Newsgroups: comp.sys.next
Path: utzoo!utgpu!jarvis.csri.toronto.edu!eecg.toronto.edu!okrieg
From: okrieg@eecg.toronto.edu ("Orran Y. Krieger")
Subject: Re: NeXT & "threads"
Message-ID: <8810291732.AA27129@ghidrah.eecg.toronto.edu>
Organization: EECG, University of Toronto
References: <10736@reed.UUCP> <363@thor.wright.EDU>
Date: Sat, 29 Oct 88 13:32:03 EDT

I believe that the current version of MACH on Next does not support 
multiple processors. However even when it will, each NEXT CPU board has 
its own local memory etc... Does anyone know if when multiple processor
boards can be put in will they have a global physical address space
(i.e. processor A can address processor B`s memory). Hmmm no cache so
I guess that there would be no consistency problem. However MACH assumes
uniform access time to memory from all processors.  In a recent talk by
someone from BBN we were  told that they had real problems getting around
this assumption. I came away with the belief that they decided that threads
were not worth supporting except on a single processor.  Will this not
also be the case with Next?

-- 

  Orran Krieger
  University of Toronto -- Toronto, Canada

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