Re: [mpich-discuss] MPI_Win RMA with threads

Hi Mark Davis, Sorry for the late response. I tried your program and it seems works fine -- prints out messages and have `--- SUCCESS ---` in the end. I was testing with MPICH version 3.3.1. Which version were you using? Hui Zhou On 2/27/20, 2:33 PM, "Mark Davis via discuss" <[email protected]> wrote: Please see the attached. You can run with something like mpic++ -std=c++17 -g -ggdb -fno-omit-frame-pointer -lpthread -O0 thread_test_2.cpp -o thread_test_2 && mpirun -n 2 thread_test_2 1 5 8 A follow-up question: it seems that MPICH creates a duplicate MPI_Comm for each window, as I mentioned above. Is that something that's enforced by the standard or just an MPICH implementation detail?