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    <p>Using Twisted for this sounds like it makes sense. The low-level API that supports running processes in Twisted is <a href="http://twistedmatrix.com/documents/current/api/twisted.internet.interfaces.IReactorProcess.html" rel="nofollow">reactor.spawnProcess</a>. Some examples of its usage are given in the <a href="http://twistedmatrix.com/documents/current/core/howto/process.html" rel="nofollow">process howto</a> document.</p> <p>This API is well suited for dealing with many long running processes, and as with all I/O APIs in Twisted, it works well when combined with another event source, such as <a href="http://twistedmatrix.com/documents/current/web/howto/web-in-60/index.html" rel="nofollow">a web server</a> users can use to request new processes be started up.</p> <p><code>reactor.spawnProcess</code> is more like the standard library subprocess module than like the <code>multiprocessing</code> package. It gives you a way to launch a child process running a particular executable, with particular arguments, etc. It does not provide a high-level API for running a particular Python function in another process. However, it's not too hard to build such a thing (at least for a particular case). Consider this approach:</p> <pre><code>from sys import executable from os import environ from twisted.internet import reactor implementation = """\ from yourapp import somefunction somefunction() """ reactor.spawnProcess(executable, [executable, "-c", implementation], env=environ) reactor.run() </code></pre> <p>This just launches a new Python interpreter (whichever one you happen to be running) and uses the -c option to specify a program on the command line for it to run.</p>
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    1. POHow to spawn long-running-processes in Twisted
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    1. USJean-Paul Calderone
    1. USJean-Paul Calderone
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    1. COOkay, the reactors in the pool-server and in a long-running-process will be different, won't be it?
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      1. USMaxim Kolchin
    2. COI didn't find an example or documentation about how to spawn a process like `p = Process(target=function_name); p.start();` in _multiprocessing_ module.
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      1. USMaxim Kolchin
    3. COThere's typically exactly one reactor. I updated the answer to address the *multiprocessing* comparison.
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