Horton

Re: WIP - Add ability to constrain backend temporary file space

Josh Berkus <josh@agliodbs.com>

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From: Josh Berkus <josh@agliodbs.com>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Mark Kirkwood <mark.kirkwood@catalyst.net.nz>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2011-02-18T19:48:24Z
Lists: pgsql-hackers 
On 2/18/11 11:44 AM, Robert Haas wrote:
> On Fri, Feb 18, 2011 at 2:41 PM, Josh Berkus <josh@agliodbs.com> wrote:
>> Second, the main issue with these sorts of macro-counters has generally
>> been their locking effect on concurrent activity.  Have you been able to
>> run any tests which try to run lots of small externally-sorted queries
>> at once on a multi-core machine, and checked the effect on throughput?
> 
> Since it's apparently a per-backend limit, that doesn't seem relevant.

Oh!  I missed that.

What good would a per-backend limit do, though?

And what happens with queries which exceed the limit?  Error message?  Wait?


-- 
                                  -- Josh Berkus
                                     PostgreSQL Experts Inc.
                                     http://www.pgexperts.com