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| From | Mark Lawrence <breamoreboy@yahoo.co.uk> |
| Subject | Re: Code with random module faster on the vm than the vm host... |
| Date | Mon, 11 Nov 2013 01:31:46 +0000 |
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On 11/11/2013 01:15, Ned Batchelder wrote: > On Friday, November 8, 2013 12:48:04 PM UTC-5, Pascal Bit wrote: >> Here's the code: >> >> from random import random >> from time import clock >> >> s = clock() >> >> for i in (1, 2, 3, 6, 8): >> M = 0 >> N = 10**i >> >> for n in xrange(N): >> r = random() >> if 0.5 < r < 0.6: >> M += 1 >> >> k = (N, float(M)/N) >> >> print (clock()-s) >> >> Running on win7 python 2.7 32 bit it uses around 30 seconds avg. >> Running on xubuntu, 32 bit, on vmware on windows 7: 20 seconds! >> The code runs faster on vm, than the computer itself... >> The python version in this case is 1.5 times faster... >> I don't understand. >> >> What causes this? > > The docs for time.clock() make clear that the meaning on Windows and Unix are different: > > "On Unix, return the current processor time as a floating point number expressed in seconds." > > "On Windows, this function returns wall-clock seconds elapsed since the first call to this function..." > > Try the experiment again with time.time() instead. > > --Ned. > http://www.python.org/dev/peps/pep-0418/ for some related reading about Python time functions. -- Python is the second best programming language in the world. But the best has yet to be invented. Christian Tismer Mark Lawrence
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Code with random module faster on the vm than the vm host... Pascal Bit <pascalbit@hotmail.com> - 2013-11-08 18:48 +0100
Re: Code with random module faster on the vm than the vm host... alex23 <wuwei23@gmail.com> - 2013-11-11 10:49 +1000
Re: Code with random module faster on the vm than the vm host... Robert Kern <robert.kern@gmail.com> - 2013-11-11 01:19 +0000
Re: Code with random module faster on the vm than the vm host... alex23 <wuwei23@gmail.com> - 2013-11-11 12:16 +1000
Re: Code with random module faster on the vm than the vm host... Ned Batchelder <ned@nedbatchelder.com> - 2013-11-10 17:15 -0800
Re: Code with random module faster on the vm than the vm host... Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-11 01:31 +0000
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