 0: |
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41 return n |
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42 except (KeyError, ValueError): |
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43 pass |
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44 |
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45 return 1 |
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46 |
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47 def _numworkers(ui): |
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48 s = ui.config('worker', 'numcpus') |
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49 if s: |
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50 try: |
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51 n = int(s) |
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52 if n >= 1: |
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53 return n |
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54 except ValueError: |
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55 raise error.Abort(_('number of cpus must be an integer')) |
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56 return min(max(countcpus(), 4), 32) |
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57 |
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58 if pycompat.isposix or pycompat.iswindows: |
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59 _startupcost = 0.01 |
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60 else: |
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61 _startupcost = 1e30 |
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62 |
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63 def worthwhile(ui, costperop, nops): |
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64 '''try to determine whether the benefit of multiple processes can |
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65 outweigh the cost of starting them''' |
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66 linear = costperop * nops |
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67 workers = _numworkers(ui) |
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68 benefit = linear - (_startupcost * workers + linear / workers) |
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69 return benefit >= 0.15 |
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70 |
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71 def worker(ui, costperarg, func, staticargs, args): |
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72 '''run a function, possibly in parallel in multiple worker |
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73 processes. |
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74 |
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75 returns a progress iterator |
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76 |
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77 costperarg - cost of a single task |
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78 |
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79 func - function to run |
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80 |
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81 staticargs - arguments to pass to every invocation of the function |
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82 |
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83 args - arguments to split into chunks, to pass to individual |
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84 workers |
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85 ''' |
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86 enabled = ui.configbool('worker', 'enabled') |
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87 if enabled and worthwhile(ui, costperarg, len(args)): |
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88 return _platformworker(ui, func, staticargs, args) |
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89 return func(*staticargs + (args,)) |
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90 |
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91 def _posixworker(ui, func, staticargs, args): |
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92 rfd, wfd = os.pipe() |
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93 workers = _numworkers(ui) |
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94 oldhandler = signal.getsignal(signal.SIGINT) |
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95 signal.signal(signal.SIGINT, signal.SIG_IGN) |
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97 def killworkers(): |
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98 # unregister SIGCHLD handler as all children will be killed. This |
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99 # function shouldn't be interrupted by another SIGCHLD; otherwise pids |
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100 # could be updated while iterating, which would cause inconsistency. |
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101 signal.signal(signal.SIGCHLD, oldchldhandler) |
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102 # if one worker bails, there's no good reason to wait for the rest |
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103 for p in pids: |
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104 try: |
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105 os.kill(p, signal.SIGTERM) |
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106 except OSError as err: |
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107 if err.errno != errno.ESRCH: |
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108 raise |
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109 def waitforworkers(blocking=True): |
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110 for pid in pids.copy(): |
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111 p = st = 0 |
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112 while True: |
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113 try: |
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114 p, st = os.waitpid(pid, (0 if blocking else os.WNOHANG)) |
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115 break |
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116 except OSError as e: |
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117 if e.errno == errno.EINTR: |
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118 continue |
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119 elif e.errno == errno.ECHILD: |
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120 # child would already be reaped, but pids yet been |
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121 # updated (maybe interrupted just after waitpid) |
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122 pids.discard(pid) |
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123 break |
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124 else: |
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125 raise |
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126 if not p: |
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127 # skip subsequent steps, because child process should |
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128 # be still running in this case |
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129 continue |
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130 pids.discard(p) |
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131 st = _exitstatus(st) |
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132 if st and not problem[0]: |
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133 problem[0] = st |
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134 def sigchldhandler(signum, frame): |
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135 waitforworkers(blocking=False) |
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136 if problem[0]: |
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137 killworkers() |
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138 oldchldhandler = signal.signal(signal.SIGCHLD, sigchldhandler) |
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139 ui.flush() |
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140 parentpid = os.getpid() |
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141 for pargs in partition(args, workers): |
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142 # make sure we use os._exit in all worker code paths. otherwise the |
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143 # worker may do some clean-ups which could cause surprises like |
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144 # deadlock. see sshpeer.cleanup for example. |
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145 # override error handling *before* fork. this is necessary because |
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146 # exception (signal) may arrive after fork, before "pid =" assignment |
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147 # completes, and other exception handler (dispatch.py) can lead to |
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148 # unexpected code path without os._exit. |
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149 ret = -1 |
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150 try: |
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151 pid = os.fork() |
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152 if pid == 0: |
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153 signal.signal(signal.SIGINT, oldhandler) |
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154 signal.signal(signal.SIGCHLD, oldchldhandler) |
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155 |
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156 def workerfunc(): |
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157 os.close(rfd) |
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158 for i, item in func(*(staticargs + (pargs,))): |
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159 os.write(wfd, '%d %s\n' % (i, item)) |
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160 return 0 |
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161 |
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162 ret = scmutil.callcatch(ui, workerfunc) |
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163 except: # parent re-raises, child never returns |
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164 if os.getpid() == parentpid: |
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165 raise |
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166 exctype = sys.exc_info()[0] |
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167 force = not issubclass(exctype, KeyboardInterrupt) |
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168 ui.traceback(force=force) |
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169 finally: |
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170 if os.getpid() != parentpid: |
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171 try: |
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172 ui.flush() |
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173 except: # never returns, no re-raises |
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174 pass |
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175 finally: |
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176 os._exit(ret & 255) |
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178 os.close(wfd) |
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179 fp = os.fdopen(rfd, pycompat.sysstr('rb'), 0) |
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180 def cleanup(): |
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181 signal.signal(signal.SIGINT, oldhandler) |
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182 waitforworkers() |
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183 signal.signal(signal.SIGCHLD, oldchldhandler) |
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184 status = problem[0] |
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185 if status: |
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186 if status < 0: |
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187 os.kill(os.getpid(), -status) |
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188 sys.exit(status) |
