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@@ -1,152 +1,165 b'' | |||||
1 | # worker.py - master-slave parallelism support |
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1 | # worker.py - master-slave parallelism support | |
2 | # |
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2 | # | |
3 | # Copyright 2013 Facebook, Inc. |
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3 | # Copyright 2013 Facebook, Inc. | |
4 | # |
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4 | # | |
5 | # This software may be used and distributed according to the terms of the |
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5 | # This software may be used and distributed according to the terms of the | |
6 | # GNU General Public License version 2 or any later version. |
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6 | # GNU General Public License version 2 or any later version. | |
7 |
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7 | |||
8 | from __future__ import absolute_import |
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8 | from __future__ import absolute_import | |
9 |
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9 | |||
10 | import errno |
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10 | import errno | |
11 | import multiprocessing |
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12 | import os |
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11 | import os | |
13 | import signal |
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12 | import signal | |
14 | import sys |
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13 | import sys | |
15 | import threading |
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14 | import threading | |
16 |
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15 | |||
17 | from .i18n import _ |
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16 | from .i18n import _ | |
18 | from . import util |
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17 | from . import util | |
19 |
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18 | |||
20 | def countcpus(): |
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19 | def countcpus(): | |
21 | '''try to count the number of CPUs on the system''' |
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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 | |||
22 | try: |
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23 | try: | |
23 | return multiprocessing.cpu_count() |
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24 | n = int(os.sysconf('SC_NPROCESSORS_ONLN')) | |
24 | except NotImplementedError: |
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25 | if n > 0: | |
25 |
return |
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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 | |||
26 |
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39 | |||
27 | def _numworkers(ui): |
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40 | def _numworkers(ui): | |
28 | s = ui.config('worker', 'numcpus') |
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41 | s = ui.config('worker', 'numcpus') | |
29 | if s: |
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42 | if s: | |
30 | try: |
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43 | try: | |
31 | n = int(s) |
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44 | n = int(s) | |
32 | if n >= 1: |
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45 | if n >= 1: | |
33 | return n |
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46 | return n | |
34 | except ValueError: |
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47 | except ValueError: | |
35 | raise util.Abort(_('number of cpus must be an integer')) |
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48 | raise util.Abort(_('number of cpus must be an integer')) | |
36 | return min(max(countcpus(), 4), 32) |
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49 | return min(max(countcpus(), 4), 32) | |
37 |
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50 | |||
38 | if os.name == 'posix': |
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51 | if os.name == 'posix': | |
39 | _startupcost = 0.01 |
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52 | _startupcost = 0.01 | |
40 | else: |
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53 | else: | |
41 | _startupcost = 1e30 |
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54 | _startupcost = 1e30 | |
42 |
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55 | |||
43 | def worthwhile(ui, costperop, nops): |
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56 | def worthwhile(ui, costperop, nops): | |
44 | '''try to determine whether the benefit of multiple processes can |
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57 | '''try to determine whether the benefit of multiple processes can | |
45 | outweigh the cost of starting them''' |
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58 | outweigh the cost of starting them''' | |
46 | linear = costperop * nops |
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59 | linear = costperop * nops | |
47 | workers = _numworkers(ui) |
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60 | workers = _numworkers(ui) | |
48 | benefit = linear - (_startupcost * workers + linear / workers) |
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61 | benefit = linear - (_startupcost * workers + linear / workers) | |
49 | return benefit >= 0.15 |
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62 | return benefit >= 0.15 | |
50 |
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63 | |||
51 | def worker(ui, costperarg, func, staticargs, args): |
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64 | def worker(ui, costperarg, func, staticargs, args): | |
