Re: 9.2beta1, parallel queries, ReleasePredicateLocks, CheckForSerializableConflictIn in the oprofile

Merlin Moncure <mmoncure@gmail.com> writes:
> On Fri, May 25, 2012 at 11:17 AM, Stephen Frost <sfrost@snowman.net> wrote:
>> Didn't we implement a system whereby this is exactly what we intend to
>> happen on the read side- that is, everyone doing a SeqScan gangs up on
>> one ring buffer and follows it, which we felt was going to dramatically
>> improve performance in some cases?

> yeah:
> ...
> I wonder if the logic here is just being too strict...

I don't recall how much evidence there is behind the NBuffers/4 threshold.
Maybe that needs some tuning?
        regards, tom lane