On 2/12/19 6:01 AM, Bruno Blais wrote: > > The documentation suggest an atol between 1e-2 and 1e-5 and a rtol of > the order of 1.01. However, what should my ilu_fill and ilut_drop be? I > understand that increasing the fill will increase the memory consumption > and that I should try to reach a compromise, but right now I find that > it's mostly the speed of my iterative solve that is the problem. Are > there any guidelines to orient my choice of parameters? Am I going with > the right type of pre-conditioner or am I in the wrong here?
Others may have more experience with concrete values, but yours is a problem that is amendable to just trying things out: run the program for ten values for each of these parameters and plot the run-time for each run. That will give you an idea for how the behavior of the program depends on these values. Best W. -- ------------------------------------------------------------------------ Wolfgang Bangerth email: [email protected] www: http://www.math.colostate.edu/~bangerth/ -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
