1 /* Copyright (c) 2009-2013. 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. */
7 /* This example should be instructive to learn about SMPI_SAMPLE_LOCAL and
8 SMPI_SAMPLE_GLOBAL macros for execution sampling */
15 void* hash(char *str, uint64_t* ans);
17 void* hash(char *str, uint64_t* ans)
21 printf("hashing !\n");
22 while ((c = *str++)!=0)
23 *ans = ((*ans << 5) + *ans) + c; /* hash * 33 + c */
28 int main(int argc, char *argv[])
30 MPI_Init(&argc, &argv);
32 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
33 MPI_Comm_size(MPI_COMM_WORLD, &size);
34 //Let's Allocate a shared memory buffer
35 uint64_t* buf = SMPI_SHARED_MALLOC(sizeof(uint64_t));
36 //one writes data in it
41 MPI_Barrier(MPI_COMM_WORLD);
42 //everyobne reads from it.
43 printf("[%d] The value in the shared buffer is: %" PRIu64"\n", rank, *buf);
46 MPI_Barrier(MPI_COMM_WORLD);
47 //Try SMPI_SHARED_CALL function, which should call hash only once and for all.
48 char *str = strdup("onceandforall");
50 SMPI_SHARED_CALL(hash,str,str,buf);
53 MPI_Barrier(MPI_COMM_WORLD);
55 printf("[%d] After change, the value in the shared buffer is: %" PRIu64"\n", rank, *buf);
57 SMPI_SHARED_FREE(buf);