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. */
12 unsigned long hash(char *str);
14 unsigned long hash(char *str)
16 unsigned long hash = 5381;
18 printf("hashing !\n");
19 while ((c = *str++)!=0)
20 hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
25 int main(int argc, char *argv[])
27 MPI_Init(&argc, &argv);
29 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
30 MPI_Comm_size(MPI_COMM_WORLD, &size);
31 //Let's Allocate a shared memory buffer
32 unsigned long* buf = SMPI_SHARED_MALLOC(sizeof(unsigned long));
33 //one writes data in it
38 MPI_Barrier(MPI_COMM_WORLD);
39 //everyobne reads from it.
40 printf("[%d] The value in the shared buffer is: %lu\n", rank, *buf);
43 MPI_Barrier(MPI_COMM_WORLD);
44 //Try SMPI_SHARED_CALL function, which should call hash only once and for all.
45 char *str = strdup("onceandforall");
47 *buf=(unsigned long)SMPI_SHARED_CALL(hash,str,str);
50 MPI_Barrier(MPI_COMM_WORLD);
52 printf("[%d] After change, the value in the shared buffer is: %lu\n", rank, *buf);
55 SMPI_SHARED_FREE(buf);