Re: i know cary millsap is super smart but...

From: Cary Millsap <cary.millsap_at_method-r.com>
Date: Fri, 14 Jun 2013 20:04:18 -0500
Message-ID: <CAJOkrQYnqV6WLgRJvrDSupwoNbYYvm1MA-dZvpsKyx-Mp-HWoA_at_mail.gmail.com>

Josh and Adam,
I was just discussing that this week with a client. I've asked the same question, and I just haven't done the tests yet.

My expectation would be that for a two-quad-core system, the number of "effective CPUs" (let's call it) would be something less than 2 x 4 = 8 but more than just 2. Probably 6-ish, I would expect. ...Meaning that on a 2x quad-core system, you could apply the idea behind the paper as if the actual number of CPUs were something like 6.

I'd love to learn what you find out if you test it.

Cary Millsap
Method R Corporation

On Fri, Jun 14, 2013 at 2:37 PM, Adam Musch <ahmusch_at_gmail.com> wrote:

> I would think so, from a certain point of view. Each core is reported to
> the OS as a CPU, and that's what you should use at it pertains to the rule
> of 2. So if you have two cpus each with four course, your rule of 2 number
> would be 8.
> The underlying mathematics of queuing theory still remain the same.
>
>
> On Fri, Jun 14, 2013 at 2:08 PM, Josh Collier <Josh.Collier_at_banfield.net
> >wrote:
>
> > This paper is 13 years old, is it still valid in the era of quad core
> > processors?
> > Batch Queue Management and the Magic of '2'
> > Cary Millsap/Hotsos Enterprises, Ltd.
> >
> > --
> > http://www.freelists.org/webpage/oracle-l
> >
> >
> >
>
>
> --
> Adam Musch
> ahmusch_at_gmail.com
>
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>

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Received on Sat Jun 15 2013 - 03:04:18 CEST