[petsc-users] Obtain the precondioned matrix

[我]

Hi all,
I want to analyze the preconditioned matrix. But the KSPComputeExplicitOperator costs too much time to obtain the matrix. My origin matrix is about 3000*3000 sparse one. I noticed this function is applicable for the relative small system. What's the matrix-size limitation for this function? And for my case, any suggestions to solve it with less time?
Thank you very much!
daye
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