73 lines
2.6 KiB
C++
73 lines
2.6 KiB
C++
#include <iostream>
|
|
#include <vector>
|
|
#include <mpi.h>
|
|
#include <unistd.h> // Required for gethostname() and getpid()
|
|
#include <cstdlib> // Required for getenv()
|
|
|
|
int main(int argc, char** argv) {
|
|
MPI_Init(&argc, &argv);
|
|
|
|
int world_size;
|
|
MPI_Comm_size(MPI_COMM_WORLD, &world_size);
|
|
|
|
int world_rank;
|
|
MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);
|
|
|
|
// This will now get the unique Container ID, e.g., "039f5fe4970d"
|
|
char container_id[256];
|
|
gethostname(container_id, sizeof(container_id));
|
|
|
|
// This gets the friendly name from the environment variable we set
|
|
const char* friendly_name = getenv("FRIENDLY_NAME");
|
|
if (friendly_name == nullptr) {
|
|
friendly_name = "unknown"; // A fallback in case the variable isn't set
|
|
}
|
|
|
|
pid_t pid = getpid();
|
|
int num_workers = world_size - 1;
|
|
|
|
if (world_rank == 0) {
|
|
// --- MASTER PROCESS ---
|
|
int data[] = {1, 2, 3, 4};
|
|
// ... (error checking code is the same) ...
|
|
|
|
// Updated print statement with all information
|
|
std::cout << "Master on " << friendly_name << " (ID: " << container_id << ", PID: " << pid
|
|
<< ", rank: 0): sending numbers 1,2,3,4 to workers..." << std::endl;
|
|
|
|
for (int i = 0; i < num_workers; ++i) {
|
|
MPI_Send(&data[i], 1, MPI_INT, i + 1, 0, MPI_COMM_WORLD);
|
|
}
|
|
|
|
std::vector<int> results(num_workers);
|
|
for (int i = 0; i < num_workers; ++i) {
|
|
int received_result;
|
|
MPI_Recv(&received_result, 1, MPI_INT, i + 1, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
|
|
results[i] = received_result;
|
|
}
|
|
|
|
std::cout << "Master on " << friendly_name << " (ID: " << container_id << ", PID: " << pid
|
|
<< ", rank: 0): collected results {";
|
|
for (int i = 0; i < results.size(); ++i) {
|
|
std::cout << results[i] << (i == results.size() - 1 ? "" : ",");
|
|
}
|
|
std::cout << "}" << std::endl;
|
|
|
|
} else {
|
|
// --- WORKER PROCESSES ---
|
|
int received_number;
|
|
MPI_Recv(&received_number, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
|
|
|
|
int computed_result = received_number * 10;
|
|
|
|
// Updated print statement with all information
|
|
std::cout << "Worker on " << friendly_name << " (ID: " << container_id << ", PID: " << pid
|
|
<< ", rank: " << world_rank << "): received " << received_number
|
|
<< ", computed " << computed_result << std::endl;
|
|
|
|
MPI_Send(&computed_result, 1, MPI_INT, 0, 0, MPI_COMM_WORLD);
|
|
}
|
|
|
|
MPI_Finalize();
|
|
return 0;
|
|
} |