Definition
MPI_UNSIGNED_LONG_LONG is an MPI_Datatype that represents an unsigned long long integer type in MPI, it corresponds to an unsigned long long int in C.
Datatypes
C
MPI_UNSIGNED_LONG_LONG is an MPI_Datatype that represents an unsigned long long integer type in MPI, it corresponds to an unsigned long long int in C.
#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>
/**
* @brief Illustrate how to communicate a unsigned long 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 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 long int
unsigned long long int unsignedLongLongIntToSend = 12345;
printf("[MPI process %d] I send unsigned long long int: %llu.\n", my_rank, unsignedLongLongIntToSend);
MPI_Ssend(&unsignedLongLongIntToSend, 1, MPI_UNSIGNED_LONG_LONG, RECEIVER, 0, MPI_COMM_WORLD);
break;
}
case RECEIVER:
{
// Receive the unsigned long long int
unsigned long long int unsignedLongLongIntReceived;
MPI_Recv(&unsignedLongLongIntReceived, 1, MPI_UNSIGNED_LONG_LONG, SENDER, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
printf("[MPI process %d] I received unsigned long long int: %llu.\n", my_rank, unsignedLongLongIntReceived);
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 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 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 long ints
unsigned long long int unsignedLongLongIntsToSend[2] = { 12345, 67890 };
printf("[MPI process %d] I send unsigned long long ints: %llu and %llu.\n", my_rank, unsignedLongLongIntsToSend[0], unsignedLongLongIntsToSend[1]);
MPI_Ssend(unsignedLongLongIntsToSend, 2, MPI_UNSIGNED_LONG_LONG, RECEIVER, 0, MPI_COMM_WORLD);
break;
}
case RECEIVER:
{
// Receive the unsigned long ints
unsigned long long int unsignedLongLongIntsReceived[2];
MPI_Recv(unsignedLongLongIntsReceived, 2, MPI_UNSIGNED_LONG_LONG, SENDER, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
printf("[MPI process %d] I received unsigned long long ints: %llu and %llu.\n", my_rank, unsignedLongLongIntsReceived[0], unsignedLongLongIntsReceived[1]);
break;
}
}
MPI_Finalize();
return EXIT_SUCCESS;
}