I am working on step 20 in deal.
I believe that the schur inverse calls op_M_inv multiple times is that correct?
How can I know how many times the inversion of M is done in that case? I tried to write a wrapper but couldn't do it myself.

I know you've already solved your problem, but because this is generally useful, I documented how I would approach your question here:
https://github.com/dealii/dealii/pull/16294/commits/6c0cd4894183967bad6a37f6a2764e3197448038

Best
 W.

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Wolfgang Bangerth          email:                 [email protected]
                           www: http://www.math.colostate.edu/~bangerth/


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