[petsc-users] Scattering for DM objects

[Sun, Hui]

I have a DM MPI Vec u, I want to scatter it to a sequential Vec w in processor 0. There is a function VecScatterCreateToZero allowing me to do that. However, the global indices get easily messed up if I do this way.

So I have to match the IS for u and w. And I think maybe I can use DMCompositeGetGlobalISs to get the IS, and then call VecScatterCreate(u,is[0],w,is[0],&ctx).

But I'm not sure if I'm doing the right thing, and for now it gives me segmentation fault, memory errors on DMCompositeGetGlobalISs.

So I need some help on this.

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