FAQ 000065 | Which matrix solver method should I use, direct and iterative?

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10/08/2019

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Question

Which matrix solver method should I use, direct and iterative?

Answer

The choice of the solver method leading quickly to results depends on the complexity of the model and the main memory (RAM) that is available:

  • For small and medium-size systems, the direct method is more effective.
  • For very large systems, the iterative method leads to results more quickly.
As soon as the matrices can no longer be accommodated in the main memory using the direct method, Windows begins to swap parts of the main memory to the hard disk. The hard disk activities will increase, and the processor load will be reduced, which is visible in the Windows Task Manager. By using the iterative ICG (Incomplete Conjugate Gradient) calculation method, you can avoid this storage problem.

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  • Updated 04/03/2020

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