New submission from CALMET: Hello, I have to find the right order of a list, for example try = [0,1,2,3,4,5,6,7,8,9] try = [0,1,2,3,4,5,6,7,9,8] try = [0,1,2,3,4,5,6,8,7,9] and so on... in this example there are factorial(10) = 3,6 million possible order to test. The results with be all the list 'try' that match with the test.
To go faster - I use mutiproceesiing - I define rightorder = Queue() - I define a function test with a line rightorder.put(try) - I wait for all the processes are finished p.join() - Then I read all the results in the main programm rightorder.get() The problem is that on exactly the same example - the rightorder.put() found by the process are always good - but the rightorder.get() in the main programm can be different (randomly). I first believed that when 2 processes call the function rightorder.put(try) at the same time, the lists ares mixed together in the Queue(). But even when I force cpu_count() to 1 (mono process) I still have the problem. To solve the problem I converted the list try=[2,3,0,4,2,9,7,8,1,5] in a string try2="2304297815" and since now rightorder.put(try) and rightorder.get() always give the same results. So I suppose that in multiprocessing with a Queue() rightorder.put(try) works if try is a number or a string but doesn't works if try is a list. ---------- files: BisesAmouRmulti-debug.py messages: 228993 nosy: AlainCALMET priority: normal severity: normal status: open title: In Multiprocessing Queue() doesn't work with list : __.put(list) != __.get() type: behavior versions: Python 3.3 Added file: http://bugs.python.org/file36865/BisesAmouRmulti-debug.py _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue22600> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
