1 #include "colls_private.h"
6 int smpi_coll_tuned_allgather_smp_simple(void *send_buf, int scount,
7 MPI_Datatype stype, void *recv_buf,
8 int rcount, MPI_Datatype rtype,
11 int src, dst, comm_size, rank;
12 comm_size = smpi_comm_size(comm);
14 int num_core = simcall_host_get_core(SIMIX_host_self());
15 // do we use the default one or the number of cores in the platform ?
16 // if the number of cores is one, the platform may be simulated with 1 node = 1 core
17 if (num_core == 1) num_core = NUM_CORE;
19 if(comm_size%num_core)
20 THROWF(arg_error,0, "allgather SMP simple algorithm can't be used with non multiple of NUM_CORE=%d number of processes ! ", num_core);
22 rank = smpi_comm_rank(comm);
23 MPI_Aint rextent, sextent;
24 rextent = smpi_datatype_get_extent(rtype);
25 sextent = smpi_datatype_get_extent(stype);
26 int tag = COLL_TAG_ALLGATHER;
28 int i, send_offset, recv_offset;
29 int intra_rank, inter_rank;
30 intra_rank = rank % num_core;
31 inter_rank = rank / num_core;
32 int inter_comm_size = (comm_size + num_core - 1) / num_core;
33 int num_core_in_current_smp = num_core;
35 // the last SMP node may have fewer number of running processes than all others
36 if (inter_rank == (inter_comm_size - 1)) {
37 num_core_in_current_smp = comm_size - (inter_rank * num_core);
40 recv_offset = rank * rextent * rcount;
41 smpi_mpi_sendrecv(send_buf, scount, stype, rank, tag,
42 ((char *) recv_buf + recv_offset), rcount, rtype, rank, tag,
44 for (i = 1; i < num_core_in_current_smp; i++) {
47 (inter_rank * num_core) + (intra_rank + i) % (num_core_in_current_smp);
49 (inter_rank * num_core) + (intra_rank - i +
50 num_core_in_current_smp) %
51 (num_core_in_current_smp);
52 recv_offset = src * rextent * rcount;
54 smpi_mpi_sendrecv(send_buf, scount, stype, dst, tag,
55 ((char *) recv_buf + recv_offset), rcount, rtype, src, tag,
60 // INTER-SMP-ALLGATHER
61 // Every root of each SMP node post INTER-Sendrecv, then do INTRA-Bcast for each receiving message
65 if (intra_rank == 0) {
66 MPI_Request *reqs, *req_ptr;
67 int num_req = (inter_comm_size - 1) * 2;
68 reqs = (MPI_Request *) xbt_malloc(num_req * sizeof(MPI_Request));
71 stat = (MPI_Status *) xbt_malloc(num_req * sizeof(MPI_Status));
73 for (i = 1; i < inter_comm_size; i++) {
75 //dst = ((inter_rank+i)%inter_comm_size) * num_core;
76 src = ((inter_rank - i + inter_comm_size) % inter_comm_size) * num_core;
77 //send_offset = (rank * sextent * scount);
78 recv_offset = (src * sextent * scount);
79 // smpi_mpi_sendrecv((recv_buf+send_offset), (scount * num_core), stype, dst, tag,
80 // (recv_buf+recv_offset), (rcount * num_core), rtype, src, tag, comm, &status);
81 //MPIC_Isend((recv_buf+send_offset), (scount * num_core), stype, dst, tag, comm, req_ptr++);
82 *(req_ptr++) = smpi_mpi_irecv(((char *) recv_buf + recv_offset), (rcount * num_core), rtype,
85 for (i = 1; i < inter_comm_size; i++) {
87 dst = ((inter_rank + i) % inter_comm_size) * num_core;
88 //src = ((inter_rank-i+inter_comm_size)%inter_comm_size) * num_core;
89 send_offset = (rank * sextent * scount);
90 //recv_offset = (src * sextent * scount);
91 // smpi_mpi_sendrecv((recv_buf+send_offset), (scount * num_core), stype, dst, tag,
92 // (recv_buf+recv_offset), (rcount * num_core), rtype, src, tag, comm, &status);
93 *(req_ptr++) = smpi_mpi_isend(((char *) recv_buf + send_offset), (scount * num_core), stype,
95 //MPIC_Irecv((recv_buf+recv_offset), (rcount * num_core), rtype, src, tag, comm, req_ptr++);
97 smpi_mpi_waitall(num_req, reqs, stat);
102 //INTRA-BCAST (use flat tree)
104 if (intra_rank == 0) {
105 for (i = 1; i < num_core_in_current_smp; i++) {
106 //printf("rank = %d, num = %d send to %d\n",rank, num_core_in_current_smp, (rank + i));
107 smpi_mpi_send(recv_buf, (scount * comm_size), stype, (rank + i), tag, comm);
110 //printf("rank = %d recv from %d\n",rank, (inter_rank * num_core));
111 smpi_mpi_recv(recv_buf, (rcount * comm_size), rtype, (inter_rank * num_core),