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Adding some Python (mpi4py) material
m (More Fortran updates) |
m (Adding some Python (mpi4py) material) |
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== MPI Programming Basics == <!--T:13--> | == MPI Programming Basics == <!--T:13--> | ||
This tutorial will present the development of an MPI code in C and | This tutorial will present the development of an MPI code in C, C++, Fortran, and Python, but the concepts apply to any language for which MPI bindings exist. For simplicity our goal will be to parallelize the venerable "Hello, World!" program, which appears below for reference. | ||
</translate> | </translate> | ||
<tabs> | <tabs> | ||
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end program hello | end program hello | ||
}} | |||
</tab> | |||
<tab name="Python"> | |||
{{File | |||
|name=hello.py | |||
|lang="python" | |||
|contents= | |||
print('Hello, world!') | |||
}} | }} | ||
</tab> | </tab> | ||
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* C language wrapper: <tt>mpicc</tt> | * C language wrapper: <tt>mpicc</tt> | ||
* Fortran: <tt>mpifort</tt> (recommended) or <tt>mpif90</tt> | * Fortran: <tt>mpifort</tt> (recommended) or <tt>mpif90</tt> | ||
* C++: <tt>mpiCC</tt> | * C++: <tt>mpiCC</tt> or <tt>mpicxx</tt> | ||
<!--T:19--> | <!--T:19--> | ||
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end program phello0 | end program phello0 | ||
}} | }} | ||
</tab></tabs> | </tab> | ||
<tab name="Python (mpi4py)"> | |||
{{File | |||
|name=phello0.py | |||
|lang="python" | |||
|contents= | |||
from mpi4py import MPI | |||
print('Hello, world!') | |||
}} | |||
</tab> | |||
</tabs> | |||
<translate> | <translate> | ||
=== Rank and Size === <!--T:23--> | === Rank and Size === <!--T:23--> | ||
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end program phello1 | end program phello1 | ||
}} | |||
</tab> | |||
<tab name="Python (mpi4py)"> | |||
{{File | |||
|name=phello1.py | |||
|lang="python" | |||
|contents= | |||
from mpi4py import MPI | |||
comm = MPI.COMM_WORLD | |||
size = comm.Get_size() | |||
rank = comm.Get_rank() | |||
print('Hello from process %d of %d'%(rank, size)) | |||
}} | }} | ||
</tab> | </tab> | ||
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If you are using the Boost version, you should compile with: | If you are using the Boost version, you should compile with: | ||
[~]$ mpic++ --std=c++11 phello1.cpp -lboost_mpi-mt -lboost_serialization-mt -o phello1 | [~]$ mpic++ --std=c++11 phello1.cpp -lboost_mpi-mt -lboost_serialization-mt -o phello1 | ||
If you are using the Python version, you don't need to compile but can run with: | |||
[~]$ mpirun -np 4 python phello1.py | |||
=== Communication === <!--T:28--> | === Communication === <!--T:28--> | ||