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189 try: |
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191 l = line.split(' ', 1) |
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192 yield int(l[0]), l[1][:-1] |
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193 except: # re-raises |
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194 killworkers() |
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195 cleanup() |
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196 raise |
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197 cleanup() |
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198 |
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199 def _posixexitstatus(code): |
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200 '''convert a posix exit status into the same form returned by |
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201 os.spawnv |
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202 |
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203 returns None if the process was stopped instead of exiting''' |
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204 if os.WIFEXITED(code): |
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205 return os.WEXITSTATUS(code) |
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206 elif os.WIFSIGNALED(code): |
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207 return -os.WTERMSIG(code) |
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208 |
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209 def _windowsworker(ui, func, staticargs, args): |
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210 class Worker(threading.Thread): |
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211 def __init__(self, taskqueue, resultqueue, func, staticargs, |
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212 group=None, target=None, name=None, verbose=None): |
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213 threading.Thread.__init__(self, group=group, target=target, |
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214 name=name, verbose=verbose) |
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215 self._taskqueue = taskqueue |
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216 self._resultqueue = resultqueue |
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217 self._func = func |
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218 self._staticargs = staticargs |
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219 self._interrupted = False |
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220 self.daemon = True |
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221 self.exception = None |
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222 |
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223 def interrupt(self): |
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224 self._interrupted = True |
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225 |
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226 def run(self): |
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227 try: |
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228 while not self._taskqueue.empty(): |
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229 try: |
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230 args = self._taskqueue.get_nowait() |
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231 for res in self._func(*self._staticargs + (args,)): |
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232 self._resultqueue.put(res) |
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233 # threading doesn't provide a native way to |
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234 # interrupt execution. handle it manually at every |
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235 # iteration. |
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236 if self._interrupted: |
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237 return |
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238 except util.empty: |
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239 break |
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240 except Exception as e: |
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241 # store the exception such that the main thread can resurface |
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242 # it as if the func was running without workers. |
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243 self.exception = e |
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244 raise |
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245 |
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246 threads = [] |
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247 def trykillworkers(): |
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248 # Allow up to 1 second to clean worker threads nicely |
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249 cleanupend = time.time() + 1 |
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250 for t in threads: |
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251 t.interrupt() |
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252 for t in threads: |
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253 remainingtime = cleanupend - time.time() |
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254 t.join(remainingtime) |
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255 if t.is_alive(): |
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256 # pass over the workers joining failure. it is more |
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257 # important to surface the inital exception than the |
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258 # fact that one of workers may be processing a large |
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259 # task and does not get to handle the interruption. |
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260 ui.warn(_("failed to kill worker threads while " |
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261 "handling an exception\n")) |
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262 return |
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263 |
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264 workers = _numworkers(ui) |
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265 resultqueue = util.queue() |
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266 taskqueue = util.queue() |
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267 # partition work to more pieces than workers to minimize the chance |
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268 # of uneven distribution of large tasks between the workers |
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269 for pargs in partition(args, workers * 20): |
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270 taskqueue.put(pargs) |
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271 for _i in range(workers): |
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272 t = Worker(taskqueue, resultqueue, func, staticargs) |
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273 threads.append(t) |
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274 t.start() |
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275 try: |
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276 while len(threads) > 0: |
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277 while not resultqueue.empty(): |
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278 yield resultqueue.get() |
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279 threads[0].join(0.05) |
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280 finishedthreads = [_t for _t in threads if not _t.is_alive()] |
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281 for t in finishedthreads: |
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282 if t.exception is not None: |
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283 raise t.exception |
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284 threads.remove(t) |
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285 except (Exception, KeyboardInterrupt): # re-raises |
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286 trykillworkers() |
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287 raise |
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288 while not resultqueue.empty(): |
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289 yield resultqueue.get() |
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290 |
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291 if pycompat.iswindows: |
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292 _platformworker = _windowsworker |
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293 else: |
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294 _platformworker = _posixworker |
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295 _exitstatus = _posixexitstatus |
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296 |
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297 def partition(lst, nslices): |
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298 '''partition a list into N slices of roughly equal size |
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299 |
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300 The current strategy takes every Nth element from the input. If |
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301 we ever write workers that need to preserve grouping in input |
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302 we should consider allowing callers to specify a partition strategy. |
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303 |
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304 mpm is not a fan of this partitioning strategy when files are involved. |
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305 In his words: |
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306 |
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307 Single-threaded Mercurial makes a point of creating and visiting |
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308 files in a fixed order (alphabetical). When creating files in order, |
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309 a typical filesystem is likely to allocate them on nearby regions on |
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310 disk. Thus, when revisiting in the same order, locality is maximized |
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311 and various forms of OS and disk-level caching and read-ahead get a |
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312 chance to work. |
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313 |
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314 This effect can be quite significant on spinning disks. I discovered it |
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315 circa Mercurial v0.4 when revlogs were named by hashes of filenames. |
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316 Tarring a repo and copying it to another disk effectively randomized |
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317 the revlog ordering on disk by sorting the revlogs by hash and suddenly |
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318 performance of my kernel checkout benchmark dropped by ~10x because the |
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319 "working set" of sectors visited no longer fit in the drive's cache and |
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320 the workload switched from streaming to random I/O. |
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321 |
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322 What we should really be doing is have workers read filenames from a |
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323 ordered queue. This preserves locality and also keeps any worker from |
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324 getting more than one file out of balance. |
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325 ''' |
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326 for i in range(nslices): |
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327 yield lst[i::nslices] |