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The problem with threads and sockets is performance, there's no select, only poll for each socket. This will be rather nasty in the thread that manages the connections from child processes, unless we launch a new thread per child. And given that only a single python thread can run at a time...
Given all these complications, to me it's just more reasonable to export in process ->work out of process -> import in process rather than try to do everything out of process. The cost is one extra copy per file. Which given the file sizes of typical books seems fairly reasonable to me.
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