rb[i] = 0;
}
+ status = MPI_Allreduce(NULL, rb, size, MPI_UNSIGNED_LONG_LONG, MPI_SUM, MPI_COMM_WORLD);
+ if(status!=MPI_ERR_BUFFER)
+ printf("MPI_Allreduce did not return MPI_ERR_BUFFER for empty sendbuf\n");
+ status = MPI_Allreduce(sb, NULL, size, MPI_UNSIGNED_LONG_LONG, MPI_SUM, MPI_COMM_WORLD);
+ if(status!=MPI_ERR_BUFFER)
+ printf("MPI_Allreduce did not return MPI_ERR_BUFFER for empty recvbuf\n");
+ status = MPI_Allreduce(sb, rb, -1, MPI_UNSIGNED_LONG_LONG, MPI_SUM, MPI_COMM_WORLD);
+ if(status!=MPI_ERR_COUNT)
+ printf("MPI_Allreduce did not return MPI_ERR_COUNT for -1 count\n");
+ status = MPI_Allreduce(sb, rb, size, MPI_DATATYPE_NULL, MPI_SUM, MPI_COMM_WORLD);
+ if(status!=MPI_ERR_TYPE)
+ printf("MPI_Allreduce did not return MPI_ERR_TYPE for MPI_DATATYPE_NULL type\n");
+ status = MPI_Allreduce(sb, rb, size, MPI_UNSIGNED_LONG_LONG, MPI_OP_NULL, MPI_COMM_WORLD);
+ if(status!=MPI_ERR_OP)
+ printf("MPI_Allreduce did not return MPI_ERR_COMM for MPI_OP_NULL op\n");
+ status = MPI_Allreduce(sb, rb, size, MPI_UNSIGNED_LONG_LONG, MPI_SUM, MPI_COMM_NULL);
+ if(status!=MPI_ERR_COMM)
+ printf("MPI_Allreduce did not return MPI_ERR_COMM for MPI_COMM_NULL comm\n");
+
printf("[%d] sndbuf=[", rank);
for (i = 0; i < size *mult; i++)
printf("%d ", sb[i]);