ReThis is an interesting paper addressing an important problem.
It is clearly written.
I was not convinced by the particular applications chosen --
matrix multiplication and full matrix jacobi Iteration are
hardly central computational science applications. i think
some of the motivating examples in the beginning were
much more to the point -- remote data and visualization
are very clear cases.
Further how does this work compare to that used in Akamai
and other commercial situations -- as the Author's say this
basic issue stretches from commercial to technical computing.
So although this paper is not the "answer" it is a useful
well written contribution. I recommend publication after
some discussion of issues such as those raised above.