1 /* Copyright (c) 2009-2012. The SimGrid Team. All rights reserved. */
3 /* This example should be instructive to learn about SMPI_SAMPLE_LOCAL and
4 SMPI_SAMPLE_GLOBAL macros for execution sampling */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
14 void* hash(char *str, uint64_t* ans);
16 void* hash(char *str, uint64_t* ans)
20 printf("hashing !\n");
21 while ((c = *str++)!=0)
22 *ans = ((*ans << 5) + *ans) + c; /* hash * 33 + c */
27 int main(int argc, char *argv[])
29 MPI_Init(&argc, &argv);
31 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
32 MPI_Comm_size(MPI_COMM_WORLD, &size);
33 //Let's Allocate a shared memory buffer
34 uint64_t* buf = SMPI_SHARED_MALLOC(sizeof(uint64_t));
35 //one writes data in it
40 MPI_Barrier(MPI_COMM_WORLD);
41 //everyobne reads from it.
42 printf("[%d] The value in the shared buffer is: %" PRIu64"\n", rank, *buf);
45 MPI_Barrier(MPI_COMM_WORLD);
46 //Try SMPI_SHARED_CALL function, which should call hash only once and for all.
47 char *str = strdup("onceandforall");
49 SMPI_SHARED_CALL(hash,str,str,buf);
52 MPI_Barrier(MPI_COMM_WORLD);
54 printf("[%d] After change, the value in the shared buffer is: %" PRIu64"\n", rank, *buf);
56 SMPI_SHARED_FREE(buf);