> El 16/9/2015, a las 21:44, Xujun Zhao <[email protected]> escribió: > > The following is another test, which shows the outer iteration is 2, and > MatMult is performed 24 times. So it means the first outer iteration performs > 16, and the subsequent iterations performs 8. (24=16+8) > > What parameters can I tune to accelerate the convergence? Will changing ncv > work better? > The following nconv=1 and unconverged value, what do they mean? > > 2 EPS nconv=1 first unconverged value (error) 0.0140231 (1.32666590e-02) > > --->test: EPS solve results: > the eigenvalue: 0.009301 > Solution method: krylovschur > Number of iterations of the method: 2 > EPS converged reason : 2
2 outer iterations is very fast, your problem seems very easy. You can try changing ncv but I would bet you won’t get the result with much less than 24 MatMult’s. Just try. The monitor you are using shows the number of converged eigenvalues and the first non-converged Ritz value. Jose
