1 /* Copyright (c) 2012-2019. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
10 int main(int argc, char **argv)
16 int sendcount = 1; // one double to each process
18 double *sndbuf = NULL;
20 int root = 0; // arbitrary choice
22 MPI_Init(&argc, &argv);
23 MPI_Comm_size(MPI_COMM_WORLD, &size);
24 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
26 // on root, initialize sendbuf
28 sndbuf = malloc(size * sizeof(double));
29 for (int i = 0; i < size; i++) {
30 sndbuf[i] = (double) i;
34 retval = MPI_Scatter(sndbuf, sendcount, MPI_DOUBLE, NULL, recvcount, MPI_DOUBLE, root, MPI_COMM_WORLD);
35 if(retval!=MPI_ERR_BUFFER)
36 printf("MPI_Scatter did not return MPI_ERR_BUFFER for empty recvbuf\n");
37 retval = MPI_Scatter(sndbuf, sendcount, MPI_DOUBLE, &rcvd, -1, MPI_DOUBLE, root, MPI_COMM_WORLD);
38 if(retval!=MPI_ERR_COUNT)
39 printf("MPI_Scatter did not return MPI_ERR_COUNT for -1 recvcount\n");
40 retval = MPI_Scatter(sndbuf, sendcount, MPI_DOUBLE, &rcvd, recvcount, MPI_DATATYPE_NULL, root, MPI_COMM_WORLD);
41 if(retval!=MPI_ERR_TYPE)
42 printf("MPI_Scatter did not return MPI_ERR_TYPE for MPI_DATATYPE_NULL sendtype\n");
43 retval = MPI_Scatter(sndbuf, sendcount, MPI_DOUBLE, &rcvd, recvcount, MPI_DOUBLE, -1, MPI_COMM_WORLD);
44 if(retval!=MPI_ERR_ROOT)
45 printf("MPI_Scatter did not return MPI_ERR_ROOT for root -1\n");
46 retval = MPI_Scatter(sndbuf, sendcount, MPI_DOUBLE, &rcvd, recvcount, MPI_DOUBLE, size+1, MPI_COMM_WORLD);
47 if(retval!=MPI_ERR_ROOT)
48 printf("MPI_Scatter did not return MPI_ERR_ROOT for root > size\n");
49 retval = MPI_Scatter(sndbuf, sendcount, MPI_DOUBLE, &rcvd, recvcount, MPI_DOUBLE, root, MPI_COMM_NULL);
50 if(retval!=MPI_ERR_COMM)
51 printf("MPI_Scatter did not return MPI_ERR_COMM for MPI_COMM_NULL comm\n");
53 retval = MPI_Scatter(sndbuf, sendcount, MPI_DOUBLE, &rcvd, recvcount, MPI_DOUBLE, root, MPI_COMM_WORLD);
57 if (retval != MPI_SUCCESS) {
58 fprintf(stderr, "(%s:%d) MPI_Scatter() returned retval=%d\n", __FILE__, __LINE__, retval);
62 if ((double) rank != rcvd) {
63 fprintf(stderr, "[%d] has %f instead of %d\n", rank, rcvd, rank);
68 printf("** Small Test Result: ...\n");
70 printf("\t[%d] failed.\n", rank);
72 printf("\t[%d] ok.\n", rank);