MPI for Python Outline
Communicators
Point to Point Communication
Collective Operations Compute
Pi
Mandelbrot Set
Dynamic Process Management What is mpi4py?
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Full-featured Python bindings for MPI.
API based on the standard MPI-2 C++ bindings.
Almost all MPI calls are supported.
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targeted to MPI-2 implementations.
also works with MPI-1 implementations. Implementation
Implemented with Cython
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Code base far easier to write, maintain, and extend.
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Faster than other solutions (mixed Python and C codes).
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A pythonic API that runs at C speed ! Features – MPI-1
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Process groups and communication domains.
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Point to point communication.
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intracommunicators
intercommunicators
blocking (send/recv)
nonblocking (isend/irecv + test/wait)
Collective operations.
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Synchronization (barrier)
Communication (broadcast, scatter/gather)
Global reductions (reduce, scan) Features – MPI-2
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Dynamic process management (spawn, connect/accept).
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Parallel I/O (read/write).
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One sided operations, a.k.a. RMA (put/get/accumulate).
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Extended collective operations. Features – Python
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Communication of Python objects.
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high level and very convenient, based in pickle serialization
can be slow for large data (CPU and memory consuming)
