Difference between revisions of "Parallel job submission"
From ScientificComputing
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== Shared memory job (OpenMP) == | == Shared memory job (OpenMP) == | ||
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* In shared-memory parallel computing, multiple processors (or "threads") perform tasks independently but share a common global memory. If a processor modified an array in the memory, all other processors can see this update as well | * In shared-memory parallel computing, multiple processors (or "threads") perform tasks independently but share a common global memory. If a processor modified an array in the memory, all other processors can see this update as well | ||
* A serial code can be parallelized by marking code sections, which should be run in parallel, with [https://www.openmp.org/ openMP directives]. | * A serial code can be parallelized by marking code sections, which should be run in parallel, with [https://www.openmp.org/ openMP directives]. | ||
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== Distributed memory job (MPI) == | == Distributed memory job (MPI) == | ||
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* In distributed-memory parallel computing, multiple processors (or "cores") perform tasks independently while each processor possesses its own private memory resource. If a processor modify an array in its memory, this processor has to communicate to other processors so that the others see this update. | * In distributed-memory parallel computing, multiple processors (or "cores") perform tasks independently while each processor possesses its own private memory resource. If a processor modify an array in its memory, this processor has to communicate to other processors so that the others see this update. | ||
* Massage Passing Interface (MPI) library implements distributed memory parallel computing which can be programmed in C, C++ and Fortran | * Massage Passing Interface (MPI) library implements distributed memory parallel computing which can be programmed in C, C++ and Fortran | ||
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$ module load gcc/6.3.0 openmpi/4.0.2 | $ module load gcc/6.3.0 openmpi/4.0.2 | ||
$ bsub -n 240 mpirun ./program | $ bsub -n 240 mpirun ./program | ||
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Revision as of 14:29, 17 August 2021
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$ export OMP_NUM_THREADS=8 $ bsub -n 8 ./program |
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$ module load gcc/6.3.0 openmpi/4.0.2 $ bsub -n 240 mpirun ./program |
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