GPU parallelization error, ranks not equal to gpu number

[WillT]

Did try the solutions from this post when you had a similar problem?

Runtime error about 2d euler vortex example

Yes, if you run PyFR with a command something like mpiexec -n 4 pyfr run -b cuda ... that should do the trick. If you haven’t already it’s probably worth compiling MPI with the CUDA aware flag, see here for more details: Performance Tuning — Documentation