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Re: Admission Control

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Admission Control
Date: 2010-06-25 20:44:10
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Lists: pgsql-hackers
On Fri, Jun 25, 2010 at 3:52 PM, Kevin Grittner
<Kevin(dot)Grittner(at)wicourts(dot)gov> wrote:
> Heck, I think an even *more* trivial admission control policy which
> limits the number of active database transactions released to
> execution might solve a lot of problems.

That wouldn't have any benefit over what you can already do with a
connection pooler, though, I think.  In fact, it would probably be
strictly worse, since enlarging the number of backends slows the
system down even if they aren't actually doing anything much.

> Of course, what you
> propose is more useful, although I'd be inclined to think that we'd
> want an admission control layer which could be configured so support
> both of these and much more.  Done correctly, it could almost
> completely eliminate the downward slope after you hit the "knee" in
> many performance graphs.

And world peace!

Robert Haas
The Enterprise Postgres Company

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