attic/hpc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Binary Reduce funktioniert

Browse source
This commit is contained in:
Johannes Winklehner 2016-06-16 19:04:45 +02:00
parent ce7e11c41b
commit 5a844a56bd
2 changed files with 44 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

57
hpc_mpi/src/bin_reduce.c
View file

@ -6,6 +6,7 @@
*/
#include <stdio.h>
#include <string.h>
#include "mpi.h"
#include "bin_reduce.h"
@ -24,41 +25,69 @@ int Bin_Reduce(const void *sendbuf, void *recvbuf, int count,
return -1;
}
int r, p;
int r, p, size;
MPI_Status status;
MPI_Comm_rank(comm, &r);
MPI_Comm_size(comm, &p);
MPI_Type_size(datatype, &size);
int tree_depth = int_log2(p);
int tree_depth = int_log2(p) + 1;
int i = 0;
int depth;
int parent = 0;
// maximum possible number of nodes with current depth
int max_nodes = (1 << (tree_depth + 1)) - 1;
// maximum possible number of nodes in a subtree with current depth
int max_nodes = ((1 << tree_depth) - 1) / 2;
void *recv_left;
void *recv_right;
if (r == root) {
recv_right = recvbuf;
} else {
printf("%i gets some memory\n", r);
MPI_Alloc_mem(count * size, MPI_INFO_NULL, &recv_right);
}
for (depth = 1; i != r; depth++) {
parent = i;
max_nodes /= 2;
if (r > i + max_nodes) {
i += max_nodes + 1;
} else {
i++;
}
max_nodes /= 2;
}
printf("%i: %i\n", r, parent);
/*if (depth != tree_depth) {
MPI_Recv();
MPI_Reduce_local();
MPI_Recv();
MPI_Reduce_local();
}
if (depth != tree_depth && r + 1 < p) {
MPI_Alloc_mem(count * size, MPI_INFO_NULL, &recv_left);
MPI_Recv(recv_left, count, datatype, r + 1, 0, comm, &status);
printf("%i received %i from %i\n", r, *((int*) recv_left), r + 1);
MPI_Reduce_local(sendbuf, recv_left, count, datatype, op);
printf("right child of %i: %i\n", r, r + max_nodes + 1);
if (r + max_nodes + 1 < p) {
MPI_Recv(recv_right, count, datatype, r + max_nodes + 1, 0, comm,
&status);
printf("%i received %i from %i\n", r, *((int*) recv_right),
r + max_nodes + 1);
MPI_Reduce_local(recv_left, recv_right, count, datatype, op);
} else {
memcpy(recv_right, recv_left, count * size);
}
if (r != root) {
MPI_Send();
}*/
MPI_Free_mem(recv_left);
} else {
memcpy(recv_right, sendbuf, count * size);
}
if (r != root) {
printf("%i sends %i to %i\n", r, *((int*) recv_right), parent);
MPI_Send(recv_right, count, datatype, parent, 0, comm);
MPI_Free_mem(recv_right);
}
return 0;
}

2
hpc_mpi/src/hpc_mpi.c
View file

@ -37,7 +37,7 @@ int main(int argc, char* argv[]) {
//Binom_Reduce(&a, &recv, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
if (my_rank == 0) {
//printf("%i\n", recv);
printf("%i\n", recv);
}
/* shut down MPI */
MPI_Finalize();