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MPI: Difference between revisions
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MPI is an open, non-proprietary standard so an MPI program can easily be ported to many different computers. Applications that use it can be run on a large number of processors at once, often with good efficiency (called "scalability"). And because memory is local to each process some aspects of debugging are simplified --- it isn't possible for one process to interfere with the memory of another, and if a program generates a segmentation fault the resulting core file can be processed by standard serial debugging tools. However, due to the need to manage communication and synchronization explicitly, MPI programs may appear more complex than programs written with tools that support implicit communication. Furthermore, in designing an MPI program one should take care to minimize communication overhead in order that it not overwhelm the speed-up gained from parallel computation. | MPI is an open, non-proprietary standard so an MPI program can easily be ported to many different computers. Applications that use it can be run on a large number of processors at once, often with good efficiency (called "scalability"). And because memory is local to each process some aspects of debugging are simplified --- it isn't possible for one process to interfere with the memory of another, and if a program generates a segmentation fault the resulting core file can be processed by standard serial debugging tools. However, due to the need to manage communication and synchronization explicitly, MPI programs may appear more complex than programs written with tools that support implicit communication. Furthermore, in designing an MPI program one should take care to minimize communication overhead in order that it not overwhelm the speed-up gained from parallel computation. | ||
In the following we will attempt to highlight a few of these issues and discuss strategies to deal with them. Suggested references are presented at the end of this tutorial and the reader is encouraged to consult them for additional information. | |||
== MPI Programming Basics == | == MPI Programming Basics == | ||