1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
"""Run a group of subprocesses and then finish."""
import multiprocessing
import random
import subprocess
import sys
import tempfile
import time
_DEFAULT_MAX_JOBS = 16 * multiprocessing.cpu_count()
def shuffle_iteratable(it):
"""Return an iterable that randomly walks it"""
# take a random sampling from the passed in iterable
# we take an element with probablity 1/p and rapidly increase
# p as we take elements - this gives us a somewhat random set of values before
# we've seen all the values, but starts producing values without having to
# compute ALL of them at once, allowing tests to start a little earlier
nextit = []
p = 1
for val in it:
if random.randint(0, p) == 0:
p = min(p*2, 100)
yield val
else:
nextit.append(val)
# after taking a random sampling, we shuffle the rest of the elements and
# yield them
random.shuffle(nextit)
for val in nextit:
yield val
_SUCCESS = object()
_FAILURE = object()
_RUNNING = object()
_KILLED = object()
_COLORS = {
'red': 31,
'green': 32,
'yellow': 33,
}
_BEGINNING_OF_LINE = '\x1b[0G'
_CLEAR_LINE = '\x1b[2K'
_TAG_COLOR = {
'FAILED': 'red',
'PASSED': 'green',
'START': 'yellow',
'WAITING': 'yellow',
}
def message(tag, message, explanatory_text=None):
sys.stdout.write('%s%s\x1b[%dm%s\x1b[0m: %s%s' % (
_BEGINNING_OF_LINE,
_CLEAR_LINE,
_COLORS[_TAG_COLOR[tag]],
tag,
message,
'\n%s\n' % explanatory_text if explanatory_text is not None else ''))
sys.stdout.flush()
class Job(object):
"""Manages one job."""
def __init__(self, cmdline):
self._cmdline = ' '.join(cmdline)
self._tempfile = tempfile.TemporaryFile()
self._process = subprocess.Popen(args=cmdline,
stderr=subprocess.STDOUT,
stdout=self._tempfile)
self._state = _RUNNING
message('START', self._cmdline)
def state(self):
"""Poll current state of the job. Prints messages at completion."""
if self._state == _RUNNING and self._process.poll() is not None:
if self._process.returncode != 0:
self._state = _FAILURE
self._tempfile.seek(0)
stdout = self._tempfile.read()
message('FAILED', '%s [ret=%d]' % (self._cmdline, self._process.returncode), stdout)
else:
self._state = _SUCCESS
message('PASSED', '%s' % self._cmdline)
return self._state
def kill(self):
if self._state == _RUNNING:
self._state = _KILLED
self._process.terminate()
class Jobset(object):
"""Manages one run of jobs."""
def __init__(self, check_cancelled, maxjobs):
self._running = set()
self._check_cancelled = check_cancelled
self._cancelled = False
self._failures = 0
self._completed = 0
self._maxjobs = maxjobs
def start(self, cmdline):
"""Start a job. Return True on success, False on failure."""
while len(self._running) >= self._maxjobs:
if self.cancelled(): return False
self.reap()
if self.cancelled(): return False
self._running.add(Job(cmdline))
return True
def reap(self):
"""Collect the dead jobs."""
while self._running:
dead = set()
for job in self._running:
st = job.state()
if st == _RUNNING: continue
if st == _FAILURE: self._failures += 1
dead.add(job)
for job in dead:
self._completed += 1
self._running.remove(job)
if dead: return
message('WAITING', '%d jobs running, %d complete' % (
len(self._running), self._completed))
time.sleep(0.1)
def cancelled(self):
"""Poll for cancellation."""
if self._cancelled: return True
if not self._check_cancelled(): return False
for job in self._running:
job.kill()
self._cancelled = True
return True
def finish(self):
while self._running:
if self.cancelled(): pass # poll cancellation
self.reap()
return not self.cancelled() and self._failures == 0
def _never_cancelled():
return False
def run(cmdlines, check_cancelled=_never_cancelled, maxjobs=None):
js = Jobset(check_cancelled,
maxjobs if maxjobs is not None else _DEFAULT_MAX_JOBS)
for cmdline in shuffle_iteratable(cmdlines):
if not js.start(cmdline):
break
return js.finish()
|
