On Fri, 8 Nov 2013, at 14:08, Gryllida wrote: > > > On Fri, 8 Nov 2013, at 10:09, Svetlana Tkachenko wrote: > > ex2f.F involves a band matrix with 4 on main diagonal and -1s on the > > sub-diagonals. I have A_central matrix which stores the -4s, and A_left, > > A_right, Atop, A_bottom matrices which store the -1s (they actually are > > more complicated numbers than that). Would it be recommended to simply wrap > > the "do 10, II=..." block like the one in ex2f.F into $OMP DO to speed up > > filling of the matrix as each of the values set can be set independently of > > others? (I tried doing so but got a segmentation fault and I'm working on a > > small example to reproduce the problem.) > > > > Svetlana > > I figured out this is called 'stencils' correctly and corrected the subject. > Trying to use example ex22f.F but it's quite involved. > > Svetlana
Found http://scicomp.stackexchange.com/questions/2224/how-should-i-build-a-2d-5-point-stencil-laplacian-matrix-in-parallel/2228 and will try to follow Jed Brown's advice.
