Re: [PERFORM] 60 core performance with 9.3

2014-08-14 Thread Mark Kirkwood

On 15/08/14 06:18, Josh Berkus wrote:

Mark,

Is the 60-core machine using some of the Intel chips which have 20
hyperthreaded virtual cores?

If so, I've been seeing some performance issues on these processors.
I'm currently doing a side-by-side hyperthreading on/off test.



Hi Josh,

The board has 4 sockets with E7-4890 v2 cpus. They have 15 cores/30 
threads. We've running with hyperthreading off (noticed the usual 
steep/sudden scaling dropoff with it on).


What model are your 20 cores cpus?

Cheers

Mark






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Re: [PERFORM] 60 core performance with 9.3

2014-08-14 Thread Josh Berkus
Mark,

Is the 60-core machine using some of the Intel chips which have 20
hyperthreaded virtual cores?

If so, I've been seeing some performance issues on these processors.
I'm currently doing a side-by-side hyperthreading on/off test.

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com


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