main
test-branch
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Last change
on this file since bb03188 was ea777aa, checked in by Alex Wilton <awilton@…>, 3 years ago |
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Moved examples, include, build_default.properties, common.xml, and README out from dev.civl.com into the root of the repo.
git-svn-id: svn://vsl.cis.udel.edu/civl/trunk@5704 fb995dde-84ed-4084-dfe6-e5aef3e2452c
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Property mode
set to
100644
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File size:
651 bytes
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| 1 | /* Good broadcasts.
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| 2 | */
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| 3 | #include<mpi.h>
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| 4 | #include<assert.h>
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| 5 |
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| 6 | int nprocs;
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| 7 | int myrank;
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| 8 |
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| 9 | #define count 10
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| 10 |
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| 11 | void main() {
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| 12 | int argc;
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| 13 | char **argv;
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| 14 | double x[count];
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| 15 | double y[count];
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| 16 | int root;
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| 17 | int i;
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| 18 |
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| 19 | MPI_Init(&argc, &argv);
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| 20 | MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
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| 21 | MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
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| 22 | root = nprocs-1; // just to be different
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| 23 | for (i=0; i<count; i++)
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| 24 | x[i]=myrank;
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| 25 | MPI_Reduce(&x[0], &y[0], count, MPI_DOUBLE, MPI_SUM, root, MPI_COMM_WORLD);
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| 26 | for (i=0; i<count; i++)
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| 27 | assert(x[i]==myrank);
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| 28 | if (myrank == root) {
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| 29 | for (i=0; i<count; i++)
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| 30 | assert(y[i]==nprocs*(nprocs-1)/2);
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| 31 | }
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| 32 | MPI_Finalize();
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| 33 | }
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