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from IPython.parallel import *
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client = Client()
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# this will only run on machines that can import numpy:
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@require('numpy')
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def norm(A):
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from numpy.linalg import norm
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return norm(A,2)
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def checkpid(pid):
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"""return the pid of the engine"""
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import os
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return os.getpid() == pid
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def checkhostname(host):
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import socket
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return socket.gethostname() == host
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def getpid():
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import os
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return os.getpid()
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pid0 = client[0].apply_sync(getpid)
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# this will depend on the pid being that of target 0:
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@depend(checkpid, pid0)
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def getpid2():
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import os
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return os.getpid()
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view = client.load_balanced_view()
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view.block=True
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# will run on anything:
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pids1 = [ view.apply(getpid) for i in range(len(client.ids)) ]
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print(pids1)
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# will only run on e0:
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pids2 = [ view.apply(getpid2) for i in range(len(client.ids)) ]
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print(pids2)
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print("now test some dependency behaviors")
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def wait(t):
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import time
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time.sleep(t)
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return t
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# fail after some time:
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def wait_and_fail(t):
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import time
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time.sleep(t)
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return 1/0
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successes = [ view.apply_async(wait, 1).msg_ids[0] for i in range(len(client.ids)) ]
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failures = [ view.apply_async(wait_and_fail, 1).msg_ids[0] for i in range(len(client.ids)) ]
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mixed = [failures[0],successes[0]]
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d1a = Dependency(mixed, all=False, failure=True) # yes
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d1b = Dependency(mixed, all=False) # yes
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d2a = Dependency(mixed, all=True, failure=True) # yes after / no follow
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d2b = Dependency(mixed, all=True) # no
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d3 = Dependency(failures, all=False) # no
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d4 = Dependency(failures, all=False, failure=True) # yes
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d5 = Dependency(failures, all=True, failure=True) # yes after / no follow
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d6 = Dependency(successes, all=True, failure=True) # yes after / no follow
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view.block = False
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flags = view.temp_flags
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with flags(after=d1a):
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r1a = view.apply(getpid)
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with flags(follow=d1b):
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r1b = view.apply(getpid)
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with flags(after=d2b, follow=d2a):
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r2a = view.apply(getpid)
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with flags(after=d2a, follow=d2b):
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r2b = view.apply(getpid)
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with flags(after=d3):
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r3 = view.apply(getpid)
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with flags(after=d4):
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r4a = view.apply(getpid)
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with flags(follow=d4):
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r4b = view.apply(getpid)
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with flags(after=d3, follow=d4):
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r4c = view.apply(getpid)
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with flags(after=d5):
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r5 = view.apply(getpid)
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with flags(follow=d5, after=d3):
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r5b = view.apply(getpid)
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with flags(follow=d6):
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r6 = view.apply(getpid)
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with flags(after=d6, follow=d2b):
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r6b = view.apply(getpid)
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def should_fail(f):
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try:
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f()
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except error.KernelError:
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pass
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else:
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print('should have raised')
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# raise Exception("should have raised")
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# print(r1a.msg_ids)
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r1a.get()
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# print(r1b.msg_ids)
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r1b.get()
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# print(r2a.msg_ids)
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should_fail(r2a.get)
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# print(r2b.msg_ids)
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should_fail(r2b.get)
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# print(r3.msg_ids)
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should_fail(r3.get)
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# print(r4a.msg_ids)
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r4a.get()
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# print(r4b.msg_ids)
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r4b.get()
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# print(r4c.msg_ids)
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should_fail(r4c.get)
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# print(r5.msg_ids)
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r5.get()
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# print(r5b.msg_ids)
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should_fail(r5b.get)
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# print(r6.msg_ids)
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should_fail(r6.get) # assuming > 1 engine
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# print(r6b.msg_ids)
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should_fail(r6b.get)
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print('done')
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