Re: Turn off Hyperthreading! WAS: 60 core performance with 9.3

On Thu, Aug 21, 2014 at 3:26 PM, Scott Marlowe <scott.marlowe@gmail.com> wrote:
> On Thu, Aug 21, 2014 at 3:02 PM, Josh Berkus <josh@agliodbs.com> wrote:
>> On 08/20/2014 07:40 PM, Bruce Momjian wrote:
>>
>>> I am also
>>> unclear exactly what you tested, as I didn't see it mentioned in the
>>> email --- CPU type, CPU count, and operating system would be the minimal
>>> information required.
>>
>> Ooops!  I thought I'd posted that earlier, but I didn't.
>>
>> The processors in question is the Intel(R) Xeon(R) CPU E7- 4850, with 4
>> of them for a total of 40 cores or 80 HT cores.
>>
>> OS is RHEL with 2.6.32-431.3.1.el6.x86_64.
>
> I'm running almost the exact same setup in production as a spare. It
> has 4 of those CPUs, 256G RAM, and is currently set to use HT. Since
> it's a spare node I might be able to do some testing on it as well.
> It's running a 3.2 kernel right now. I could probably get a later
> model kernel on it even.
>
> --
> To understand recursion, one must first understand recursion.

To update this last post, the machine I have is running ubuntu 12.04.1
right now, and I have kernels 3.2, 3.5, 3.8, 3.11, and 3.13 available
to put on it. We're looking at removing it from our current production
cluster so I could likely do all kinds of crazy tests on it.