Changeset 5713 in /cluster/svnroot for bccd-ng/bw-institute/2016/day06/matmul/mpi.c

Timestamp:

May 26, 2016 9:06:37 PM (5 years ago)

Author:

skylar

Message:

this segfaults

File:

• bccd-ng/bw-institute/2016/day06/matmul/mpi.c (modified) (3 diffs)

bccd-ng/bw-institute/2016/day06/matmul/mpi.c

@@ -12 +12 @@
     unsigned int start_row,stop_row,stride;
     bool print;
-    struct matrix m1,m2,local_dst_m;
+    struct matrix m1,m2,local_dst_m,dst_m;
 
     MPI_Init(&argc,&argv);
@@ -74 +74 @@
         init_matrix(&m2,random_seeds);
 
-        // Declare and allocate full destination matrix
+        // Allocate full destination matrix on first rank
         // Will be populated via MPI_Gather
-        struct matrix dst_m;
         dst_m.rows = m1.rows;
         dst_m.cols = m2.cols;
@@ -135 +134 @@
 #endif
 
+    MPI_Gather(
+            &local_dst_m.matrix,
+            (local_dst_m.cols*local_dst_m.rows),
+            MPI_INT,
+            &dst_m.matrix,
+            (dst_m.cols*dst_m.rows),
+            MPI_INT,
+            FIRST_RANK,
+            MPI_COMM_WORLD
+            );
+
     MPI_Finalize();