[petsc-users] Trouble with ISEmbed

[TARDIEU Nicolas]

Dear PETSc Team,

I am trying to use IS embeding in parallel.
In order to (try to) understand how it works, I have built a simple example, attached to this email.

I consider a 20X20 matrix. The dof (u, p, t) in global numbering are the following :
u: 0..9     p: 10..14     t: 15..19

I have defined 4 IS to describe the dof  u, p, t and the agglomeration of u and p, called up.
I first extract the submatrix matrix(up,up), then  I would like to extract from it the (u,u) block.

The example runs OK in sequential but I do not obtain the (u,u) block on 2 processes.

I have a mistake in the build of the sub-IS but I cannot find it for days.

Best regards,
Nicolas
--
Nicolas Tardieu
Ing PhD Computational Mechanics
EDF - R&D Dpt ERMES
PARIS-SACLAY, FRANCE



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