Re: WIP - Add ability to constrain backend temporary file space
Robert Haas <robertmhaas@gmail.com>
From: Robert Haas <robertmhaas@gmail.com>
To: Josh Berkus <josh@agliodbs.com>
Cc: Mark Kirkwood <mark.kirkwood@catalyst.net.nz>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2011-02-18T20:37:34Z
Lists: pgsql-hackers
On Fri, Feb 18, 2011 at 2:48 PM, Josh Berkus <josh@agliodbs.com> wrote: > 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? Well I have not RTFP, but I assume it'd throw an error. Waiting isn't going to accomplish anything. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company