Khai Hong Pham <[email protected]> writes: > Thank you for your information, Matt. I'm using both nested matrix and > nested vector. Is the nested vector good to use ?
VecNest is far worse than MatNest. Do not use it under any circumstances. Less than 1% of people that think they have run out of options and absolutely must use VecNest have any business using it. Always make your code work without MatNest first. Check that the answers make sense, then profile to see where memory and time is spent. If you are preconditioning with fieldsplit and excessive memory and time is spent in MatGetSubMatrix(), use -prefix_mat_type nest as an optimization.
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