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Subject: Re: The Future: Asymetrical Multiprocessing

Author: Robert Henry Durrett

Date: 07:43:09 06/19/02

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On June 19, 2002 at 07:41:16, Andrew Dados wrote:

>On June 18, 2002 at 21:38:49, Robert Henry Durrett wrote:
>
>>On June 18, 2002 at 21:08:00, Tom Kerrigan wrote:
>>
>>>On June 18, 2002 at 20:35:00, Robert Henry Durrett wrote:
>>>
>>>>Well, if people only resort to AMP when they absolutely have no choice, then
>>>>they are unlikely to discover any of AMPs merits.  It is only when they are
>>>>willing to explore the unknown that they will see what is possible.
>>>
>>>The thing is, SMP is kind of a superset of AMP. You can do message passing on an
>>>SMP computer if you want, but it's kind of a waste. (Extra work involved.)
>>
>>The big question in my mind is "Yes, but what ELSE can you do with AMP?"  In a
>>single processor, the interaction between parallel paths is fixed.  The
>>programmer can do little or nothing about it.  But with separate processors, the
>>programmer has more options, or more flexibility.  [Or, at least, that's my
>>perception of the situation.]
>
>I think this is wrong.
>You can always simulate AMP with SMP without big performance hit;
>the other way around is almost impossible.
>
>-Andrew-

(1)  Doesn't simulation imply a big performance hit?

(2)  Why would you ever want to simulate SMP?

Bob D.



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