are "long running processes" resource intensive?

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I am wondering why python is more expensive to host than php. I have
read that is because python requires long running processes (LRPs),
and those LRPs eat up resources. Of couse that means that a shared
hosting providing can not fit as many accounts on the same machine, so
the hoster much charge more for each account.

But, I have also read that LRPs are actually more efficient than CGI.
But, python LRPs present a a risk of crashing the system.

Also, if python is run with mod_python, does that create an LRP? Does
mod_php create an LRP. Does rupy, or perl create LRPs?

Can anybody clear this up for me?

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