id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
275	python: Make subprocess use spawn instead of fork+exec	dmik		"OS/2 uses the Posix codepath in subprocess.Popen that results in fork+exec to be used to start a new child. This is very inefficient on OS/2 given that parent data pages are deeply copied (Linux uses copy-on-write which is not available on OS/2 on the kernel level). Given that the subprocess interface clearly defines a child as having no any relation with the parent (other than regular file i/o inheritance and termination notification) this is a big overkill.

The WIndows code uses the StartProcess WINAPI (which is exposed to Python). We may simply use the spawn C api (which is internally DosExecPgm) and this looks like the right thing to do because fork on Posix there is a clear misuse (I guess there was no portable spawn implementation in Posix when this code was written)."	enhancement	closed	major		python		low	fixed