Re: Fixed xloginsert_locks for 9.4

On Fri, Oct  3, 2014 at 02:07:45PM -0400, Bruce Momjian wrote:
> On Fri, Oct  3, 2014 at 03:00:56PM -0300, Arthur Silva wrote:
> >     I remember Informix had a setting that had no description except "try
> >     different values to see if it helps performance" --- we don't want to do
> >     that.
> > 
> >     What if we emit a server message if the setting is too low?  That's how
> >     we handle checkpoint_segments.
> > 
> > Not all GUC need to be straight forward to tune.
> > If the gains are worthy I don't see any reason not to have it.
> 
> Every GUC add complexity to the system because people have to understand
> it to know if they should tune it.  No GUC is zero-cost.

Please see my blog post about the cost of adding GUCs:
http://momjian.us/main/blogs/pgblog/2009.html#January_10_2009

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + Everyone has their own god. +