David Binger wrote:

> On Feb 9, 2005, at 11:14 AM, Graham Fawcett wrote:
>
>> Has anyone considered, demoed or implemented a session-affinity
>> mechanism in mod_scgi? In other words, once a "session" has been
>> instantiated for a user from an SCGI process, all future requests in
>> that session will be handled by the same process. (Definition of
>> "session" is intentionally vague, since I'm fishing.)
>
> Would the purpose be to get the process
> that probably has the best cache for this session,
> or are you thinking of some kind of guaranteed condition?

Good question. Although I could see caching benefits, I'm looking for
the guaranteed condition. I would like keep a given (rather large)
dataset in process memory, bound to a user session. I'd like to
accomplish this with multiple SCGI processes, without an ACID database,
and without my own IPC between SCGI processes. Since only one user
session may have a given dataset at one time, a session-affinity
mechanism would work well.

I hope it doesn't sound contrived. I do see how such an approach ought
to allow this app to perform (and scale) very well (barring
inefficiencies in the affinity mechanism).

-- Graham