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Additional info for Curso práctico del Linux (parte 2)

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500 al proceso 1, elementos con ndices 501 .. 750 al proceso 2 y elementos con ndices 751 .. 250). Los otros procesos empiezan a sumar sus elementos independientemente. En el momento en el que un proceso ha realizado su suma, se lo comunica al proceso 0 y le manda el resultado de la suma. El proceso 0 se encarga de sumar su resultado con los resultados de los demas procesos para hallar la suma total. Notas: 7 ORDENADORES DE ALTO RENDIMIENTO CON LINUX 46 En la practica habr a que comprobar si nuestro programa es de verdad mas rapido en cuatro ordenadores que en uno.

Tambien hay que cambiar el owner de estos cheros. El comando find puede ser usado para encontrar todos los cheros de un usuario, usandolo desde el directorio principal en la forma find / -uid nnn. > Como podr amos combinar los comandos find y chown para cambiar el owner de todos los cheros de un usuario con una l nea de comando ? find / -uid nnn -exec chown mmm:kkk {} \ Ahora hay que cambiar los UID de los usuarios en los clientes, editando el chero /etc/passwd. es(rw) Ahora hay que asegurar que el servidor arranque los demonios que se encargaran de servir los cheros a los clientes.

I Notas: ln N 7 ORDENADORES DE ALTO RENDIMIENTO CON LINUX 49 Para paralelizar este codigo tenemos que considerar: Que la salida y la entrada de datos solo se realiza en un nodo. Que podemos realizar la suma en nodes trozos Que solo hay que comunicar la variable NMAX y los resultados de las sumas entre los nodos. le. 57721566490153286060' etime = MPI_WTIME() WRITE(*,*) 'wall clock:',etime-stime ENDIF Exit point call MPI_FINALIZE(rc) END 7 ORDENADORES DE ALTO RENDIMIENTO CON LINUX 51 A la hora de ejecutar el programa con el MPI, el MPI crea una copia del codigo y lo ejecuta en cada nodo del cluster.

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Curso práctico del Linux (parte 2) by Denk P.


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