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Re: testing HS/SR - 1 vs 2 performance

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Simon Riggs <simon(at)2ndquadrant(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 23:07:15
Message-ID: s2y603c8f071004231607jf4468c06y185817dc274e0c9e@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Fri, Apr 23, 2010 at 6:39 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> 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.

Both Heikki and I objected to that patch.  And apparently it doesn't
fix the problem, either.  So, -1 from me.

...Robert

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