Steve, You raise some very good (and obvious) issues I did'nt consider. I'll look further into this sort of implementation as I'm quite interested.
I suppose a compromise could be to load the objects from a pickle, that may have issues in terms of updating the pickle perhaps, though it would be much safer. I'll continue to investigate, thanks for your input. On Feb 1, 2008 11:00 AM, Steve Holden <[EMAIL PROTECTED]> wrote: > Mike D wrote: > > Steve, > > > > Thanks for the response. My question really comes down to, as you > > suggested, premature optimization. > > > > It is more for my own understanding than a current practical use. > > > > If an object is loaded into memory and other threads(or processes) can > > recieve a pointer to this location, would this not be more efficient > > than to load a new one for every unique request? Wouldn't a method such > > as this prevent bottle necks in a read heavy environment? > > > In theory, yes. In practice there are problems, since modern operating > systems are explicitly designed to place barriers between the address > spaces of different processes. > > Even supposing you could access another Python process's space freely > you would then have issues like: > * does a reference from a foreign process add to an > object's reference count? > * if so, what happens if the foreign process terminates > without decrementing the reference count > * otherwise waht happens if the owning process disposes of > the object while the foreign process stil wants to refer > to it. > > I don't wish to be unkind, but these are well-known issues of > inter-process information sharing, and while superficial solutions can > seem easy, the more you think about and work on them the more obvious it > becomes that these are hard problems in the general case. > > Which will hopefully at least encourage you that you are addressing the > real issues of computing, even though there's a lot to do. > > > [...] > > regards > Steve > -- > Steve Holden +1 571 484 6266 +1 800 494 3119 > Holden Web LLC http://www.holdenweb.com/ > > -- > http://mail.python.org/mailman/listinfo/python-list >
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