>I know 4 has been discussed in IBM-MAIN but the closest documented thing I can 
>find (unless I missed it), is the System Health. Checker, which specifies 3 as 
>the minimum by default in the check. 

I've gone with three (large) locals, minimum for almost 20 of my 30 years in 
the field.
I've only seen two large systems (3000+ MIPS) that needed more.
One went to 5 locals, which we clawed back one after we went 64-bit and added 
more memory, than was previously possible.
The best page I/O is still the one that doesn't happen.
-
Too busy driving to stop for gas!

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