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| | *[[/Dell Cluster installation|Dell Cluster Installation]] | | *[[/Dell Cluster installation|Dell Cluster Installation]] |
| | *[[/MPI|Programmering med MPI]] | | *[[/MPI|Programmering med MPI]] |
| − | =Programmering med MPI=
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| − | http://www.lam-mpi.org/tutorials/one-step/ezstart.php
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| − | ==Geany IDE==
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| − | Der findes et IDE man kan tilrette til cluster kompilering og eksekvering kaldet geany.
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| − | Installation:
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| − | <pre>
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| − | aptitude install geany
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| − | </pre>
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| − | For at kompilere det med mpicc og eksekvere med mpiexec skal man lige rette lidt til under "Build > Set Includes and Arguments".
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| − | {|
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| − | |[[Image:Geany IDE.jpg|800px|left|thumb|Geany IDE]]
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| − | |}
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| − | <pre>mpicc -Wall "%f" -o "%e"
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| − |
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| − | mpiexec -n 20 -hostfile ~/mpd.hosts "%e"
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| − | </pre>
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| − | Og til C++ bruger man mpic++ -Wall "%f" -o "%e"<br/><br/>
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| − | Programmet man skriver skal selvfølgelig ligge i /var/mirror for de andre noder også har adgang til det.<br/><br/>
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| − | Og den kan man selvfølgelig X'e over med
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| − | <pre>
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| − | env DISPLAY=172.16.4.105:1 geany
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| − | </pre>
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| − |
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| − | ==Hello World eksempel==
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| − | HelloWorld program
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| − | <source lang=c>
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| − | #include "mpi.h"
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| − | #include <stdio.h>
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| − |
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| − | int main (int argc, char *argv[] )
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| − | {
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| − | int rank, size, namelen;
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| − | char processor_name[MPI_MAX_PROCESSOR_NAME];
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| − |
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| − |
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| − | MPI_Init( &argc, &argv );
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| − |
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| − | MPI_Get_processor_name( processor_name, &namelen );
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| − | MPI_Comm_rank( MPI_COMM_WORLD, &rank );
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| − | MPI_Comm_size( MPI_COMM_WORLD, &size );
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| − | printf( "Hello World from process %d, of %d on %s\n", rank, size, processor_name );
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| − | MPI_Finalize();
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| − | return 0;
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| − | }
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| − | </source>
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| − | Compile det med
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| − | <pre> mpicxx -o helloWorld helloWorld.c</pre>
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| − | og kør det med
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| − | <pre>mpiexec -n 10 /var/mirror/helloWorld</pre>
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| − | Resultatet skulle gerne blive
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| − | <pre>
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| − | Hello World from process 2, of 10 on C05
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| − | Hello World from process 6, of 10 on C05
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| − | Hello World from process 3, of 10 on C06
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| − | Hello World from process 1, of 10 on C04
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| − | Hello World from process 5, of 10 on C04
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| − | Hello World from process 7, of 10 on C06
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| − | Hello World from process 9, of 10 on C04
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| − | Hello World from process 0, of 10 on C01
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| − | Hello World from process 4, of 10 on C01
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| − | Hello World from process 8, of 10 on C01
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| − | </pre>
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| − | ==Hello World med MPI==
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| − | Det forrige eksempel brugte ikke rigtig MPI til noget, ud over at få rank og size.<br/>
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| − | Hvis vi skal lave det om til at rank 0 er den der printer til skærmen og alle de andre sender via MPI til den, ville det se sådan ud:
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| − | <source lang=c>
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| − | #include "mpi.h"
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| − | #include <stdio.h>
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| − | #include <string.h>
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| − |
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| − | int main (int argc, char *argv[] )
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| − | {
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| − | int rank, size, namelen, i;
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| − | char processor_name[MPI_MAX_PROCESSOR_NAME];
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| − | char greeting[MPI_MAX_PROCESSOR_NAME + 100];
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| − | MPI_Status status;
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| − |
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| − | MPI_Init( &argc, &argv );
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| − |
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| − | MPI_Get_processor_name( processor_name, &namelen );
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| − | MPI_Comm_rank( MPI_COMM_WORLD, &rank );
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| − | MPI_Comm_size( MPI_COMM_WORLD, &size );
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| − | sprintf( greeting, "Hello World from process %d, of %d on %s\n", rank, size, processor_name );
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| − |
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| − | if ( rank == 0 ) {
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| − | printf( "%s", greeting );
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| − | for (i = 1; i < size; i++ ) {
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| − | MPI_Recv( greeting, sizeof( greeting ), MPI_CHAR, i, 1, MPI_COMM_WORLD, &status );
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| − | printf( "%s", greeting );
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| − | }
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| − | }
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| − | else {
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| − | MPI_Send( greeting, strlen( greeting ) + 1, MPI_CHAR, 0, 1, MPI_COMM_WORLD );
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| − | }
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| − | MPI_Finalize();
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| − | return 0;
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| − | }
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| − | </source>
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| − | Hvilket returnenrer:
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| − | <pre>0: Hello World from process 0, of 10 on C01
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| − | 0: Hello World from process 1, of 10 on C04
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| − | 0: Hello World from process 2, of 10 on C05
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| − | 0: Hello World from process 3, of 10 on C06
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| − | 0: Hello World from process 4, of 10 on C01
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| − | 0: Hello World from process 5, of 10 on C04
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| − | 0: Hello World from process 6, of 10 on C05
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| − | 0: Hello World from process 7, of 10 on C06
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| − | 0: Hello World from process 8, of 10 on C01
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| − | 0: Hello World from process 9, of 10 on C04
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| − | </pre>
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| | =Slides= | | =Slides= |
| | *[http://mars.tekkom.dk/mediawiki/images/c/c3/PXE.pdf PXE] | | *[http://mars.tekkom.dk/mediawiki/images/c/c3/PXE.pdf PXE] |
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