On May 18, 2011, at 10:08 AM, Henning Sauerland wrote: > > On 15.05.2011, at 15:59, Jed Brown wrote: > >> This is a problem, but you can still order unknowns in the vector so that >> velocity and pressure all come together, then AIJ/Inode will treat the >> components together which will tend to make ILU stronger. > > The results using the interlaced ordering are more pronounced than expected. > The number of iterations did increase significantly using ILU(0) (~430 vs. > ~170 per Picard iteration on 4 PEs) which makes it 4-5 times slower.
So interlacing the variables makes ILU() much worse in both iteration count and time? Barry > However, the iteration count almost stays constant when moving to more > processors! ILU(2) again reduces the iteration count (~100) while being > slower compared to ILU(0). > > > I really appreciate your suggestions so far! > > Henning
