[GRLUG] FYI - old mysql and new gear

[Bob Kline]

Affinity is something like tendency.
The scheduler will do what you ask
"as long as practical for performance
reasons."

Seems to me if that gets your job
done, fine, but might just be a multi
core version of "nice," in that you get
a little more priority if possible - but no
guarantees.

Things like the old CDC 6600 OS
allowed things called "shot jobs,"
where you could have the entire
machine for a while, but the OS was
a long way from Linux.

   -- Bob


On Thu, Sep 22, 2011 at 2:29 PM, Mike Williams <knightperson at zuzax.com>wrote:

>  On 9/22/2011 2:20 PM, scott.tanner at comcast.net wrote:
>
> I'm very familiar with nice, but its the taskset command I was referring
> to, which takes affect at the scheduler:
>
>
> http://www.cyberciti.biz/tips/setting-processor-affinity-certain-task-or-process.html
>
>
> Regards,
> Scott
>
> That's good stuff to know for the day when I get to play with a box that
> has more than2 actual cores. Regarding turning off hyperthreading, I assume
> it's known which pairs of CPU's are actually the same core? Maybe you could
> see if there's any performance difference running it on 1, 3, 5, and 7
> versus 1, 2, 3, and 4 (assuming that 1 and 2 are core the first core, 2 and
> 3 are the second, etc).
>
>
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