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[Jérôme Duriez <question701231@xxxxxxxxxxxxxxxxxxxxx>]

Question #701231 on Yade changed:
https://answers.launchpad.net/yade/+question/701231

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hi,

This is not an error, it is just a warning (WARN) regarding the
estimation of time step which was here attempted through PWaveTimeStep
function. And this function needs spherical bodies to propose a time
step, and here, probably due to MPI usage (which I have no experience
of), spherical bodies can not be seen by PWaveTimeStep.

Maybe GlobalStiffnessTimeStepper could still do its job anyway (you can
check asking for O.dt, and verifying whether it is still stuck to 1 or
not). If not, you can also assign manually O.dt yourself.

Depending on the hardware you wanna use (and your exact simulations),
you may also consider using OpenMP parallel executions of YADE. To do
so, you just need to ask for e.g. yade -j2 vtkRecorderExample.py # to
run on 2 CPU cores, without a need for modifying scripts.

That could be a simpler way, in case you would use a limited number of
CPU cores anyway (?).

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