52 | '''run a function, possibly in parallel in multiple worker |
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65 | '''run a function, possibly in parallel in multiple worker | |
53 | processes. |
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66 | processes. | |
54 |
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67 | |||
55 | returns a progress iterator |
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68 | returns a progress iterator | |
56 |
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69 | |||
57 | costperarg - cost of a single task |
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70 | costperarg - cost of a single task | |
58 |
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71 | |||
59 | func - function to run |
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72 | func - function to run | |
60 |
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73 | |||
61 | staticargs - arguments to pass to every invocation of the function |
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74 | staticargs - arguments to pass to every invocation of the function | |
62 |
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75 | |||
63 | args - arguments to split into chunks, to pass to individual |
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76 | args - arguments to split into chunks, to pass to individual | |
64 | workers |
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77 | workers | |
65 | ''' |
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78 | ''' | |
66 | if worthwhile(ui, costperarg, len(args)): |
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79 | if worthwhile(ui, costperarg, len(args)): | |
67 | return _platformworker(ui, func, staticargs, args) |
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80 | return _platformworker(ui, func, staticargs, args) | |
68 | return func(*staticargs + (args,)) |
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81 | return func(*staticargs + (args,)) | |
69 |
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82 | |||
70 | def _posixworker(ui, func, staticargs, args): |
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83 | def _posixworker(ui, func, staticargs, args): | |
71 | rfd, wfd = os.pipe() |
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84 | rfd, wfd = os.pipe() | |
72 | workers = _numworkers(ui) |
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85 | workers = _numworkers(ui) | |
73 | oldhandler = signal.getsignal(signal.SIGINT) |
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86 | oldhandler = signal.getsignal(signal.SIGINT) | |
74 | signal.signal(signal.SIGINT, signal.SIG_IGN) |
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87 | signal.signal(signal.SIGINT, signal.SIG_IGN) | |
75 | pids, problem = [], [0] |
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88 | pids, problem = [], [0] | |
76 | for pargs in partition(args, workers): |
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89 | for pargs in partition(args, workers): | |
77 | pid = os.fork() |
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90 | pid = os.fork() | |
78 | if pid == 0: |
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91 | if pid == 0: | |
79 | signal.signal(signal.SIGINT, oldhandler) |
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92 | signal.signal(signal.SIGINT, oldhandler) | |
80 | try: |
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93 | try: | |
81 | os.close(rfd) |
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94 | os.close(rfd) | |
82 | for i, item in func(*(staticargs + (pargs,))): |
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95 | for i, item in func(*(staticargs + (pargs,))): | |
83 | os.write(wfd, '%d %s\n' % (i, item)) |
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96 | os.write(wfd, '%d %s\n' % (i, item)) | |
84 | os._exit(0) |
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97 | os._exit(0) | |
85 | except KeyboardInterrupt: |
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98 | except KeyboardInterrupt: | |
86 | os._exit(255) |
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99 | os._exit(255) | |
87 | # other exceptions are allowed to propagate, we rely |
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100 | # other exceptions are allowed to propagate, we rely | |
88 | # on lock.py's pid checks to avoid release callbacks |
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101 | # on lock.py's pid checks to avoid release callbacks | |
89 | pids.append(pid) |
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102 | pids.append(pid) | |
90 | pids.reverse() |
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103 | pids.reverse() | |
91 | os.close(wfd) |
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104 | os.close(wfd) | |
92 | fp = os.fdopen(rfd, 'rb', 0) |
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105 | fp = os.fdopen(rfd, 'rb', 0) | |
93 | def killworkers(): |
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106 | def killworkers(): | |
94 | # if one worker bails, there's no good reason to wait for the rest |
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107 | # if one worker bails, there's no good reason to wait for the rest | |
95 | for p in pids: |
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108 | for p in pids: | |
96 | try: |
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109 | try: | |
97 | os.kill(p, signal.SIGTERM) |
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110 | os.kill(p, signal.SIGTERM) | |
98 | except OSError as err: |
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111 | except OSError as err: | |
99 | if err.errno != errno.ESRCH: |
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112 | if err.errno != errno.ESRCH: | |
