1 /* Copyright (c) 2013-2023. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
8 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
9 * University Research and Technology
10 * Corporation. All rights reserved.
11 * Copyright (c) 2004-2009 The University of Tennessee and The University
12 * of Tennessee Research Foundation. All rights
14 * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
15 * University of Stuttgart. All rights reserved.
16 * Copyright (c) 2004-2005 The Regents of the University of California.
17 * All rights reserved.
19 * Additional copyrights may follow
21 /* -*- Mode: C; c-basic-offset:4 ; -*- */
22 /* Copyright (c) 2001-2014, The Ohio State University. All rights
25 * This file is part of the MVAPICH2 software package developed by the
26 * team members of The Ohio State University's Network-Based Computing
27 * Laboratory (NBCL), headed by Professor Dhabaleswar K. (DK) Panda.
29 * For detailed copyright and licensing information, please refer to the
30 * copyright file COPYRIGHT in the top level MVAPICH2 directory.
34 * (C) 2001 by Argonne National Laboratory.
35 * See COPYRIGHT in top-level directory.
38 #include "../colls_private.hpp"
41 #define MPIR_Gather_MV2_Direct gather__ompi_basic_linear
42 #define MPIR_Gather_MV2_two_level_Direct gather__ompi_basic_linear
43 #define MPIR_Gather_intra gather__mpich
44 typedef int (*MV2_Gather_function_ptr) (const void *sendbuf,
46 MPI_Datatype sendtype,
49 MPI_Datatype recvtype,
50 int root, MPI_Comm comm);
52 extern MV2_Gather_function_ptr MV2_Gather_inter_leader_function;
53 extern MV2_Gather_function_ptr MV2_Gather_intra_node_function;
55 #define TEMP_BUF_HAS_NO_DATA (false)
56 #define TEMP_BUF_HAS_DATA (true)
58 namespace simgrid::smpi {
60 /* sendbuf - (in) sender's buffer
61 * sendcnt - (in) sender's element count
62 * sendtype - (in) sender's data type
63 * recvbuf - (in) receiver's buffer
64 * recvcnt - (in) receiver's element count
65 * recvtype - (in) receiver's data type
66 * root - (in)root for the gather operation
67 * rank - (in) global rank(rank in the global comm)
68 * tmp_buf - (out/in) tmp_buf into which intra node
70 * is_data_avail - (in) based on this, tmp_buf acts
71 * as in/out parameter.
72 * 1 - tmp_buf acts as in parameter
73 * 0 - tmp_buf acts as out parameter
74 * comm_ptr - (in) pointer to the communicator
75 * (shmem_comm or intra_sock_comm or
76 * inter-sock_leader_comm)
77 * intra_node_fn_ptr - (in) Function ptr to choose the
78 * intra node gather function
79 * errflag - (out) to record errors
81 static int MPIR_pt_pt_intra_gather(const void* sendbuf, int sendcnt, MPI_Datatype sendtype, void* recvbuf, int recvcnt,
82 MPI_Datatype recvtype, int root, int rank, void* tmp_buf, int nbytes,
83 bool is_data_avail, MPI_Comm comm, MV2_Gather_function_ptr intra_node_fn_ptr)
85 int mpi_errno = MPI_SUCCESS;
86 MPI_Aint recvtype_extent = 0; /* Datatype extent */
87 MPI_Aint true_lb, sendtype_true_extent, recvtype_true_extent;
90 if (sendtype != MPI_DATATYPE_NULL) {
91 sendtype->extent(&true_lb,
92 &sendtype_true_extent);
94 if (recvtype != MPI_DATATYPE_NULL) {
95 recvtype_extent=recvtype->get_extent();
96 recvtype->extent(&true_lb,
97 &recvtype_true_extent);
100 /* Special case, when tmp_buf itself has data */
101 if (rank == root && sendbuf == MPI_IN_PLACE && is_data_avail) {
103 mpi_errno = intra_node_fn_ptr(MPI_IN_PLACE,
104 sendcnt, sendtype, tmp_buf, nbytes,
107 } else if (rank == root && sendbuf == MPI_IN_PLACE) {
108 mpi_errno = intra_node_fn_ptr((char*)recvbuf +
109 rank * recvcnt * recvtype_extent,
110 recvcnt, recvtype, tmp_buf, nbytes,
113 mpi_errno = intra_node_fn_ptr(sendbuf, sendcnt, sendtype,
114 tmp_buf, nbytes, MPI_BYTE,
124 int gather__mvapich2_two_level(const void *sendbuf,
126 MPI_Datatype sendtype,
129 MPI_Datatype recvtype,
133 unsigned char* leader_gather_buf = nullptr;
135 int local_rank, local_size;
