Mercurial > hg
annotate mercurial/worker.py @ 21803:62cc4055c6c8
hg: use vfs functions in clone
This change applies vfs functions in clone. destvfs.exists will invoke
os.path.lexists via lexists of vfs to check for broken symbolic links.
author | Chinmay Joshi <c@chinmayjoshi.com> |
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date | Sat, 21 Jun 2014 14:44:09 +0530 |
parents | 1e5b38a919dd |
children | b3e51675f98e |
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 i18n import _ |
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9 import errno, os, signal, sys, threading |
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10 import util |
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11 |
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12 def countcpus(): |
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13 '''try to count the number of CPUs on the system''' |
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14 |
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15 # posix |
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16 try: |
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17 n = int(os.sysconf('SC_NPROCESSORS_ONLN')) |
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18 if n > 0: |
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19 return n |
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20 except (AttributeError, ValueError): |
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21 pass |
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22 |
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23 # windows |
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24 try: |
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25 n = int(os.environ['NUMBER_OF_PROCESSORS']) |
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26 if n > 0: |
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27 return n |
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28 except (KeyError, ValueError): |
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29 pass |
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30 |
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31 return 1 |
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32 |
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33 def _numworkers(ui): |
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34 s = ui.config('worker', 'numcpus') |
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35 if s: |
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36 try: |
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37 n = int(s) |
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38 if n >= 1: |
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39 return n |
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40 except ValueError: |
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41 raise util.Abort(_('number of cpus must be an integer')) |
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42 return min(max(countcpus(), 4), 32) |
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43 |
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44 if os.name == 'posix': |
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45 _startupcost = 0.01 |
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46 else: |
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47 _startupcost = 1e30 |
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48 |
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49 def worthwhile(ui, costperop, nops): |
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50 '''try to determine whether the benefit of multiple processes can |
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51 outweigh the cost of starting them''' |
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52 linear = costperop * nops |
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53 workers = _numworkers(ui) |
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54 benefit = linear - (_startupcost * workers + linear / workers) |
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55 return benefit >= 0.15 |
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56 |
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57 def worker(ui, costperarg, func, staticargs, args): |
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58 '''run a function, possibly in parallel in multiple worker |
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59 processes. |
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60 |
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61 returns a progress iterator |
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62 |
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63 costperarg - cost of a single task |
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64 |
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65 func - function to run |
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66 |
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67 staticargs - arguments to pass to every invocation of the function |
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68 |
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69 args - arguments to split into chunks, to pass to individual |
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70 workers |
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71 ''' |
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72 if worthwhile(ui, costperarg, len(args)): |
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73 return _platformworker(ui, func, staticargs, args) |
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74 return func(*staticargs + (args,)) |
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75 |
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76 def _posixworker(ui, func, staticargs, args): |
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77 rfd, wfd = os.pipe() |
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78 workers = _numworkers(ui) |
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79 oldhandler = signal.getsignal(signal.SIGINT) |
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80 signal.signal(signal.SIGINT, signal.SIG_IGN) |
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81 pids, problem = [], [0] |
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82 for pargs in partition(args, workers): |
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83 pid = os.fork() |
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84 if pid == 0: |
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85 signal.signal(signal.SIGINT, oldhandler) |
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86 try: |
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87 os.close(rfd) |
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88 for i, item in func(*(staticargs + (pargs,))): |
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89 os.write(wfd, '%d %s\n' % (i, item)) |
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90 os._exit(0) |
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91 except KeyboardInterrupt: |
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92 os._exit(255) |
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93 # other exceptions are allowed to propagate, we rely |
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94 # on lock.py's pid checks to avoid release callbacks |
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95 pids.append(pid) |
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96 pids.reverse() |
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97 os.close(wfd) |
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98 fp = os.fdopen(rfd, 'rb', 0) |
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99 def killworkers(): |
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100 # if one worker bails, there's no good reason to wait for the rest |
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101 for p in pids: |
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102 try: |
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103 os.kill(p, signal.SIGTERM) |
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104 except OSError, err: |
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105 if err.errno != errno.ESRCH: |
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106 raise |
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107 def waitforworkers(): |
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108 for _ in pids: |
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109 st = _exitstatus(os.wait()[1]) |
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110 if st and not problem[0]: |
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111 problem[0] = st |
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112 killworkers() |
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113 t = threading.Thread(target=waitforworkers) |
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114 t.start() |
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115 def cleanup(): |
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116 signal.signal(signal.SIGINT, oldhandler) |
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117 t.join() |
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118 status = problem[0] |
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119 if status: |
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120 if status < 0: |
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121 os.kill(os.getpid(), -status) |
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122 sys.exit(status) |
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123 try: |
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124 for line in fp: |
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125 l = line.split(' ', 1) |
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126 yield int(l[0]), l[1][:-1] |
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127 except: # re-raises |
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128 killworkers() |
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129 cleanup() |
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130 raise |
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131 cleanup() |
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132 |
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133 def _posixexitstatus(code): |
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134 '''convert a posix exit status into the same form returned by |
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135 os.spawnv |
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136 |
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137 returns None if the process was stopped instead of exiting''' |
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138 if os.WIFEXITED(code): |
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139 return os.WEXITSTATUS(code) |
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140 elif os.WIFSIGNALED(code): |
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141 return -os.WTERMSIG(code) |
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142 |
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143 if os.name != 'nt': |
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144 _platformworker = _posixworker |
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145 _exitstatus = _posixexitstatus |
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146 |
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147 def partition(lst, nslices): |
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148 '''partition a list into N slices of equal size''' |
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149 n = len(lst) |
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150 chunk, slop = n / nslices, n % nslices |
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151 end = 0 |
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152 for i in xrange(nslices): |
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153 start = end |
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154 end = start + chunk |
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155 if slop: |
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156 end += 1 |
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157 slop -= 1 |
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158 yield lst[start:end] |