100 | raise |
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113 | raise | |
101 | def waitforworkers(): |
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114 | def waitforworkers(): | |
102 | for _pid in pids: |
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115 | for _pid in pids: | |
103 | st = _exitstatus(os.wait()[1]) |
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116 | st = _exitstatus(os.wait()[1]) | |
104 | if st and not problem[0]: |
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117 | if st and not problem[0]: | |
105 | problem[0] = st |
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118 | problem[0] = st | |
106 | killworkers() |
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119 | killworkers() | |
107 | t = threading.Thread(target=waitforworkers) |
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120 | t = threading.Thread(target=waitforworkers) | |
108 | t.start() |
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121 | t.start() | |
109 | def cleanup(): |
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122 | def cleanup(): | |
110 | signal.signal(signal.SIGINT, oldhandler) |
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123 | signal.signal(signal.SIGINT, oldhandler) | |
111 | t.join() |
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124 | t.join() | |
112 | status = problem[0] |
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125 | status = problem[0] | |
113 | if status: |
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126 | if status: | |
114 | if status < 0: |
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127 | if status < 0: | |
115 | os.kill(os.getpid(), -status) |
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128 | os.kill(os.getpid(), -status) | |
116 | sys.exit(status) |
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129 | sys.exit(status) | |
117 | try: |
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130 | try: | |
118 | for line in fp: |
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131 | for line in fp: | |
119 | l = line.split(' ', 1) |
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132 | l = line.split(' ', 1) | |
120 | yield int(l[0]), l[1][:-1] |
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133 | yield int(l[0]), l[1][:-1] | |
121 | except: # re-raises |
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134 | except: # re-raises | |
122 | killworkers() |
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135 | killworkers() | |
123 | cleanup() |
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136 | cleanup() | |
124 | raise |
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137 | raise | |
125 | cleanup() |
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138 | cleanup() | |
126 |
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139 | |||
127 | def _posixexitstatus(code): |
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140 | def _posixexitstatus(code): | |
128 | '''convert a posix exit status into the same form returned by |
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141 | '''convert a posix exit status into the same form returned by | |
129 | os.spawnv |
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142 | os.spawnv | |
130 |
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143 | |||
131 | returns None if the process was stopped instead of exiting''' |
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144 | returns None if the process was stopped instead of exiting''' | |
132 | if os.WIFEXITED(code): |
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145 | if os.WIFEXITED(code): | |
133 | return os.WEXITSTATUS(code) |
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146 | return os.WEXITSTATUS(code) | |
134 | elif os.WIFSIGNALED(code): |
|
147 | elif os.WIFSIGNALED(code): | |
135 | return -os.WTERMSIG(code) |
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148 | return -os.WTERMSIG(code) | |
136 |
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149 | |||
137 | if os.name != 'nt': |
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150 | if os.name != 'nt': | |
138 | _platformworker = _posixworker |
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151 | _platformworker = _posixworker | |
139 | _exitstatus = _posixexitstatus |
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152 | _exitstatus = _posixexitstatus | |
140 |
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153 | |||
141 | def partition(lst, nslices): |
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154 | def partition(lst, nslices): | |
142 | '''partition a list into N slices of equal size''' |
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155 | '''partition a list into N slices of equal size''' | |
143 | n = len(lst) |
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156 | n = len(lst) | |
144 | chunk, slop = n / nslices, n % nslices |
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157 | chunk, slop = n / nslices, n % nslices | |
145 | end = 0 |
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158 | end = 0 | |
146 | for i in xrange(nslices): |
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159 | for i in xrange(nslices): | |
147 | start = end |
|
160 | start = end | |
148 | end = start + chunk |
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161 | end = start + chunk | |
149 | if slop: |
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162 | if slop: | |
150 | end += 1 |
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163 | end += 1 | |
151 | slop -= 1 |
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164 | slop -= 1 | |
152 | yield lst[start:end] |
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165 | yield lst[start:end] |
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