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echo: os2prog
to: Dean Roddey
from: Patrick Haller
date: 1994-12-03 12:29:06
subject: Os/2 Smp

Hi Dean!

[..]
 PH>> This machine does second-level-cache multiprocessing,  doesn't it ?
 PH>> Might this be the reason for the slowdown (two  threads/apps access
 PH>> the same memory areas) ? 
 DR> But, just as a practical matter, if multiple threads accessing the
same memory causes that bad
 DR> a performance degredation, then what good is SMP? 
It is not only as good as the used CPUs are - but I think it is also as
"good" as the used chipset and mechanisms. Second Level Cache SMP
is kind of "ugly". There should be faster methods, I think.

[Dell machine not being a totally happy SMP machine]
May be, haven't got one yet :)

[..]
 DR> Also, what would you think would cause the interesting results of
the little test program?
I must have missed sth. What test program ?

     __      2:246/2320.18{at}Fidonet
     |_)     81:449/8810.18{at}OS2Net
cu/2 |atrick Haller{at}ti-nov1.fbe.fh-weingarten.de

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