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);
21 THROWF(arg_error,0, "allgather loosely lr algorithm can't be used with non multiple of NUM_CORE=4 number of processes ! ");
23 rank = smpi_comm_rank(comm);
24 MPI_Aint rextent, sextent;
25 rextent = smpi_datatype_get_extent(rtype);
26 sextent = smpi_datatype_get_extent(stype);
27 MPI_Request inter_rrequest;
28 MPI_Request rrequest_array[128];
29 MPI_Request srequest_array[128];
30 MPI_Request inter_srequest_array[128];
33 int rrequest_count = 0;
34 int srequest_count = 0;
35 int inter_srequest_count = 0;
39 intra_rank = rank % NUM_CORE;
40 inter_rank = rank / NUM_CORE;
41 inter_comm_size = (comm_size + NUM_CORE - 1) / NUM_CORE;
42 intra_comm_size = NUM_CORE;
46 //copy corresponding message from sbuf to rbuf
47 recv_offset = rank * rextent * rcount;
48 smpi_mpi_sendrecv(sbuf, scount, stype, rank, tag,
49 (char *)rbuf + recv_offset, rcount, rtype, rank, tag, comm, &status);
52 int inter_send_offset, inter_recv_offset;
56 inter_srequest_count = 0;
58 for (i = 0; i < inter_comm_size; i++) {
60 // inter_communication
62 inter_dst = (rank + intra_comm_size) % comm_size;
63 inter_src = (rank - intra_comm_size + comm_size) % comm_size;
66 ((inter_rank - 1 - i +
67 inter_comm_size) % inter_comm_size) * intra_comm_size + intra_rank;
70 inter_comm_size) % inter_comm_size) * intra_comm_size + intra_rank;
72 inter_send_offset = dst_seg * sextent * scount;
73 inter_recv_offset = src_seg * rextent * rcount;
75 for (j = 0; j < intra_comm_size; j++) {
77 // inter communication
78 if (intra_rank == j) {
79 if (i != inter_comm_size - 1) {
81 inter_rrequest = smpi_mpi_irecv((char *)rbuf + inter_recv_offset, rcount, rtype,
82 inter_src, tag, comm);
83 inter_srequest_array[inter_srequest_count++] = smpi_mpi_isend((char *)rbuf + inter_send_offset, scount, stype,
84 inter_dst, tag, comm);
88 src = inter_rank * intra_comm_size + j;
89 dst = inter_rank * intra_comm_size + j;
93 inter_comm_size) % inter_comm_size) * intra_comm_size + j;
96 inter_comm_size) % inter_comm_size) * intra_comm_size + intra_rank;
98 send_offset = dst_seg * sextent * scount;
99 recv_offset = src_seg * rextent * rcount;
102 if (j != intra_rank) {
104 rrequest_array[rrequest_count++] = smpi_mpi_irecv((char *)rbuf + recv_offset, rcount, rtype, src, tag, comm);
105 srequest_array[srequest_count++] = smpi_mpi_isend((char *)rbuf + send_offset, scount, stype, dst, tag, comm);
111 // wait for inter communication to finish for these rounds (# of round equals NUM_CORE)
112 if (i != inter_comm_size - 1) {
113 smpi_mpi_wait(&inter_rrequest, &status);
118 smpi_mpi_waitall(rrequest_count, rrequest_array, MPI_STATUSES_IGNORE);
119 smpi_mpi_waitall(srequest_count, srequest_array, MPI_STATUSES_IGNORE);
120 smpi_mpi_waitall(inter_srequest_count, inter_srequest_array, MPI_STATUSES_IGNORE);