mpi
Creazione e gestione dei processi
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Il processo master genera due processi di lavoro e sendbuf
ai lavoratori.
master.c
#include "mpi.h"
int main(int argc, char *argv[])
{
int n_spawns = 2;
MPI_Comm intercomm;
MPI_Init(&argc, &argv);
MPI_Comm_spawn("worker_program", MPI_ARGV_NULL, n_spawns, MPI_INFO_NULL, 0, MPI_COMM_SELF, &intercomm, MPI_ERRCODES_IGNORE);
int sendbuf[2] = {3, 5};
int recvbuf; // redundant for master.
MPI_Scatter(sendbuf, 1, MPI_INT, &recvbuf, 1, MPI_INT, MPI_ROOT, intercomm);
MPI_Finalize();
return 0;
}
worker.c
#include "mpi.h"
#include <stdio.h>
int main(int argc, char *argv[])
{
MPI_Init(&argc, &argv);
MPI_Comm intercomm;
MPI_Comm_get_parent(&intercomm);
int sendbuf[2]; // redundant for worker.
int recvbuf;
MPI_Scatter(sendbuf, 1, MPI_INT, &recvbuf, 1, MPI_INT, 0, intercomm);
printf("recvbuf = %d\n", recvbuf);
MPI_Finalize();
return 0;
}
Esecuzione
mpicc master.c -o master_program
mpicc worker.c -o worker_program
mpirun -n 1 master_program
Stabilire la connessione tra due applicazioni indipendenti
Il processo master genera applicazioni server e client con un singolo processo per ogni applicazione. Il server apre una porta e il client si connette a quella porta. Quindi il client invia i dati al server con MPI_Send
per verificare che la connessione sia stabilita.
master.c
#include "mpi.h"
int main(int argc, char *argv[])
{
MPI_Init(&argc, &argv);
MPI_Comm intercomm;
// Spawn two applications with a single process for each application.
// Server must be spawned before client otherwise the client will complain at MPI_Lookup_name().
MPI_Comm_spawn("server", MPI_ARGV_NULL, 1, MPI_INFO_NULL, 0, MPI_COMM_SELF, &intercomm, MPI_ERRCODES_IGNORE);
MPI_Comm_spawn("client", MPI_ARGV_NULL, 1, MPI_INFO_NULL, 0, MPI_COMM_SELF, &intercomm, MPI_ERRCODES_IGNORE);
MPI_Finalize();
return 0;
}
server.c
#include "mpi.h"
#include <stdio.h>
int main(int argc, char *argv[])
{
MPI_Init(&argc, &argv);
// Open port.
char port_name[MPI_MAX_PORT_NAME];
MPI_Open_port(MPI_INFO_NULL, port_name);
// Publish port name and accept client.
MPI_Comm client;
MPI_Publish_name("name", MPI_INFO_NULL, port_name);
MPI_Comm_accept(port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &client);
// Receive data from client.
int recvbuf;
MPI_Recv(&recvbuf, 1, MPI_INT, 0, 0, client, MPI_STATUS_IGNORE);
printf("recvbuf = %d\n", recvbuf);
MPI_Unpublish_name("name", MPI_INFO_NULL, port_name);
MPI_Finalize();
return 0;
}
client.c
#include "mpi.h"
int main(int argc, char *argv[])
{
MPI_Init(&argc, &argv);
// Look up for server's port name.
char port_name[MPI_MAX_PORT_NAME];
MPI_Lookup_name("name", MPI_INFO_NULL, port_name);
// Connect to server.
MPI_Comm server;
MPI_Comm_connect(port_name, MPI_INFO_NULL, 0, MPI_COMM_SELF, &server);
// Send data to server.
int sendbuf = 3;
MPI_Send(&sendbuf, 1, MPI_INT, 0, 0, server);
MPI_Finalize();
return 0;
}
Riga di comando
mpicc master.c -o master_program
mpicc server.c -o server
mpicc client.c -o client
mpirun -n 1 master_program
Modified text is an extract of the original Stack Overflow Documentation
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