[horde] memcache session handler

[Chuck Hagenbuch]

Quoting liamr at umich.edu:

>> Are you using persistent connections?
>
> Yes.  We've got lots of children on each of the boxes.  Should we not
> use persistent connections?

It's certainly worth trying without. Persistent connections mean that 
you have one connection open per apache child per server that you're 
connecting to, so you need to have at least as many allowed connections 
as apache children.

-chuck

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