Re: cpu throttling

On Thu, Aug 02, 2007 at 09:14:37AM -0700, Alan Hodgson wrote:
> On Thursday 02 August 2007 09:02, "Bryan Murphy" <bryan.murphy@gmail.com>
> wrote:
> > My question:  Is there a way I can decrease the priority of a specific
> > query, or determine the PID of the process it is running in?  I'd like
> > to throw together a quick shell script if at all possible, as right
> > now I have to monitor the process manually and we'll have fixed the
> > problem long before we have the chance to implement proper database
> > clustering.
>
> select procpid from pg_stat_activity  where current_query
>    like '%stored_proc%' and current_query not like '%pg_stat_activity%';
>
> requires stats_command_string to be enabled
>
> I'm surprised your operating system doesn't automatically lower the priority
> of the process, though ..

The OS will only lower it to a certain extent.

Also, make sure you understand the concept of priority inversion before
going into production with this solution.
--
Decibel!, aka Jim Nasby                        decibel@decibel.org
EnterpriseDB      http://enterprisedb.com      512.569.9461 (cell)