From: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Bruce Momjian <bruce(at)momjian(dot)us>, Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers(at)postgresql(dot)org, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
Subject: | Re: profiling connection overhead |
Date: | 2010-12-01 04:32:23 |
Message-ID: | AANLkTik2Y-03aZ-wxNJ3k=dVirCPvcce9-7DFFrFSPXw@mail.gmail.com |
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Lists: | pgsql-hackers |
On 11/28/10, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>
> In a close race, I don't think we should get bogged down in
> micro-optimization here, both because micro-optimizations may not gain
> much and because what works well on one platform may not do much at
> all on another. The more general issue here is what to do about our
> high backend startup costs. Beyond trying to recycle backends for new
> connections, as I've previous proposed and with all the problems it
> entails,
Is there a particular discussion of that matter you could point me to?
> the only thing that looks promising here is to try to somehow
> cut down on the cost of populating the catcache and relcache, not that
> I have a very clear idea how to do that. This has to be a soluble
> problem because other people have solved it.
Oracle's backend start up time seems to be way higher than PG's.
Their main solution is something that is fundamentally a built in
connection pooler with some bells and whistles built in. I'm not
sure "other people" you had in mind--Oracle is generally the one that
pops to my mind.
> To some degree we're a
> victim of our own flexible and extensible architecture here, but I
> find it pretty unsatisfying to just say, OK, well, we're slow.
What about "well OK, we have PGbouncer"? Are there fixable
short-comings that it has which could make the issue less of an issue?
Cheers,
Jeff
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