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POHow to determine pid of process started via os.system
 

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    1. USSebastian Werk
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    1. CO*"therefore the subprocess `Popen(["python", "bar.py", "arguments"])` is too slow."* -- have you actually measured it? [The question that you've linked](http://stackoverflow.com/questions/10888846/python-subprocess-module-much-slower-than-commands-deprecated) shows different case and anyway the time difference is a couple of milliseconds.
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    2. COYes, I have measured it. It was around 20 to 30ms, which was in my specific case too slow, since I had a scrolling graphic, which had to be updated multiple times per second. `os.spawnl` gave me the desired functionality, even though it added around one second to start each process, but without stopping my main process. It is still not the ideal solution, but for my case bettern than `subprocess.Popen`.
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    3. COYou should've mentioned it in the question (ideally, with a complete minimal code example that other people can try). Beware `spawn` inherits all inheritable file descriptors (`Popen` closes them (Python 3)). Can you start processes before hand and pause them and then only unpause them (send input or a signal)? Why can't you use `bar.py` script in the same process? btw, why `spawn` would add a whole second to the starting of a process compared to `Popen`?
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