Arpack Solver

exciting has an alternative solver from the ARPACK library. It finds the eigenvectors by inverse iterations. The algorithm has the advantage to perform better with multiple threads then the standard solver. In order to benefit from the multithreaded algorithms one cannot use the packed matrix matrix format.

To configure it put this solver element into the groundstate tag:

    <solver packedmatrixstorage="false" type="Arpack"/>
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