Hello, I am new using MPI. I want to run a simple program (I enclose the program) in 2 different computers. I have installed MPI in both computers. I have compiled the program using:
mpiCC -o PruebaSumaParalela.out PruebaSumaParalela.cpp I have copied the executable PruebaSumaParalela.out to my /home directoy in both computers. Then I run: mpirun -np 2 --host 10.4.5.123,edu@10.4.5.126 --prefix /usr/local ./PruebaSumaParalela.out The 10.4.5.123 computer prints: Inicio Inicio totalnodes:2 mynode:0 Inicio Recv totalnodes:2 mynode:1 Inicio Send sum:375250 The edu@10.4.5.126 computer prints: Inicio Inicio totalnodes:2 mynode:1 Inicio Send sum:375250 totalnodes:2 mynode:0 Inicio Recv But the program does not finish on any computer. It seems that the Send and Recv does not work. Master computer is waiting to receive something that the slave does not send. Do you know what the problem could be ? Thank you very much. Sofia No virus found in this outgoing message Checked by PC Tools AntiVirus (4.0.0.26 - 10.100.007). http://www.pctools.com/free-antivirus/
#include<iostream.h>
#include<mpi.h>
int main(int argc, char ** argv){
int mynode, totalnodes;
int sum,startval,endval,accum;
printf("Inicio\n");
MPI_Status status;
MPI_Init(&argc,&argv);
MPI_Comm_size(MPI_COMM_WORLD, &totalnodes);
MPI_Comm_rank(MPI_COMM_WORLD, &mynode);
printf("totalnodes: %d\n",totalnodes);
printf("mynode: %d\n",mynode);
sum = 0;
startval = 1000*mynode/totalnodes+1;
endval = 1000*(mynode+1)/totalnodes;
for(int i=startval;i<=endval;i=i+1)
sum = sum + i;
if(mynode!=0){
printf("Inicio Send\n");
printf("sum: %d\n",sum);
MPI_Send(&sum,1,MPI_INT,0,1,MPI_COMM_WORLD);
printf("Send sum\n");
}
else
for(int j=1;j<totalnodes;j=j+1){
printf("Inicio Recv\n");
MPI_Recv(&accum,1,MPI_INT,j,1,MPI_COMM_WORLD, &status);
printf("RECV accum\n");
sum = sum + accum;
printf("Sum\n");
}
printf("Final\n");
if(mynode == 0)
cout << "The sum from 1 to 1000 is: " << sum << endl;
MPI_Finalize();
}
