Previously, if the problem occured on an MPI process with rank other
than zero the the logging would not seen (at least in the output
files). Now together with the previous commit the problem should be
logged together with the well name and calling method.
For multi segment well the underlying call to
MultisegmentWell::updateWellStateWithTarget (at least if
updateWellStateWithTHPTargetProd is called for a producer under thp
control) might throw as there might be a singular matrix during the
solve needed in MultisegmentWell::iterateWellEqWithControl.
Previously, if that happened then the MPI process where it happened would
stop the nonlinear iteration as failed and try with a chopped time
step. The others might go one with the current time step and we would
see MPI errors about truncated messages.
Now we communicate any exception happening during this part of
WellModel::updateAndCommunicate and all processes will stop the
nonlinear iteration as failed and chop the time step.
We are experiencing singular matrices when solving mulisegment wells
sometimes. In that case (here during
BlackoilModelEbos::assembleReservoir <-
BlackoilModelEbos::initialLinerization <-
BlackoilModelEbos:::nonlinearIterationNewton ) an exception is thrown
when updating the controls of a well.
The problem here is that this exception only happens on one
process. That one goes to the catch block in
NonLinearSolverEbos::step, marks the nonlinear solve as failed and
cuts the time step. The others move to the collective communication
below. Somehow and somewhen all end up in a non-matching collective
communication with different data types and we get an MPI Error that
the message was truncated.
Now all processes will throw, terminate the nonlinear solver and cut
the timestep as it should be.
at the early stage of computeWellRatesWithBhpIterations. The perforation rates are not updated,
and it is not sensible to update based on the inconsistent well rates and perforation rates.
Better to keep the original explicit quantities for better consistency.
Furthermore, it can be dangerous to update the explicit quantities based on the
irrelevant perforation rates, since the ratios can be very undesirable due to crossflow.
Using bool here is at least frowned upon. To be honest, I have no idea
what happens underneath here if we pass a bool. In contrast to other
pod types we do not associate it with a builtin type of MPI (not even
sure what to use). Hence we probably create a custom type for sending
and receiving. That should work. But I have no idea what will be used
for summation.
BTW: I am debugging a case that previously crashed and now suddenly
works and this seems to be the only relevant change I made in the
meantime.
Implement graphcoloring to expose rows in level sets that that can be
executed in parallel during the sparse triangular solves.
Add copy of A matrix that is reordered to ensure continuous memory reads
when traversing the matrix in level set order.
TODO: add number of threads available as constructor argument in DILU
