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Compilation and execution of a program (Fortran 90)
Fortran 90 language, parallel code (MPI)
The program SommeVecVecPAR.f90 performs the sum of the two vectors A and B. The result is put in C. Each step is performed on 2 processes. If the program runs on multiple cores, only two cores will actually be used.
Compilation of a program :
Definition of the environment : :
- definition of the environment :
module avail module load GCC/7.2.0/OpenMPI/3.0.0
- checking
mpifort -showme gfortran .....
Compilation :
mpifort -o SommeVecVecPAR.exe SommeVecVecPAR.f90
The binary file (executable) SommeVecVecPAR.exe has been generated.
Execution of the program:
Running on the build server:
mpirun -np 2 ./SommeVecVecPAR.exe
The result is displayed on the screen:
LES DEUX VECTEURS : A = 1 2 3 4 5 6 7 8 9 10 B = 9 8 7 6 5 4 3 2 1 0 LES DEUX VECTEURS LOCAUX : Je suis le proc 0 parmi 2 processus A local ( proc 0 ) = 1 2 3 4 5 B local ( proc 0 ) = 9 8 7 6 5 Je suis le proc 1 parmi 2 processus A local ( proc 1 ) = 6 7 8 9 10 B local ( proc 1 ) = 4 3 2 1 0 LE VECTEUR SOMME LOCAL : C local ( proc 1 ) = 10 10 10 10 10 C local ( proc 0 ) = 10 10 10 10 10 LE VECTEUR SOMME : C = 10 10 10 10 10 10 10 10 10 10
Running on the cluster:
We use a submission script batch.sh for the shell (or batch.csh ) to submit the job on compute clusters.
It is the submission script that configures the environment and then calls your binary (with its options, if any) on the execution node.
SGE → batch.sh → binaire
qsub batch.sh
Your job 336000 ("SommeVecVecPAR") has been submitted
qstat job-ID prior name user state submit/start at queue slots ja-task-ID ----------------------------------------------------------------------------------------------------------------- 336000 0.00000 SommeVecVecPAR Login qw 02/14/2018 10:53:51 2 qstat job-ID prior name user state submit/start at queue slots ja-task-ID ----------------------------------------------------------------------------------------------------------------- 336000 0.05000 SommeVecVecPAR Login r 02/14/2018 10:54:16 r410B_ib_test@r410lin57.ens-ly 2
The output of the screen (standard output) is redirected to the file SommeVecVecPAR.o336000
The error output (standard error) is redirected to the file SommeVecVecPAR.e336000.
cat SommeVecVecPAR.o336000 /home/ccalugar/Support/FormationPSMN/SommeVecVecPar LES DEUX VECTEURS : A = 1 2 3 4 5 6 7 8 9 10 B = 9 8 7 6 5 4 3 2 1 0 LES DEUX VECTEURS LOCAUX : Je suis le proc 0 parmi 2 processus A local ( proc 0 ) = 1 2 3 4 5 B local ( proc 0 ) = 9 8 7 6 5 LE VECTEUR SOMME LOCAL : C local ( proc 0 ) = 10 10 10 10 10 LE VECTEUR SOMME : C = 10 10 10 10 10 10 10 10 10 10 Je suis le proc 1 parmi 2 processus A local ( proc 1 ) = 6 7 8 9 10 B local ( proc 1 ) = 4 3 2 1 0 C local ( proc 1 ) = 10 10 10 10 10