Definition
MPI_UNSIGNED_LONG is an MPI_Datatype that represents an unsigned long integer type in MPI, it corresponds to an unsigned long int in C.
Datatypes
C
MPI_UNSIGNED_LONG is an MPI_Datatype that represents an unsigned long integer type in MPI, it corresponds to an unsigned long int in C.
#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>
/**
* @brief Illustrate how to communicate a unsigned long int between 2 MPI
* processes.
* @details This application is meant to be run with 2 MPI processes: 1 sender
* and 1 receiver. The former sends a unsigned long int to the latter, which
* prints it.
**/
int main(int argc, char* argv[])
{
MPI_Init(&argc, &argv);
// Check that 2 MPI processes are used.
int size;
MPI_Comm_size(MPI_COMM_WORLD, &size);
if(size != 2)
{
printf("This application is meant to be run with 2 MPI processes.\n");
MPI_Abort(MPI_COMM_WORLD, EXIT_FAILURE);
}
// Get my rank and do the corresponding job.
enum role_ranks { SENDER, RECEIVER };
int my_rank;
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
switch(my_rank)
{
case SENDER:
{
// Send the unsigned long int
unsigned long int unsignedLongIntToSend = 12345;
printf("[MPI process %d] I send unsigned long int: %lu.\n", my_rank, unsignedLongIntToSend);
MPI_Ssend(&unsignedLongIntToSend, 1, MPI_UNSIGNED_LONG, RECEIVER, 0, MPI_COMM_WORLD);
break;
}
case RECEIVER:
{
// Receive the unsigned long int
unsigned long int unsignedLongIntReceived;
MPI_Recv(&unsignedLongIntReceived, 1, MPI_UNSIGNED_LONG, SENDER, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
printf("[MPI process %d] I received unsigned long int: %lu.\n", my_rank, unsignedLongIntReceived);
break;
}
}
MPI_Finalize();
return EXIT_SUCCESS;
}
#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>
/**
* @brief Illustrate how to communicate an array of unsigned long ints between 2
* MPI processes.
* @details This application is meant to be run with 2 MPI processes: 1 sender
* and 1 receiver. The former sends an array of unsigned long ints to the
* latter, which prints it.
**/
int main(int argc, char* argv[])
{
MPI_Init(&argc, &argv);
// Check that 2 MPI processes are used.
int size;
MPI_Comm_size(MPI_COMM_WORLD, &size);
if(size != 2)
{
printf("This application is meant to be run with 2 MPI processes.\n");
MPI_Abort(MPI_COMM_WORLD, EXIT_FAILURE);
}
// Get my rank and do the corresponding job.
enum role_ranks { SENDER, RECEIVER };
int my_rank;
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
switch(my_rank)
{
case SENDER:
{
// Send the unsigned long ints
unsigned long int unsignedLongIntsToSend[2] = { 12345, 67890 };
printf("[MPI process %d] I send unsigned long ints: %lu and %lu.\n", my_rank, unsignedLongIntsToSend[0], unsignedLongIntsToSend[1]);
MPI_Ssend(unsignedLongIntsToSend, 2, MPI_UNSIGNED_LONG, RECEIVER, 0, MPI_COMM_WORLD);
break;
}
case RECEIVER:
{
// Receive the unsigned long ints
unsigned long int unsignedLongIntsReceived[2];
MPI_Recv(unsignedLongIntsReceived, 2, MPI_UNSIGNED_LONG, SENDER, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
printf("[MPI process %d] I received unsigned long ints: %lu and %lu.\n", my_rank, unsignedLongIntsReceived[0], unsignedLongIntsReceived[1]);
break;
}
}
MPI_Finalize();
return EXIT_SUCCESS;
}