P3M GPU fails with MPI

[KonradBreitsprecher]

mpirun -np 2 ./pypresso gpup3m_issue.py

goes down with

terminate called after throwing an instance of 'std::out_of_range'
  what():  _Map_base::at

Features: 'CUDA', 'ELECTROSTATICS', 'FFTW', 'H5MD', 'P3M'

Testscript:

import espressomd
from espressomd.electrostatics import P3M_GPU

S=espressomd.System()
S.time_step=0.01
S.cell_system.skin = 0.4

S.box_l=[10,10,10]

S.part.add(pos=[0,0,0], q=1)
S.part.add(pos=[0,0,2], q=-1)

p3m=P3M_GPU(bjerrum_length=1.0,accuracy=1e-4)
S.actors.add(p3m)

[fweik]

Funny enough

mpirun -np 2 ./pypresso ../testsuite/coulomb_cloud_wall.py

works. Will investigate.

[KonradBreitsprecher]

On the CD on 19/10, I will work on that.
#600, #658, #1361 and #239 are related.

[KonradBreitsprecher]

Closed via #1546