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Re: Two identical systems, radically different performance

From: Craig James <cjames(at)emolecules(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Two identical systems, radically different performance
Date: 2012-10-08 23:40:31
Message-ID: CAFwQ8rcyCKcoeEn62_QHMRSmJM03ULERtW6_R=3TaO0twOEV9A@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
Nobody has commented on the hyperthreading question yet ... does it really
matter? The old (fast) server has hyperthreading disabled, and the new
(slower) server has hyperthreads enabled.

If hyperthreading is definitely NOT an issue, it will save me a trip to the
co-lo facility.

Thanks,
Craig

On Mon, Oct 8, 2012 at 3:29 PM, Craig James <cjames(at)emolecules(dot)com> wrote:

> One mistake in my descriptions...
>
> On Mon, Oct 8, 2012 at 2:45 PM, Craig James <cjames(at)emolecules(dot)com> wrote:
>
>> This is driving me crazy.  A new server, virtually identical to an old
>> one, has 50% of the performance with pgbench.  I've checked everything I
>> can think of.
>>
>> The setups (call the servers "old" and "new"):
>>
>> old: 2 x 4-core Intel Xeon E5620
>> new: 4 x 4-core Intel Xeon E5606
>>
>
> Actually it's not 16 cores.  It's 8 cores, hyperthreaded.  Hyperthreading
> is disabled on the old system.
>
> Is that enough to make this radical difference?  (The server is at a
> co-location site, so I have to go down there to boot into the BIOS and
> disable hyperthreading.)
>
> Craig
>

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Subject: Re: Two identical systems, radically different performance
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