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comparison Sphinx/source/plugins/python/multiprocessing-2.py @ 702:6e02cd89eb6a

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moving python samples in separate files
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 11 Jun 2021 09:38:15 +0200
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701:f093160dd7f4 702:6e02cd89eb6a
1 import math
2 import multiprocessing
3 import orthanc
4 import signal
5 import time
6
7 # CPU-intensive computation taking about 4 seconds
8 # (same code as above)
9 def SlowComputation():
10 start = time.time()
11 for i in range(1000):
12 for j in range(30000):
13 math.sqrt(float(j))
14 end = time.time()
15 duration = (end - start)
16 return 'computation done in %.03f seconds\n' % duration
17
18 # Ignore CTRL+C in the slave processes
19 def Initializer():
20 signal.signal(signal.SIGINT, signal.SIG_IGN)
21
22 # Create a pool of 4 slave Python interpreters
23 POOL = multiprocessing.Pool(4, initializer = Initializer)
24
25 def OnRest(output, uri, **request):
26 # Offload the call to "SlowComputation" onto one slave process.
27 # The GIL is unlocked until the slave sends its answer back.
28 answer = POOL.apply(SlowComputation)
29 output.AnswerBuffer(answer, 'text/plain')
30
31 orthanc.RegisterRestCallback('/computation', OnRest)