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/* -*- Mode: C; c-basic-offset:2 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2006 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2006 The Technical University of Chemnitz. All
* rights reserved.
* Copyright (c) 2013-2015 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2014-2018 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2015 Mellanox Technologies. All rights reserved.
* Copyright (c) 2017 IBM Corporation. All rights reserved.
* Copyright (c) 2018 FUJITSU LIMITED. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* Author(s): Torsten Hoefler <htor@cs.indiana.edu>
*
*/
#include "nbc_internal.h"
/* Dissemination implementation of MPI_Ibarrier */
static int nbc_barrier_init(struct ompi_communicator_t *comm, ompi_request_t ** request,
mca_coll_base_module_t *module, bool persistent)
{
int rank, p, maxround, res, recvpeer, sendpeer;
NBC_Schedule *schedule;
ompi_coll_libnbc_module_t *libnbc_module = (ompi_coll_libnbc_module_t*) module;
rank = ompi_comm_rank (comm);
p = ompi_comm_size (comm);
#ifdef NBC_CACHE_SCHEDULE
/* there only one argument set per communicator -> hang it directly at
* the tree-position, NBC_Dict_size[...] is 0 for not initialized and
* 1 for initialized. NBC_Dict[...] is a pointer to the schedule in
* this case */
if (libnbc_module->NBC_Dict_size[NBC_BARRIER] == 0) {
/* we did not init it yet */
#endif
schedule = OBJ_NEW(NBC_Schedule);
if (OPAL_UNLIKELY(NULL == schedule)) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
maxround = ceil_of_log2(p) -1;
for (int round = 0 ; round <= maxround ; ++round) {
sendpeer = (rank + (1 << round)) % p;
/* add p because modulo does not work with negative values */
recvpeer = ((rank - (1 << round)) + p) % p;
/* send msg to sendpeer */
res = NBC_Sched_send (NULL, false, 0, MPI_BYTE, sendpeer, schedule, false);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
OBJ_RELEASE(schedule);
return res;
}
/* recv msg from recvpeer */
res = NBC_Sched_recv (NULL, false, 0, MPI_BYTE, recvpeer, schedule, false);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
OBJ_RELEASE(schedule);
return res;
}
/* end communication round */
if (round < maxround) {
res = NBC_Sched_barrier (schedule);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
OBJ_RELEASE(schedule);
return res;
}
}
}
res = NBC_Sched_commit (schedule);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
OBJ_RELEASE(schedule);
return res;
}
#ifdef NBC_CACHE_SCHEDULE
/* add it */
libnbc_module->NBC_Dict[NBC_BARRIER] = (hb_tree *) schedule;
libnbc_module->NBC_Dict_size[NBC_BARRIER] = 1;
}
OBJ_RETAIN(schedule);
#endif
res = NBC_Schedule_request(schedule, comm, libnbc_module, persistent, request, NULL);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
OBJ_RELEASE(schedule);
return res;
}
return OMPI_SUCCESS;
}
int ompi_coll_libnbc_ibarrier(struct ompi_communicator_t *comm, ompi_request_t ** request,
mca_coll_base_module_t *module) {
int res = nbc_barrier_init(comm, request, module, false);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
return res;
}
res = NBC_Start(*(ompi_coll_libnbc_request_t **)request);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
NBC_Return_handle (*(ompi_coll_libnbc_request_t **)request);
*request = &ompi_request_null.request;
return res;
}
return OMPI_SUCCESS;
}
static int nbc_barrier_inter_init(struct ompi_communicator_t *comm, ompi_request_t ** request,
mca_coll_base_module_t *module, bool persistent)
{
int rank, res, rsize;
NBC_Schedule *schedule;
ompi_coll_libnbc_module_t *libnbc_module = (ompi_coll_libnbc_module_t*) module;
rank = ompi_comm_rank (comm);
rsize = ompi_comm_remote_size (comm);
schedule = OBJ_NEW(NBC_Schedule);
if (OPAL_UNLIKELY(NULL == schedule)) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
if (0 == rank) {
for (int peer = 1 ; peer < rsize ; ++peer) {
res = NBC_Sched_recv (NULL, false, 0, MPI_BYTE, peer, schedule, false);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
OBJ_RELEASE(schedule);
return res;
}
}
}
/* synchronize with the remote root */
res = NBC_Sched_recv (NULL, false, 0, MPI_BYTE, 0, schedule, false);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
OBJ_RELEASE(schedule);
return res;
}
res = NBC_Sched_send (NULL, false, 0, MPI_BYTE, 0, schedule, false);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
OBJ_RELEASE(schedule);
return res;
}
if (0 == rank) {
/* wait for the remote root */
res = NBC_Sched_barrier (schedule);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
OBJ_RELEASE(schedule);
return res;
}
/* inform remote peers that all local peers have entered the barrier */
for (int peer = 1; peer < rsize ; ++peer) {
res = NBC_Sched_send (NULL, false, 0, MPI_BYTE, peer, schedule, false);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
OBJ_RELEASE(schedule);
return res;
}
}
}
res = NBC_Sched_commit (schedule);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
OBJ_RELEASE(schedule);
return res;
}
res = NBC_Schedule_request(schedule, comm, libnbc_module, persistent, request, NULL);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
OBJ_RELEASE(schedule);
return res;
}
return OMPI_SUCCESS;
}
int ompi_coll_libnbc_ibarrier_inter(struct ompi_communicator_t *comm, ompi_request_t ** request,
mca_coll_base_module_t *module) {
int res = nbc_barrier_inter_init(comm, request, module, false);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
return res;
}
res = NBC_Start(*(ompi_coll_libnbc_request_t **)request);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
NBC_Return_handle (*(ompi_coll_libnbc_request_t **)request);
*request = &ompi_request_null.request;
return res;
}
return OMPI_SUCCESS;
}
int ompi_coll_libnbc_barrier_init(struct ompi_communicator_t *comm, MPI_Info info, ompi_request_t ** request,
mca_coll_base_module_t *module) {
int res = nbc_barrier_init(comm, request, module, true);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
return res;
}
return OMPI_SUCCESS;
}
int ompi_coll_libnbc_barrier_inter_init(struct ompi_communicator_t *comm, MPI_Info info, ompi_request_t ** request,
mca_coll_base_module_t *module) {
int res = nbc_barrier_inter_init(comm, request, module, true);
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
return res;
}
return OMPI_SUCCESS;
}
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