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multiprocessing blues in Windows7 12 Years Ago by TrustyTony This example program of using the multiprocessing is crashing my i7 4 core windows7 64 bit computer … utf-8 -*- from numpy import arange,sqrt, random, linalg from multiprocessing import Pool global counter counter = 0 def cb(r): global…counter http://pyinsci.blogspot.fi/2009/02/usage-pattern-for-multiprocessing.html Multiprocessing causes BSOD 12 Years Ago by delta_frost … anyone please point out what is wrong with it ? import multiprocessing def cracker(): print "Hello" return procs = [] for… i in range(8): p = multiprocessing.Process(target = cracker) procs.append(p) p.start() for p… Re: Multiprocessing causes BSOD 12 Years Ago by TrustyTony …code is not protected for importing, which multiprocessing module uses, this works: import multiprocessing def cracker(): print "Hello"… '__main__': procs = [] for i in range(8): p = multiprocessing.Process(target = cracker) procs.append(p) p.start() for p… Re: multiprocessing blues in Windows7 12 Years Ago by TrustyTony …: utf-8 -*- from numpy import arange,sqrt, random, linalg from multiprocessing import Pool global counter counter = 0 def cb(r): global… Multiprocessing for an HPC 10 Years Ago by fatalaccidents … sqlite DB and my first idea was to implement the multiprocessing Pool function. I'm not sure if this question would… this to run. Do I need to implement mpi4py and multiprocessing in some way? I'm severely confused. Sorry for not… Running multiprocessing inside decorator 13 Years Ago by falek.marcin …When I'm calling the method **run_in_parallels** using multiprocessing I 'm getting the error: `Can't pickle…which will end operation stops the others. from multiprocessing import Process,Event class ExtProcess(Process): def __init__… and the simpliest way is to use multiprocessing inside decorator. But unfortunatly I can't… Re: Running multiprocessing inside decorator 13 Years Ago by falek.marcin … in run_in_parallel process.start() File "C:\Interpreters\Python32\lib\multiprocessing\process.py", line 130, in start self._popen = …dump(process_obj, to_child, HIGHEST_PROTOCOL) File "C:\Interpreters\Python32\lib\multiprocessing\forking.py", line 190, in dump ForkingPickler(file, protocol… Python multiprocessing: How to reload processes when a config is modified 10 Years Ago by 4m1nh4j1 I am using python multiprocessing lib and I would like to reload a list of …def dispatch_processs(self, conf): processs = [] event = multiprocessing.Event() for conf in self.get_config(): process = multiprocessing.Process(target=self.sched,args=( i for… Re: Python multiprocessing: How to reload processes when a config is modified 10 Years Ago by woooee … Doug Hellmann's site [Click Here](http://pymotw.com/2/multiprocessing/communication.html) This simple example shows that changes made to… of the process can be seen by all processes from multiprocessing import Process, Manager def test_f(test_d): """ frist… Threading , Multiprocessing Simple program 13 Years Ago by Creatinas Hello again, Can someone please help me learn some easy multiprocessing or threading :) I want to write a simple program that … some HTML from those sites. What is better to use multiprocessing of threading? What different ? How it works? I really want… Re: Threading , Multiprocessing Simple program 13 Years Ago by Gribouillis Perhaps you could start by reading Doug Hellmann's python module of the week on the threading and multiprocessing modules: [url]http://www.doughellmann.com/PyMOTW/threading/index.html[/url] and [url]http://www.doughellmann.com/PyMOTW/multiprocessing/basics.html[/url] . Re: Python subprocess return code without waiting with multiprocessing 10 Years Ago by woooee … use is_alive() to check the status of a process in multiprocessing. You could also use a manager.dict() set to True…. Also take a look at pool from multiprocessing [Click Here](http://pymotw.com/2/multiprocessing/communication.html#process-pools) as I am… Re: Python subprocess return code without waiting with multiprocessing 10 Years Ago by Gribouillis … me #!/usr/bin/env python # -*-coding: utf8-*- # ./main.py from multiprocessing import Process, Queue from subprocess import Popen, PIPE def runJob… chance import Queue from Queue instead of importing it from multiprocessing ? This would block. Your argument with `communicate()` does not hold… Threading Or Multiprocessing??? 14 Years Ago by twohot … that there are different ways to approach his, Threading and Multiprocessing being the most popular. I am wondering which will best… Re: Threading Or Multiprocessing??? 14 Years Ago by richieking I dont know about Multiprocessing but i know that threading+socket will do this job without any issues at all. ;) Re: Threading Or Multiprocessing??? 14 Years Ago by woooee The advantages of Multiprocessing are: it does not use a GIL and it can use multiple cores if you are on a multi-core machine. This means that it is usually faster, but it ultimately comes down to what you understand and can use. Python subprocess return code without waiting with multiprocessing 10 Years Ago by fatalaccidents … I've read. I'm wanting to use subprocess and multiprocessing to spawn a bunch of jobs serially and return the… Re: Python subprocess return code without waiting with multiprocessing 10 Years Ago by fatalaccidents … output for a logfile. Also, I'm trying to use multiprocessing to spawn this across multiple processors. That's why I… Re: Python subprocess return code without waiting with multiprocessing 10 Years Ago by fatalaccidents … processors. #!/usr/bin/env python # -*-coding: utf8-*- # ./main.py from multiprocessing import Process, Queue from subprocess import Popen, PIPE def runJob… Re: multiprocessing blues in Windows7 12 Years Ago by vegaseat Thanks for letting us know! Re: Multiprocessing causes BSOD 12 Years Ago by Gribouillis Upgrade to linux ! Re: Multiprocessing causes BSOD 12 Years Ago by delta_frost Not a viable option :P I actually meant to do some sort of benchmarking by finding out primes in parallel by dividing the task by ranges between the 8 cores on my i7.But running the above code simply freezes the system,not to mention various BSODs at times. Re: Multiprocessing causes BSOD 12 Years Ago by delta_frost Thanks pyTony.The code runs without freezing up the system but does not produce any output http://s16.postimage.org/txd52wyyd/err.png Do I have to import the module and use it in the **IDLE** to get that to work ? Re: Multiprocessing causes BSOD 12 Years Ago by TrustyTony You need to run it properly from command line double click etc. IDLE does not work. Re: Multiprocessing causes BSOD 12 Years Ago by delta_frost Oh!! Thanks a lot.That saved a lot of time. Re: Multiprocessing for an HPC 10 Years Ago by vegaseat You might want to take a look at: https://docs.python.org/dev/library/concurrent.futures.html Re: Multiprocessing for an HPC 10 Years Ago by fatalaccidents Thanks for the response. I think my issue has more to do with how to run a Pool on the backend of a supercomputer. The code is working. Does anyone have any experience with how to go about this? I don't think the concurrent futures module (although it looks like it has some nice features) will take care of this problem for me, unless I'm … Re: Multiprocessing for an HPC 10 Years Ago by vegaseat Sorry, I have no access to a High Performance Computer like a Cray. My basement is just too small to fit one in. Re: Python multiprocessing: How to reload processes when a config is modified 10 Years Ago by vegaseat For another possibility see ... http://greenlet.readthedocs.org/en/latest/ Re: Threading , Multiprocessing Simple program 13 Years Ago by Creatinas Anyone?