> > > >---- Original Message ---- >From: [email protected] >To: [email protected] >Subject: Re: Debian stock kernel config -- CONFIG_NR_CPUS=32? >Date: Fri, 22 Oct 2010 12:44:39 -0500 > >>On 10/22/2010 10:34 AM, [email protected] wrote: >>>> >>>> ---- Original Message ---- >>>> From: [email protected] >>>> To: [email protected] >>>> Subject: Re: Debian stock kernel config -- CONFIG_NR_CPUS=32? >>>> Date: Fri, 22 Oct 2010 02:00:45 -0500 >>>> >>>>> >>>>> Correct. The amount of effort needed for cross-CPU >communication, >>>>> cache coherency and OS process coordination increases much more >than >>>> >>>>> linearly as you add CPUs. >>> >>> In fact IIRC the additional overhead follows the square of the >number >>> of CPUs. >> Ron et al See the following: http://en.wikipedia.org/wiki/Amdahl's_law Larry >>Maybe in brute-force implementations, but otherwise the machine >>would bog down after just a few CPUs. >> >>Note that h/w engineers and OS designers/writers have put a lot of >>work into minimizing the overhead and maximize the parallelism of >>extra CPUs. >> >>-- >>Seek truth from facts. >> >> >>-- >>To UNSUBSCRIBE, email to [email protected] >>with a subject of "unsubscribe". Trouble? Contact >[email protected] >>Archive: http://lists.debian.org/[email protected] >> >>
-- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
