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PostgreSQL Scalability Analysis Deconstructed
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DrQ  
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 More options Apr 11 2012, 1:51 pm
From: DrQ <redr...@yahoo.com>
Date: Wed, 11 Apr 2012 10:51:38 -0700 (PDT)
Local: Wed, Apr 11 2012 1:51 pm
Subject: PostgreSQL Scalability Analysis Deconstructed
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Latest blog post<http://perfdynamics.blogspot.com/2012/04/postgresql-scalability-analy...>examining how to apply the USL scalability model to Postgres performance
measurements.

" if you are going to use it, then it is really in your own interest to
learn to use it correctly. It's not just a matter of throwing performance
data at the USL model and seeing if the plots look like what you were
expecting. If the USL always did what we expected, there would be little
point in doing it at all. No new insights would be gleaned."

"In case you think that's a completely crazy projection coming from the
USL, then check out<http://rhaas.blogspot.com/2011/09/scalability-in-graphical-form-analy...> what
actually happened to the newer version of Postgres with the so-called *fast
locking* modification. Those PG 9.2 throughput measurements, shown as green
joined data points<http://2.bp.blogspot.com/-2Ft63JuwHO8/ToXX4zw2X8I/AAAAAAAAAEs/l3i3ESL...>,
reached an Xroof that is *5x* higher than expected from the PG 9.1 data. "


 
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