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Re: help offered

To: alan@lxorguk.ukuu.org.uk (Alan Cox), ariel@cthulhu.engr.sgi.com
Subject: Re: help offered
From: "Greg Chesson" <greg@xtp.engr.sgi.com>
Date: Wed, 25 Nov 1998 13:04:47 -0800
Cc: galibert@pobox.com, linux@cthulhu.engr.sgi.com
In-reply-to: alan@lxorguk.ukuu.org.uk (Alan Cox) "Re: help offered" (Nov 25, 9:46pm)
References: <m0zimlz-0007U1C@the-village.bc.nu>
Sender: owner-linux@cthulhu.engr.sgi.com
One definition of OS scalability that I have not seen
in general use is this:

        an OS scales to S number of processors if all S processors
        can be executing in the kernel at the same time.

An OS that scales to S active kernels can usually operate hardware
with P processors, where P > S.  A system for 1P should
be able to handle 2P with a little work.  I expect a lightweight kernel
like Linux to handle 4p with a few locks if on average only one of the
4p is in the kernel.  I'd suggest that the LInux kernel is at present
(1S, 4p) or maybe (1.5S, 4P).

g

-- 
Greg Chesson

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