Mercurial > hg
annotate mercurial/worker.py @ 26878:d7e83f106459
encoding: use getutf8char in toutf8b
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input and similar confusion by working a character at a time.
author | Matt Mackall <mpm@selenic.com> |
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date | Thu, 05 Nov 2015 17:21:43 -0600 |
parents | 56b2bcea2529 |
children | f8efc8a3a991 |
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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 |
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16 from .i18n import _ |
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17 from . import error |
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18 |
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19 def countcpus(): |
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20 '''try to count the number of CPUs on the system''' |
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21 |
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22 # posix |
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23 try: |
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24 n = int(os.sysconf('SC_NPROCESSORS_ONLN')) |
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25 if n > 0: |
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26 return n |
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27 except (AttributeError, ValueError): |
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28 pass |
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29 |
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30 # windows |
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31 try: |
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32 n = int(os.environ['NUMBER_OF_PROCESSORS']) |
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33 if n > 0: |
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34 return n |
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35 except (KeyError, ValueError): |
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36 pass |
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37 |
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38 return 1 |
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39 |
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40 def _numworkers(ui): |
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41 s = ui.config('worker', 'numcpus') |
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42 if s: |
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43 try: |
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44 n = int(s) |
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45 if n >= 1: |
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46 return n |
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47 except ValueError: |
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48 raise error.Abort(_('number of cpus must be an integer')) |
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49 return min(max(countcpus(), 4), 32) |
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50 |
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51 if os.name == 'posix': |
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52 _startupcost = 0.01 |
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53 else: |
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54 _startupcost = 1e30 |
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55 |
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56 def worthwhile(ui, costperop, nops): |
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57 '''try to determine whether the benefit of multiple processes can |
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58 outweigh the cost of starting them''' |
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59 linear = costperop * nops |
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60 workers = _numworkers(ui) |
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61 benefit = linear - (_startupcost * workers + linear / workers) |
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62 return benefit >= 0.15 |
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63 |
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64 def worker(ui, costperarg, func, staticargs, args): |
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65 '''run a function, possibly in parallel in multiple worker |
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66 processes. |
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67 |
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68 returns a progress iterator |
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69 |
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70 costperarg - cost of a single task |
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71 |
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72 func - function to run |
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73 |
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74 staticargs - arguments to pass to every invocation of the function |
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75 |
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76 args - arguments to split into chunks, to pass to individual |
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77 workers |
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78 ''' |
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79 if worthwhile(ui, costperarg, len(args)): |
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80 return _platformworker(ui, func, staticargs, args) |
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81 return func(*staticargs + (args,)) |
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82 |
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83 def _posixworker(ui, func, staticargs, args): |
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84 rfd, wfd = os.pipe() |
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85 workers = _numworkers(ui) |
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86 oldhandler = signal.getsignal(signal.SIGINT) |
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87 signal.signal(signal.SIGINT, signal.SIG_IGN) |
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88 pids, problem = [], [0] |
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89 for pargs in partition(args, workers): |
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90 pid = os.fork() |
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91 if pid == 0: |
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92 signal.signal(signal.SIGINT, oldhandler) |
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93 try: |
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94 os.close(rfd) |
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95 for i, item in func(*(staticargs + (pargs,))): |
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96 os.write(wfd, '%d %s\n' % (i, item)) |
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97 os._exit(0) |
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98 except KeyboardInterrupt: |
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99 os._exit(255) |
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100 # other exceptions are allowed to propagate, we rely |
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101 # on lock.py's pid checks to avoid release callbacks |
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102 pids.append(pid) |
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103 pids.reverse() |
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104 os.close(wfd) |
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105 fp = os.fdopen(rfd, 'rb', 0) |
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106 def killworkers(): |
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107 # if one worker bails, there's no good reason to wait for the rest |
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108 for p in pids: |
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109 try: |
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110 os.kill(p, signal.SIGTERM) |
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111 except OSError as err: |
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112 if err.errno != errno.ESRCH: |
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113 raise |
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114 def waitforworkers(): |
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115 for _pid in pids: |
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116 st = _exitstatus(os.wait()[1]) |
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117 if st and not problem[0]: |
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118 problem[0] = st |
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119 killworkers() |
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120 t = threading.Thread(target=waitforworkers) |
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121 t.start() |
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122 def cleanup(): |
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123 signal.signal(signal.SIGINT, oldhandler) |
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124 t.join() |
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125 status = problem[0] |
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126 if status: |
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127 if status < 0: |
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128 os.kill(os.getpid(), -status) |
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129 sys.exit(status) |
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130 try: |
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131 for line in fp: |
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132 l = line.split(' ', 1) |
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133 yield int(l[0]), l[1][:-1] |
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134 except: # re-raises |
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135 killworkers() |
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136 cleanup() |
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137 raise |
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138 cleanup() |
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139 |
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140 def _posixexitstatus(code): |
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141 '''convert a posix exit status into the same form returned by |
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142 os.spawnv |
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143 |
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144 returns None if the process was stopped instead of exiting''' |
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145 if os.WIFEXITED(code): |
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146 return os.WEXITSTATUS(code) |
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147 elif os.WIFSIGNALED(code): |
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148 return -os.WTERMSIG(code) |
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149 |
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150 if os.name != 'nt': |
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151 _platformworker = _posixworker |
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152 _exitstatus = _posixexitstatus |
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153 |
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154 def partition(lst, nslices): |
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155 '''partition a list into N slices of equal size''' |
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156 n = len(lst) |
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157 chunk, slop = n / nslices, n % nslices |
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158 end = 0 |
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159 for i in xrange(nslices): |
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160 start = end |
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161 end = start + chunk |
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162 if slop: |
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163 end += 1 |
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164 slop -= 1 |
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165 yield lst[start:end] |