mccalpin@masig3.masig3.ocean.fsu.edu (John D. McCalpin) (10/30/89)
Does anyone have the figures handy for the peak speed of the Cray X/MP, the Cray Y/MP, and the Cray 2 for vector divide operations? I know that Cray uses an approximate reciprocal scheme, but I need to know how many cycles per result are required for a plain vector divide, i.e. DO 100 I=1,N A(I) = B(I)/C(I) 100 CONTINUE On the Cyber 205 and ETA-10, the number is 6 cycles per element, and I am trying to figure out if that is a representative number for vector machines. I am using this information to modify the work estimates for various implicit and explicit finite-difference schemes used in fluid dynamics. -- John D. McCalpin - mccalpin@masig1.ocean.fsu.edu mccalpin@scri1.scri.fsu.edu mccalpin@delocn.udel.edu