Hi,

I think that a NUMA architecture machine can solve the problem....

A +
Le 11/04/2011 15:04, Glyn Astill a écrit :

Hi Guys,

I'm just doing some tests on a new server running one of our heavy select 
functions (the select part of a plpgsql function to allocate seats) 
concurrently.  We do use connection pooling and split out some selects to slony 
slaves, but the tests here are primeraly to test what an individual server is 
capable of.

The new server uses 4 x 8 core Xeon X7550 CPUs at 2Ghz, our current servers are 
2 x 4 core Xeon E5320 CPUs at 2Ghz.

What I'm seeing is when the number of clients is greater than the number of 
cores, the new servers perform better on fewer cores.

Has anyone else seen this behaviour?  I'm guessing this is either a hardware 
limitation or something to do with linux process management / scheduling? Any 
idea what to look into?

My benchmark utility is just using a little .net/npgsql app that runs 
increacing numbers of clients concurrently, each client runs a specified number 
of iterations of any sql I specify.

I've posted some results and the test program here:

http://www.8kb.co.uk/server_benchmarks/




--
Frédéric BROUARD - expert SGBDR et SQL - MVP SQL Server - 06 11 86 40 66
Le site sur le langage SQL et les SGBDR  :  http://sqlpro.developpez.com
Enseignant Arts & Métiers PACA, ISEN Toulon et CESI/EXIA Aix en Provence
Audit, conseil, expertise, formation, modélisation, tuning, optimisation
*********************** http://www.sqlspot.com *************************


--
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance

Reply via email to