The STREAM benchmark a synthetic benchmark program, written in standard Fortran 77 (with a corresponding version in C). It measures the the performance of four long vector operations. These operations are:
------------------------------------------
per iteration:
name kernel bytes FLOPS
------------------------------------------
COPY: a(i) = b(i) 16 0
SCALE: a(i) = q*b(i) 16 1
SUM: a(i) = b(i) + c(i) 24 1
TRIAD: a(i) = b(i) + q*c(i) 24 2
------------------------------------------
These operations are representative of the ``building blocks'' of long vector operations. The array sizes are defined so that each array is larger than the cache of the machine to be tested, and the code is structured so that data re-use is not possible.