How different are the values in b? Can you send back a few examples of the different b’s? Any idea of the condition number of C?
Barry On Jun 25, 2014, at 3:10 PM, Arthur Kurlej <[email protected]> wrote: > Hi all, > > While running my code, I have found that MatMult() returns different values > depending on the number of processors I use (and there is quite the variance > in the values). > > The setup of my code is as follows (I can go into more depth/background if > needed): > -Generate parallel AIJ matrix of size NxN, denoted as A > -Retrieve parallel AIJ submatrix from the last N-1 rows&columns from A, > denoted as C > -Generate vector of length N-1, denoted as x > -Find C*x=b > > I have already checked that A, C, and x are all equivalent when ran for any > number of processors, it is only the values of vector b that varies. > > Does anyone have an idea about what's going on? > > > Thanks, > Arthur >
