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. */
13 unsigned long hash(char *str);
15 uint64_t hash(char *str)
19 printf("hashing !\n");
20 while ((c = *str++)!=0)
21 hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
26 int main(int argc, char *argv[])
28 MPI_Init(&argc, &argv);
30 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
31 MPI_Comm_size(MPI_COMM_WORLD, &size);
32 //Let's Allocate a shared memory buffer
33 uint64_t* buf = SMPI_SHARED_MALLOC(sizeof(uint64_t));
34 //one writes data in it
39 MPI_Barrier(MPI_COMM_WORLD);
40 //everyobne reads from it.
41 printf("[%d] The value in the shared buffer is: %zu\n", rank, *buf);
44 MPI_Barrier(MPI_COMM_WORLD);
45 //Try SMPI_SHARED_CALL function, which should call hash only once and for all.
46 char *str = strdup("onceandforall");
48 *buf=(uint64_t)SMPI_SHARED_CALL(hash,str,str);
51 MPI_Barrier(MPI_COMM_WORLD);
53 printf("[%d] After change, the value in the shared buffer is: %lu\n", rank, *buf);
56 SMPI_SHARED_FREE(buf);