[mpich-discuss] Send/Recv Array of Numbers

[Reuti]

Hi,

Am 04.05.2012 um 17:01 schrieb Mis Nat:

> I'm trying to send random numbers in array which are generated in process 0 to process 1. I'm running in circles and I can't find out why process 1 receive only 6 of 10 numbers? Can please someone give me any advice what I'm doing wrong? 

I wonder why the first ones are correct at all. For rank 1 you never allocate any memory AFAICS for the array. Allocating it  for rank 1 too should fix it.

-- Reuti


> Thank you!
> 
> Best regards,
> 
> Nat
> 
> 
> void Test(int *Array, int ArraySize, int rank, int size)
> {	
> 	int n=0;
> 	MPI_Status status;
> 
> 	if (rank == 0)
> 	 {
> 		 MPI_Send(Array, ArraySize, MPI_INT, 1, 0, MPI_COMM_WORLD);
> 	 }
> 	 else if (rank == 1)
> 	 {
> 		printf("\nReceiving:\n");
> 		MPI_Recv(Array,  ArraySize, MPI_INT, 0, 0, MPI_COMM_WORLD, &status);	
> 
> 		for (n=0; n<=ArraySize; n++)
> 			printf("Proces %d array[%d]: %d \n", rank, n, Array[n]);
> 	 }			
> }
> 
> int main(int argc, char *argv[])
> {	
>     int ArraySize;
>     int *Array;
>     int MyRank, npes;
>     int n=0;
> 
>     MPI_Status status;
>     MPI_Init(&argc,&argv);
> 
>     MPI_Comm_rank(MPI_COMM_WORLD,&MyRank);
>     MPI_Comm_size(MPI_COMM_WORLD,&npes);
> 
>     if(MyRank==0)
>     {
>         ArraySize=10;
>         Array=(int *)malloc(ArraySize*sizeof(int));
> 
>         if(Array==0)
>             printf("Malloc memory error!");
> 
>         srand(time(NULL));
>         for(n=0;n<ArraySize;n++)
>         {
>             Array[n]=(int)rand()%1000;
>             printf("%d ",Array[n]);
>         }
>         printf("\n");
>     }
> 
> MPI_Bcast(&ArraySize,1,MPI_INT,0,MPI_COMM_WORLD);
> Test(Array,ArraySize, MyRank, npes);
> 
> 	MPI_Finalize();
> 	return 0;	
> }
> 
> 
> OUTPUT:
> D:\examples\Release>mpiexec -n 2 -machinefile mf.txt -path "D:\examples\Release"
>  Sortiranje.exe
> 4 359 104 338 565 244 132 891 450 557
> ☺  5☻  ˘   äProces 1 array[0]: 4
> Proces 1 array[1]: 359
> Proces 1 array[2]: 104
> Proces 1 array[3]: 338
> Proces 1 array[4]: 565
> Proces 1 array[5]: 244
> Proces 1 array[6]: 1869762692
> Proces 1 array[7]: 544433507
> Proces 1 array[8]: 1918967857
> Proces 1 array[9]: 1534681458
> Proces 1 array[10]: 540695856
> 
> 
> 
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