136 int leader_comm_rank = -1, leader_comm_size = 0;
137 int mpi_errno = MPI_SUCCESS;
138 int recvtype_size = 0, sendtype_size = 0, nbytes = 0;
139 int leader_root, leader_of_root;
141 MPI_Aint sendtype_extent = 0, recvtype_extent = 0; /* Datatype extent */
142 MPI_Aint true_lb = 0, sendtype_true_extent = 0, recvtype_true_extent = 0;
143 MPI_Comm shmem_comm, leader_comm;
144 unsigned char* tmp_buf = nullptr;
146 // if not set (use of the algo directly, without mvapich2 selector)
147 if (MV2_Gather_intra_node_function == nullptr)
148 MV2_Gather_intra_node_function = gather__mpich;
150 if (comm->get_leaders_comm() == MPI_COMM_NULL) {
153 comm_size = comm->size();
156 if (((rank == root) && (recvcnt == 0)) ||
157 ((rank != root) && (sendcnt == 0))) {
161 if (sendtype != MPI_DATATYPE_NULL) {
162 sendtype_extent=sendtype->get_extent();
163 sendtype_size=sendtype->size();
164 sendtype->extent(&true_lb,
165 &sendtype_true_extent);
167 if (recvtype != MPI_DATATYPE_NULL) {
168 recvtype_extent=recvtype->get_extent();
169 recvtype_size=recvtype->size();
170 recvtype->extent(&true_lb,
171 &recvtype_true_extent);
174 /* extract the rank,size information for the intra-node
176 shmem_comm = comm->get_intra_comm();
177 local_rank = shmem_comm->rank();
178 local_size = shmem_comm->size();
180 if (local_rank == 0) {
181 /* Node leader. Extract the rank, size information for the leader
183 leader_comm = comm->get_leaders_comm();
184 if(leader_comm==MPI_COMM_NULL){
185 leader_comm = MPI_COMM_WORLD;
187 leader_comm_size = leader_comm->size();
188 leader_comm_rank = leader_comm->size();
192 nbytes = recvcnt * recvtype_size;
195 nbytes = sendcnt * sendtype_size;
198 #if defined(_SMP_LIMIC_)
199 if((g_use_limic2_coll) && (shmem_commptr->ch.use_intra_sock_comm == 1)
200 && (use_limic_gather)
201 &&((num_scheme == USE_GATHER_PT_PT_BINOMIAL)
202 || (num_scheme == USE_GATHER_PT_PT_DIRECT)
203 ||(num_scheme == USE_GATHER_PT_LINEAR_BINOMIAL)
204 || (num_scheme == USE_GATHER_PT_LINEAR_DIRECT)
205 || (num_scheme == USE_GATHER_LINEAR_PT_BINOMIAL)
206 || (num_scheme == USE_GATHER_LINEAR_PT_DIRECT)
207 || (num_scheme == USE_GATHER_LINEAR_LINEAR)
208 || (num_scheme == USE_GATHER_SINGLE_LEADER))) {
210 mpi_errno = MV2_Gather_intra_node_function(sendbuf, sendcnt, sendtype,
211 recvbuf, recvcnt,recvtype,
215 #endif/*#if defined(_SMP_LIMIC_)*/
217 if (local_rank == 0) {
218 /* Node leader, allocate tmp_buffer */
220 tmp_buf = smpi_get_tmp_recvbuffer(recvcnt * std::max(recvtype_extent, recvtype_true_extent) * local_size);
222 tmp_buf = smpi_get_tmp_sendbuffer(sendcnt * std::max(sendtype_extent, sendtype_true_extent) * local_size);
224 if (tmp_buf == nullptr) {
225 mpi_errno = MPI_ERR_OTHER;
229 /*while testing mpich2 gather test, we see that
230 * which basically splits the comm, and we come to
231 * a point, where use_intra_sock_comm == 0, but if the
232 * intra node function is MPIR_Intra_node_LIMIC_Gather_MV2,
233 * it would use the intra sock comm. In such cases, we
234 * fallback to binomial as a default case.*/
235 #if defined(_SMP_LIMIC_)
236 if(*MV2_Gather_intra_node_function == MPIR_Intra_node_LIMIC_Gather_MV2) {
238 mpi_errno = MPIR_pt_pt_intra_gather(sendbuf,sendcnt, sendtype,
239 recvbuf, recvcnt, recvtype,
242 TEMP_BUF_HAS_NO_DATA,
248 /*We are gathering the data into tmp_buf and the output
249 * will be of MPI_BYTE datatype. Since the tmp_buf has no
250 * local data, we pass is_data_avail = TEMP_BUF_HAS_NO_DATA*/
251 mpi_errno = MPIR_pt_pt_intra_gather(sendbuf,sendcnt, sendtype,
252 recvbuf, recvcnt, recvtype,
255 TEMP_BUF_HAS_NO_DATA,
257 MV2_Gather_intra_node_function
261 leader_comm = comm->get_leaders_comm();
262 int* leaders_map = comm->get_leaders_map();
263 leader_of_root = comm->group()->rank(leaders_map[root]);
264 leader_root = leader_comm->group()->rank(leaders_map[root]);
265 /* leader_root is the rank of the leader of the root in leader_comm.
