[CSC 435] Super Fast Code Results (Don't Believe Everything you See)

[Andrew J. Pounds]

Okay -- before we all stand in awe of the code performance we saw from 
Long's DGEMM BLAS runs today (which a little off the cuff calculation in 
my head appeared to be in the hundreds of  gigaflops range) -- try the 
following test.

Make ONE of the matrices used in the product calculation something other 
than the identity matrix and retry the calculation.  You should get 
something much more realistic (in the hundreds of  megaflops range). 

Can you tell me what is going on?


-- 
Andrew J. Pounds, Ph.D.  (pounds at theochem.mercer.edu)
Associate Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627