...
Now I'm curious where the new knee of the curve is at which adding one
additional instruction processor results in a net loss of throughput for a
processor complex due to inter-processor serialization.
...
It depends on who you ask.
The LSPR throughput figures for anything above 16 are suspect.
IBM doesn't directly admit it, but there is a one line disclaimer on the z/990
chart stating that everything above 16 is straight-lined.
They didn't run anything above 16.
There was a discussion last year on this.
Take the numbers an plot them: there is no degradation after 16.
-teD
In God we Trust!
All others bring data!
--Deming
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