Mercurial > hg > orthanc-book

annotate Sphinx/source/plugins/python/multiprocessing-2.py @ 927:dfe96daba4f8

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
python in win installer
author Alain Mazy <am@osimis.io>
date Wed, 29 Mar 2023 11:54:58 +0200
parents 6e02cd89eb6a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
702
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
1 import math
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
2 import multiprocessing
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
3 import orthanc
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
4 import signal
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
5 import time
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
6
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
7 # CPU-intensive computation taking about 4 seconds
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
8 # (same code as above)
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
9 def SlowComputation():
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
10 start = time.time()
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
11 for i in range(1000):
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
12 for j in range(30000):
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
13 math.sqrt(float(j))
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
14 end = time.time()
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
15 duration = (end - start)
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
16 return 'computation done in %.03f seconds\n' % duration
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
17
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
18 # Ignore CTRL+C in the slave processes
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
19 def Initializer():
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
20 signal.signal(signal.SIGINT, signal.SIG_IGN)
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
21
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
22 # Create a pool of 4 slave Python interpreters
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
23 POOL = multiprocessing.Pool(4, initializer = Initializer)
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
24
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
25 def OnRest(output, uri, **request):
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
26 # Offload the call to "SlowComputation" onto one slave process.
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
27 # The GIL is unlocked until the slave sends its answer back.
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
28 answer = POOL.apply(SlowComputation)
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
29 output.AnswerBuffer(answer, 'text/plain')
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
30
6e02cd89eb6a moving python samples in separate files
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
31 orthanc.RegisterRestCallback('/computation', OnRest)