[CleverBoy]

Hello Everybody,

I am trying to use SU2 with mpich as SU2's webpage suggests. When configuring I am using the command below:

./meson.py build  -Denable-autodiff=true -Denable-pywrapper=true -Denable-mpp=true -Dwith-mpi=enabled -Dcustom-mpi=true -Dextra-deps=mpich -prefix=home/directory

and mpich is linked in my bash file as

export MPICC=/usr/bin/mpicc 
export MPICXX=/usr/bin/mpicxx
export CC=$MPICC
export CXX=$MPICXX

After the installation is completed, when I try to run a simulation I always get the following error:

Abort(70871301) on node 0: Fatal error in internal_Comm_rank: Invalid communicator, error stack:
internal_Comm_rank(30212): MPI_Comm_rank(comm=0x2feb8c20, rank=0x5bff1f33fc48) failed
internal_Comm_rank(30166): Invalid communicator

But if I use some default cc and c++ instead of mpich while compiling and use the same first command above for configuring I get no such error. mpirun works just fine that way.

The reason I am explaning this is I want to use Python Wrapper function so I can specify a custom inlet that comes with SU2v8.1. When I use regular cc and c++ for installation and do

import sys
import pysu2
import math
from mpi4py import MPI

def main():
  """
  Run the flow solver with a custom inlet (function of time and space).
  """
  
  comm = MPI.COMM_WORLD
  # comm = 0
.
.
.

for custom inlet python script it does not work and asks for mpi. Such as

Attempting to use an MPI routine (internal_Comm_rank) before initializing or after finalizing MPICH

How can I solve these series of problems? Am I missing something or is it this diffucult to use mpich? Because I run into different problems as well when I install mpich in a local directory. Would you recommend something else instead of mpich?

[Sakun]

Hi,

I had pretty much your issue and then i have found this video. It is really straight forward to follow.

https://www.youtube.com/watch?v=SOh6...c2tYF&index=39

Hope this helps,