266 * leader_root is to be used as the root of the inter-leader gather ops
268 if (not comm->is_uniform()) {
269 if (local_rank == 0) {
270 int* displs = nullptr;
271 int* recvcnts = nullptr;
274 /* Node leaders have all the data. But, different nodes can have
275 * different number of processes. Do a Gather first to get the
276 * buffer lengths at each leader, followed by a Gatherv to move
279 if (leader_comm_rank == leader_root && root != leader_of_root) {
280 /* The root of the Gather operation is not a node-level
281 * leader and this process's rank in the leader_comm
282 * is the same as leader_root */
285 smpi_get_tmp_recvbuffer(recvcnt * std::max(recvtype_extent, recvtype_true_extent) * comm_size);
288 smpi_get_tmp_sendbuffer(sendcnt * std::max(sendtype_extent, sendtype_true_extent) * comm_size);
290 if (leader_gather_buf == nullptr) {
291 mpi_errno = MPI_ERR_OTHER;
296 node_sizes = comm->get_non_uniform_map();
298 if (leader_comm_rank == leader_root) {
299 displs = new int[leader_comm_size];
300 recvcnts = new int[leader_comm_size];
303 if (root == leader_of_root) {
304 /* The root of the gather operation is also the node
305 * leader. Receive into recvbuf and we are done */
306 if (leader_comm_rank == leader_root) {
307 recvcnts[0] = node_sizes[0] * recvcnt;
310 for (i = 1; i < leader_comm_size; i++) {
311 displs[i] = displs[i - 1] + node_sizes[i - 1] * recvcnt;
312 recvcnts[i] = node_sizes[i] * recvcnt;
315 colls::gatherv(tmp_buf, local_size * nbytes, MPI_BYTE, recvbuf, recvcnts, displs, recvtype, leader_root,
318 /* The root of the gather operation is not the node leader.
319 * Receive into leader_gather_buf and then send
321 if (leader_comm_rank == leader_root) {
322 recvcnts[0] = node_sizes[0] * nbytes;
325 for (i = 1; i < leader_comm_size; i++) {
326 displs[i] = displs[i - 1] + node_sizes[i - 1] * nbytes;
327 recvcnts[i] = node_sizes[i] * nbytes;
330 colls::gatherv(tmp_buf, local_size * nbytes, MPI_BYTE, leader_gather_buf, recvcnts, displs, MPI_BYTE,
331 leader_root, leader_comm);
333 if (leader_comm_rank == leader_root) {
339 /* All nodes have the same number of processes.
340 * Just do one Gather to get all
341 * the data at the leader of the root process */
342 if (local_rank == 0) {
343 if (leader_comm_rank == leader_root && root != leader_of_root) {
344 /* The root of the Gather operation is not a node-level leader
346 leader_gather_buf = smpi_get_tmp_sendbuffer(nbytes * comm_size);
347 if (leader_gather_buf == nullptr) {
348 mpi_errno = MPI_ERR_OTHER;
352 if (root == leader_of_root) {
353 mpi_errno = MPIR_Gather_MV2_Direct(tmp_buf,
356 recvcnt * local_size,
357 recvtype, leader_root,
361 mpi_errno = MPIR_Gather_MV2_Direct(tmp_buf, nbytes * local_size,
362 MPI_BYTE, leader_gather_buf,
364 MPI_BYTE, leader_root,
369 if ((local_rank == 0) && (root != rank)
370 && (leader_of_root == rank)) {
371 Request::send(leader_gather_buf,
372 nbytes * comm_size, MPI_BYTE,
373 root, COLL_TAG_GATHER, comm);
376 if (rank == root && local_rank != 0) {
377 /* The root of the gather operation is not the node leader. Receive
378 y* data from the node leader */
379 Request::recv(recvbuf, recvcnt * comm_size, recvtype,
380 leader_of_root, COLL_TAG_GATHER, comm,
384 /* check if multiple threads are calling this collective function */
385 if (local_rank == 0 ) {
386 if (tmp_buf != nullptr) {
387 smpi_free_tmp_buffer(tmp_buf);
389 if (leader_gather_buf != nullptr) {
390 smpi_free_tmp_buffer(leader_gather_buf);
396 } // namespace simgrid::smpi