Hi, I have a modified ROMIO library, but I have to compile the code using NERSC Hopper's default MPI compiler, is there any way to let the collective I/O code run with my modified ROMIO library. (and of course compile using their default mpicc) I try to compile my own mpicc and run on that cluster, but seems, the hopper cluster has specific optimized cray-mpi compiler and wont let my code compiled or executed correctly on compute nodes. Thanks, Jialin _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss