Hi Zhifeng,

You have to always execute the MPI program by using mpirun or mpiexec with -np <number of processes>.

At MPI_Init, the process tries to read information (e.g., MPI rank, number of processes) from the PMI server which is another process launched by the mpiexec command. This information is necessary for MPI library to initialize communication (e.g., connecting two processes).

Best regards,
Min

On 2018/11/04 10:27, Zhifeng Yang via discuss wrote:

Hi

After I installed mpich and used it in a FORTRAN code. There is an error while running this FORTRAN code called real.exe by using the following command

$./real.exe

or

$mpirun ./real.exe

real.exe: error: _get_addr: No such file or directory

real.exe: error: _get_addr: No such file or directory

real.exe: error: _get_addr: No such file or directory

Fatal error in MPI_Init: Other MPI error, error stack:

MPIR_Init_thread(784).....:

MPID_Init(1323)...........: channel initialization failed

MPIDI_CH3_Init(120).......:

MPID_nem_init_ckpt(852)...:

MPIDI_CH3I_Seg_commit(364): PMI_Barrier returned -1

But while using mpirun with specifying number of processors. as follows

$mpirun -np 1 ./real.exe

There is no error any more. I am not sure why? do you have any explanation? Thank you very much

Best regards

Zhifeng
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