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Rachit Prasad <[email protected]> writes:

> Thank You for the response. I have already set the pre-conditioner to
> PCILU. What should I do next? Try different pre-conditioners?

Yes.  You can (a) just try stuff, (b) search with an understanding of
methods and the problem you're trying to solve, or (c) consult the
literature for your class of problem and configure the solver based on a
paper that claims to work well.

You may find these tips useful.

https://scicomp.stackexchange.com/questions/513/why-is-my-iterative-linear-solver-not-converging?lq=1

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