[petsc-dev] VecScatterBegin_1 with zero sized vectors and PETSC_HAVE_CUSP

[Stefano Zampini]

Hi recently installed petsc-dev on a GPU cluster. I got an error in
external library CUSP when calling PCISSetup: more precisely, doing
VecScatterBegin on SEQ (not SEQCUSP!) vectors (please see the traceback
attached). I'm developing the BDDC preconditioner code inside PETSc and
this error occurred when doing multilevel: in such case some procs (like
proc 17 in the case attached) has local  dimension (relevant to PCIS) equal
to zero.

Thus, I think the real problem stays on line 41 of
src/vec/vec/utils/vpscat.h. If you tell me the reason why you used the
first condition on the if clause I can patch the problem.

Regards,
-- 
Stefano
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