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The problem is that the stdin stream for each process is being left open and needs to be closed. To demonstrate the issue, we create a single process: $process = StartProcess[$SystemShell]; WriteLine[$process, "echo example line"]; KillProcess[$process]; The call to WriteLine implicitly creates a stream object. Even though the process has been killed, ...


We had a bug like this on v. 10: it specifically stopped running new processes after you created 100 of them. This was fixed in version 10.0.1. I recommend testing it there, as version 10.0.1 has a number of improvements with respect to StartProcess. I can't test your example in MacOS right now, so please let me know if this isn't working on v. 10.0.1. ...

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