Dear Praveen,
Called compress(VectorOperation::insert), but the element received
from a remote processor, value 3.343515457745695e-15, does not match
with the value -3.343515457745695e-15 on the owner processor 0
I dont understand why this error is triggered.
The error says that two processors have set the same vector entry to
different values. On a VectorOperation::insert operation, the vector
does not know which of the two conflicting values it should choose. This
should not happen. Can you describe what kind of function you pass to
the VectorTools::interpolate function? Given that the value is
relatively small, I assume this happens because two processors decide to
put the node location of a certain degree of freedom on a distance of
machine epsilon apart. Given that they create different meshes, they
will follow different paths down to a certain vertex along which they
might refine differently.
The reason the check fails is that we measure a relative distance
between the two entries 3.343515457745695e-15 and
-3.343515457745695e-15, which is of course O(1) and fails. Since I'm
hesitating to simply put an additional absolute check (what should
happen if 1e-15 is a big number and small numbers are 1e-30?), I would
try to get a global idea of the magnitude of expected entries in the
vector by computing an infinity norm. This is a debug section only, so
the cost is no problem. Any other idea?
Best,
Martin
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