Difference between revisions of "MPI"
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| − | MPI is | + | MPI is an open standard for Distributed Memory [[Parallel_Programming|parallelization]]. Information on how to run an existing MPI program can be found in the [[How_to_Use_MPI]] Section. |
== General == | == General == | ||
| − | In MPI the | + | In MPI the most essential operations are: |
| + | * <code>MPI_Send</code> for sending a message | ||
<syntaxhighlight lang="c"> | <syntaxhighlight lang="c"> | ||
int MPI_Send (void* buf, int count, MPI_Datatype datatype, int dest, int tag, MPI_Comm comm) | int MPI_Send (void* buf, int count, MPI_Datatype datatype, int dest, int tag, MPI_Comm comm) | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| − | + | * <code>MPI_Recv</code> for receiving a message | |
<syntaxhighlight lang="c"> | <syntaxhighlight lang="c"> | ||
int MPI_Recv (void* buf, int count, MPI_Datatype datatype, int source, int tag, MPI_Comm comm, MPI_Status* status) | int MPI_Recv (void* buf, int count, MPI_Datatype datatype, int source, int tag, MPI_Comm comm, MPI_Status* status) | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| − | + | Although there a 100+ MPI functions defined in the standard (e.g. for non-blocking or collective communication, see the [[#References]] for more details), you can write meaningful MPI application with less than 20 of those. Programs written with these functions have to be compiled with a specific [[compiler]] (options) and executed with a special startup program like detailed [[How_to_Use_MPI|here]]. | |
Please check the more detailed tutorials in the References. | Please check the more detailed tutorials in the References. | ||
Revision as of 12:50, 13 April 2018
MPI is an open standard for Distributed Memory parallelization. Information on how to run an existing MPI program can be found in the How_to_Use_MPI Section.
General
In MPI the most essential operations are:
MPI_Sendfor sending a message
int MPI_Send (void* buf, int count, MPI_Datatype datatype, int dest, int tag, MPI_Comm comm)
MPI_Recvfor receiving a message
int MPI_Recv (void* buf, int count, MPI_Datatype datatype, int source, int tag, MPI_Comm comm, MPI_Status* status)
Although there a 100+ MPI functions defined in the standard (e.g. for non-blocking or collective communication, see the #References for more details), you can write meaningful MPI application with less than 20 of those. Programs written with these functions have to be compiled with a specific compiler (options) and executed with a special startup program like detailed here.
Please check the more detailed tutorials in the References.
References
Introduction to MPI from PPCES (@RWTH Aachen) Part 1