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Re: testing HS/SR - 1 vs 2 performance

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Erik Rijkers <er(at)xs4all(dot)nl>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: testing HS/SR - 1 vs 2 performance
Date: 2010-04-23 22:39:48
Message-ID: 1272062388.4161.848.camel@ebony (view raw or flat)
Thread:
Lists: pgsql-hackers
On Fri, 2010-04-23 at 11:32 -0400, Robert Haas wrote:
> >
> > 99% of transactions happen in similar times between primary and standby,
> > everything dragged down by rare but severe spikes.
> >
> > We're looking for something that would delay something that normally
> > takes <0.1ms into something that takes >100ms, yet does eventually
> > return. That looks like a severe resource contention issue.
> 
> Wow.  Good detective work.

While we haven't fully established the source of those problems, I am
now happy that these test results don't present any reason to avoid
commiting the main patch tested by Erik (not the smaller additional one
I sent). I expect to commit that on Sunday.

-- 
 Simon Riggs           www.2ndQuadrant.com


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