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Q8_AllGatherV.c
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Q8_AllGatherV.c
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#include <mpi.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
srand(time(0));
int n = rand() % 5 + 1;
int rank = -1;
int nprocs = 0;
MPI_Init(&argc, &argv);
MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Request request = MPI_REQUEST_NULL;
MPI_Request master_request = MPI_REQUEST_NULL;
MPI_Status status;
MPI_Status master_status;
int master_message_size = 0;
char Meg_T[30] = " ";
char Return_Data[30] = " ";
int CheckPoint = 0;
if (rank == 0)
{
for(int fill=0; fill<30; fill++){
Meg_T[fill] = '-';
}
int next_start = 0;
for(int val=1; val<nprocs; val++)
{
int number_amount;
MPI_Status status;
MPI_Probe(val, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
MPI_Get_count(&status, MPI_CHAR, &number_amount);
char *rdata = (char*)malloc(sizeof(char) * number_amount);
MPI_Irecv(rdata, number_amount, MPI_CHAR, val, MPI_ANY_TAG, MPI_COMM_WORLD, &request);
MPI_Wait(&request,&status);
int idx;
printf("Enter Index No. to Append Process %d\n Message in Process (Between %d-30): ", val, next_start);
scanf("%d", &next_start);
int t = next_start;
for(int itr=0; itr<number_amount; itr++){
if(rdata[itr]==0){
break;
}
Meg_T[t] = rdata[itr];
t++;
}
if(rank==0){
printf("\nProcess %d Received From %d: %s\n", rank, val, rdata);
printf("------------------------------\n");
}
}
printf("\nTotal Message Received: ");
for(int arr=0; arr<(30); arr++){
if(Meg_T[arr]!=0){
master_message_size++;
}
printf("%c", Meg_T[arr]);
}
printf("\n");
printf("\n======================================================\n\n");
printf("Sending To All Process of Size: %d\n", master_message_size);
for(int val=1; val<nprocs; val++)
{
MPI_Isend(&Meg_T, 30, MPI_CHAR, val, n, MPI_COMM_WORLD, &master_request);
}
}else if (rank>0){
int send_size = n;
char arr[send_size];
for(int i=0; i<send_size; i++){
arr[i] = 'A'+i;
}
MPI_Isend(&arr, send_size, MPI_CHAR, 0, n, MPI_COMM_WORLD, &request);
MPI_Irecv(&Return_Data, 30, MPI_CHAR, 0, MPI_ANY_TAG, MPI_COMM_WORLD, &master_request);
}
MPI_Wait(&master_request, &master_status);
if(rank>0){
printf("Message Received By Process %d: ", rank);
for(int arr=0; arr<(30); arr++){
printf("%c", Return_Data[arr]);
}
printf("\n");
}
MPI_Finalize();
return 0;
}