Fortran

[hard0822]

When I run the program, it always shows the following

"Abort(2663055) on node 0 (rank 0 in comm 0): Fatal error in PMPI_Init: Unknown error class, error stack:
MPIR_Init_thread(189).................:
MPID_Init(1580).......................:
MPIDI_SHMI_mpi_init_hook(27)..........:
MPIDI_POSIX_mpi_init_hook(165)........:
MPIDI_POSIX_eager_init_transport(2877):
MPIDU_Init_shm_alloc(151).............: unable to allocate shared memory”

Can you give me some advice

[Steve_Lionel]

You have an issue with MPI, not Fortran. If you are using Intel MPI, ask in Intel® MPI Library - Intel Community  In any case,. it's unlikely that anyone can help you by seeing only the error messages.