| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Reducing Transaction Start/End Contention |
| Date: | 2007-09-14 03:52:19 |
| Message-ID: | 20070914035219.GA12618@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-hackers |
Bruce Momjian wrote:
>
> This has been saved for the 8.4 release:
>
> http://momjian.postgresql.org/cgi-bin/pgpatches_hold
I think the work on VIDs and latestCompletedXid make this completely
obsolete.
> ---------------------------------------------------------------------------
>
> Simon Riggs wrote:
> > Jignesh Shah's scalability testing on Solaris has revealed further
> > tuning opportunities surrounding the start and end of a transaction.
> > Tuning that should be especially important since async commit is likely
> > to allow much higher transaction rates than were previously possible.
> >
> > There is strong contention on the ProcArrayLock in Exclusive mode, with
> > the top path being CommitTransaction().
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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