Changes between Initial Version and Version 1 of mpich/point_to_point/demo1

Timestamp:

Mar 28, 2008, 11:27:35 AM (16 years ago)

Author:

wade

Comment:

--

mpich/point_to_point/demo1

@@ +1 @@
+= 程式碼 =
+{{{
+/*
+ * 每個 node 將訊息傳送給 node 0，由，node 0 統一印出
+ */
+
+#include <stdio.h>
+#include <mpi.h>
+#include <string.h>
+
+main(int argc, char **argv)
+{
+  int myrank, i, numprocs;
+  char message[20];
+  MPI_Status status;
+  MPI_Init(&argc, &argv);
+  MPI_Comm_size(MPI_COMM_WORLD, &numprocs);
+  MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
+  if(myrank == 0)
+  {
+    printf("I am %d \n", myrank);
+    for(i = 1; i < (numprocs); i++)
+    {
+      MPI_Recv(message, 20, MPI_CHAR, i, 99, MPI_COMM_WORLD, &status);
+      printf(" I GOT %s \n", message);
+    }
+    printf("\n");
+  }
+  if(myrank != 0)
+  {
+    sprintf(message, "i am %d", myrank);
+    MPI_Send(message, 20, MPI_CHAR, 0, 99, MPI_COMM_WORLD);
+    printf("I am %d \n", myrank);
+    printf("I send '%s\n\n ", message);
+  }
+  MPI_Finalize();
+}
+
+結果：