On 25.12.2011 21:48, Robert Haas wrote:
> On Fri, Dec 23, 2011 at 2:54 PM, Heikki Linnakangas
> <heikki.linnakangas@enterprisedb.com> wrote:
>> Sorry. Last minute changes, didn't retest properly.. Here's another attempt.
>
> I tried this one out on Nate Boley's system. Looks pretty good.
> [pgbench results]
Great, thanks for the testing!
> Unfortunately, it does look like there is some raw loss of performance
> when WALInsertLock is NOT badly contended; hence the drop-off at a
> single client on permanent tables, and up through 24 clients on
> unlogged tables.
Hmm, I haven't been able to put my finger on what's causing that.
Anyway, here's a new version of the patch. It no longer busy-waits for
in-progress insertions to finish, and handles xlog-switches. This is now
feature-complete. It's a pretty complicated patch, so I would appreciate
more eyeballs on it. And benchmarking again.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
