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RE: Restricting number of CPUs



Red Hat defines physical CPUs equivalently to sockets, so a multi-core and/or
hyperthreading CPU is counted as a single socket when determining which
subscription to purchase

<http://www.redhat.com/rhel/compare/>

Check the bottom of the page.


Quoting "Wilson, Craig" <wilson craig hp com>:

> Hi Guys,
>
> On CPU's, does Red Hat count duel core as 1 CPU or 2 and what about
> Quad's?
>
> Cheers
>
> Craig.
>
> -----Original Message-----
> From: redhat-list-bounces redhat com
> [mailto:redhat-list-bounces redhat com] On Behalf Of Young, Mike
> Sent: Wednesday, April 11, 2007 6:53 AM
> To: General Red Hat Linux discussion list
> Subject: RE: Restricting number of CPUs
>
> Excellent!  I thought there was something like that.  I'll try that
> first, then get physical if it doesn't work.
>
> Thanks,
> Mike.
>
>  -----Original Message-----
> From: 	redhat-list-bounces redhat com
> [mailto:redhat-list-bounces redhat com]  On Behalf Of Barry Brimer
> Sent:	Tuesday, April 10, 2007 3:47 PM
> To:	General Red Hat Linux discussion list
> Subject:	Re: Restricting number of CPUs
>
> Quoting "Young, Mike" <Mike Young atosorigin com>:
>
> > Hello,
> >
> > We have 4 CPUs installed in a server, but would like to limit it to
> only 2,
> > since an application is priced per CPU.  Rather than taking the CPUs
> out of
> > the box physically, is there a way to lower the CPU count - maybe in
> > /etc/sysctl.conf?
>
> To limit the entire system to a certain number of CPUs, add "maxcpus=X"
> to your
> kernel line in your grub.conf (without the quotes) and replace "X" with
> the
> number of CPUs you want the kernel to see.
>
> <http://kbase.redhat.com/faq/FAQ_80_602.shtm>
>
> To limit an application to a certain number of CPUs, use the taskset
> program
> included in RHEL.
>
> <http://kbase.redhat.com/faq/FAQ_43_3918.shtm>
>
> HTH,
> Barry
>
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