Hello
After I did lam environment setup and successfully lamboot on my four node Rocks based cluster, I run some mpi applications under mpich example, such as cpi. Every time I run cpi, it can get the result properly, but I saw some warning message consistently after the result:
-----------------------------------------------------------------------------------------------
It seems that [at least] one of the processes that was started with mpirun did not invoke MPI_init before quitting (it is possbile that more than one process did not invoke MPI_INIT -- mpirun was only notified of the first one, which was no node n0).
MPIrun can *only* be used with mpi programs (i.e………………….)
------------------------------------------------------------------------------------------------
P0_25895: p4_error: semget failed for setnum:0 (This p4_error does not always happen, only some time. )
In addition, whenever I want to run linpack coming with '/opt/hpl/gnu/bin/xhpl' on four nodes ,
HPL.dat is like the following:
-----
-----
2 Ns
2 Ps
------
------
Then I used the following command to execute it:
# mpirun n0-3 -np 4 xhpl
I got error and no result can be achieved :
------------------------------------------------------------------------------------------------------------
HPL error from process # 0, on line 408 of function HPL_pdinfo:
>>>NEED at least 4 processes for these tests <<<
HPL error from process # 0, on line 408 of function HPL_pdinfo:
>>> Illegal input in file HPL.dat. Exiting … <<<
P0_25895: p4_error: semget failed for setnum:0
-------------------------------------------------------------------------------------------------------------
It seems that [at least] one of the processes that was started with mpirun did not invoke MPI_init before quitting (it is possbile that more than one process did not invoke MPI_INIT -- mpirun was only notified of the first one, which was no node n0).
MPIrun can *only* be used with mpi programs (i.e………………….)
-------------------------------------------------------------------------------------------------------------
From the command I run, it did included '-np 4'. Why did program still asked for: >>>NEED at least 4 processes for these tests <<<
But I can run Linpack on one node successfully under LAM with one process configuration in HPL.dat.
Also, mpirun under MPICH can run 4 nodes configuration Linpack without any issues.
Why did these two error happen? Can anybody give any suggestions?
Thanks