OPM/opm-autodiff — pull request #250 by dr-robertk (2014-12-02 14:01:43+00:00)
Title: Further performance improvement by avoiding zeros in matrix-matrix product.

This PR is based on top of #248 and simply avoids zero enries in the matrix-matrix multiplication.
However, the matrix structure is modified and this might not be wanted. On the other hand the speed up is significant (approx 40% for NORNE compared to master). The downside is a slightly higher number of iterations.
The results for SPE9 are the same. The max_iter has to be raised though.