1 #include "colls_private.h"
7 int smpi_coll_tuned_allgather_loosely_lr(void *sbuf, int scount,
8 MPI_Datatype stype, void *rbuf,
9 int rcount, MPI_Datatype rtype,
13 int tag = COLL_TAG_ALLGATHER;
14 int i, j, send_offset, recv_offset;
15 int intra_rank, inter_rank, inter_comm_size, intra_comm_size;
16 int inter_dst, inter_src;
18 comm_size = smpi_comm_size(comm);
19 rank = smpi_comm_rank(comm);
20 MPI_Aint rextent, sextent;
21 rextent = smpi_datatype_get_extent(rtype);
22 sextent = smpi_datatype_get_extent(stype);
23 MPI_Request inter_rrequest;
24 MPI_Request rrequest_array[128];
25 MPI_Request srequest_array[128];
26 MPI_Request inter_srequest_array[128];
29 int rrequest_count = 0;
30 int srequest_count = 0;
31 int inter_srequest_count = 0;
35 intra_rank = rank % NUM_CORE;
36 inter_rank = rank / NUM_CORE;
37 inter_comm_size = (comm_size + NUM_CORE - 1) / NUM_CORE;
38 intra_comm_size = NUM_CORE;
42 //copy corresponding message from sbuf to rbuf
43 recv_offset = rank * rextent * rcount;
44 smpi_mpi_sendrecv(sbuf, scount, stype, rank, tag,
45 (char *)rbuf + recv_offset, rcount, rtype, rank, tag, comm, &status);
48 int inter_send_offset, inter_recv_offset;
52 inter_srequest_count = 0;
54 for (i = 0; i < inter_comm_size; i++) {
56 // inter_communication
58 inter_dst = (rank + intra_comm_size) % comm_size;
59 inter_src = (rank - intra_comm_size + comm_size) % comm_size;
62 ((inter_rank - 1 - i +
63 inter_comm_size) % inter_comm_size) * intra_comm_size + intra_rank;
66 inter_comm_size) % inter_comm_size) * intra_comm_size + intra_rank;
68 inter_send_offset = dst_seg * sextent * scount;
69 inter_recv_offset = src_seg * rextent * rcount;
71 for (j = 0; j < intra_comm_size; j++) {
73 // inter communication
74 if (intra_rank == j) {
75 if (i != inter_comm_size - 1) {
77 inter_rrequest = smpi_mpi_irecv((char *)rbuf + inter_recv_offset, rcount, rtype,
78 inter_src, tag, comm);
79 inter_srequest_array[inter_srequest_count++] = smpi_mpi_isend((char *)rbuf + inter_send_offset, scount, stype,
80 inter_dst, tag, comm);
84 src = inter_rank * intra_comm_size + j;
85 dst = inter_rank * intra_comm_size + j;
89 inter_comm_size) % inter_comm_size) * intra_comm_size + j;
92 inter_comm_size) % inter_comm_size) * intra_comm_size + intra_rank;
94 send_offset = dst_seg * sextent * scount;
95 recv_offset = src_seg * rextent * rcount;
98 if (j != intra_rank) {
100 rrequest_array[rrequest_count++] = smpi_mpi_irecv((char *)rbuf + recv_offset, rcount, rtype, src, tag, comm);
101 srequest_array[srequest_count++] = smpi_mpi_isend((char *)rbuf + send_offset, scount, stype, dst, tag, comm);
107 // wait for inter communication to finish for these rounds (# of round equals NUM_CORE)
108 if (i != inter_comm_size - 1) {
109 smpi_mpi_wait(&inter_rrequest, &status);
114 smpi_mpi_waitall(rrequest_count, rrequest_array, MPI_STATUSES_IGNORE);
115 smpi_mpi_waitall(srequest_count, srequest_array, MPI_STATUSES_IGNORE);
116 smpi_mpi_waitall(inter_srequest_count, inter_srequest_array, MPI_STATUSES_IGNORE);