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Subject: Re: hardware advice
From: Evgeny Shishkin <itparanoia@gmail.com>
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 <CAOR=d=1zkfc_Q=6p5Oem6CcFHrKo_z3Km6AEMHkRj_2321d2Rg@mail.gmail.com>
Date: Fri, 28 Sep 2012 01:40:06 +0400
Cc: Claudio Freire <klaussfreire@gmail.com>,
	David Boreham <david_list@boreham.org>, pgsql-performance@postgresql.org
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References: <5064A4DC.5090304@turnkey.bz> <5064ABA1.7030507@boreham.org>
	<5064BB66.2080202@optionshouse.com> <5064C033.90506@boreham.org>
	<CAGTBQpaT6=4hJadHWuLzQ=JeBTXLE_8_oFB4P42NVKXvqmC0kg@mail.gmail.com>
	<CAOR=d=1zkfc_Q=6p5Oem6CcFHrKo_z3Km6AEMHkRj_2321d2Rg@mail.gmail.com>
To: Scott Marlowe <scott.marlowe@gmail.com>


On Sep 28, 2012, at 1:36 AM, Scott Marlowe <scott.marlowe@gmail.com> =
wrote:

> On Thu, Sep 27, 2012 at 3:16 PM, Claudio Freire =
<klaussfreire@gmail.com> wrote:
>> On Thu, Sep 27, 2012 at 6:08 PM, David Boreham =
<david_list@boreham.org> wrote:
>>>>=20
>>>> We went from Dunnington to Nehalem, and it was stunning how much =
better
>>>> the X5675 was compared to the E7450. Sandy Bridge isn't quite that =
much of a
>>>> jump though, so if you don't need that kind of bleeding-edge, you =
might be
>>>> able to save some cash. This is especially true since the E5-2600 =
series has
>>>> the same TDP profile and both use 32nm lithography.
>>>=20
>>> We use Opteron on a price/performance basis. Intel always seems to =
come up
>>> with some way to make their low-cost processors useless (such as =
limiting
>>> the amount of memory they can address).
>>=20
>> Careful with AMD, since many (I'm not sure about the latest ones)
>> cannot saturate the memory bus when running single-threaded. So, =
great
>> if you have a high concurrent workload, quite bad if you don't.
>=20
> Conversely, we often got MUCH better parallel performance from our
> quad 12 core opteron servers than I could get on a dual 8 core xeon at
> the time.  The newest quad 10 core Intels are about as fast as the
> quad 12 core opteron from 3 years ago.  So for parallel operation, do
> remember to look at the opteron.  It was much cheaper to get highly
> parallel operation on the opterons than the xeons at the time we got
> the quad 12 core machine at my last job.
>=20


But what about latency, not throughput?=