On Feb 16, 2009, at 11:11 AM, Brian Aker wrote:
Hi!
On Feb 16, 2009, at 10:12 AM, MARK CALLAGHAN wrote:
I am not sure what a scoreboard is. Our implementation updates global
The term "scoreboard" comes from Apache. Basically the idea is a
global array that is lockless. Each session has its own N line in
the array that it updates. All reads across the structure are done
without locks. So any sort of "reads" from it to create accumulated
data are dirty. If you know max_connections the array is easy to
setup, though there is a cost for finding a slot for the incoming
session.
Doesn't Drizzle already have a slot value in the Session object? I
saw it the other day while working thru some storage engine stuff.
--
Mark Atwood <http://mark.atwood.name>
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