The last time I checked, an individual CICS region was limited by the
engine size. This means that, even if you had work that a 2 x 50 MIPS could
handle according to raw MIPS, if you had a CICS region which required 75 MIPS
to deliver acceptable response times, you were hosed on such a system, whereas
a 100MIPS uni would work just fine. Indeed, we may be approaching such a
limitation here.
OTOH, DB2 (for one) can sometimes see better performance on a
multi-processor machine than on a uni-processor due to the potential for
parallelism.
In other words, it depends.
Jon
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