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Re: testing HS/SR - 1 vs 2 performance

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Cc: Erik Rijkers <er(at)xs4all(dot)nl>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: testing HS/SR - 1 vs 2 performance
Date: 2010-04-16 12:00:22
Message-ID: 1271419222.8305.8131.camel@ebony (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Fri, 2010-04-16 at 14:47 +0300, Heikki Linnakangas wrote:
> Simon Riggs wrote:
> > On Fri, 2010-04-16 at 11:29 +0300, Heikki Linnakangas wrote:
> >> How does the attached patch look like? It's probably similar to what you
> >> had in mind.
> > 
> > It looks like a second version of what I'm working on and about to
> > publish. I'll take that as a compliment!
> > 
> > My patch is attached here also, for discussion.
> > 
> > The two patches look same in their main parts, though I have quite a few
> > extra tweaks in there, which you can read about in comments.
> Yeah. Yours seems a lot more complex with all those extra tweaks, I
> would suggest to keep it simple. I did realize one bug in my patch: I
> didn't handle xid wraparound correctly in the binary search, need to use
> TransactionIdFollows instead of plan >.

Almost done, yes, much simpler. I wrote a lot of that in the wee small
hours last night, so the difference is amusing.

And I spotted that bug, plus the off by one error also. Just rewritten
all other parts, so no worries.

 Simon Riggs 

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