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/**
* @file synchronizer_impl_tmpl.hh
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Wed Sep 07 2016
* @date last modification: Tue Feb 20 2018
*
* @brief Implementation of the SynchronizerImpl
*
* @section LICENSE
*
* Copyright (©) 2016-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "synchronizer_impl.hh"
/* -------------------------------------------------------------------------- */
#ifndef __AKANTU_SYNCHRONIZER_IMPL_TMPL_HH__
#define __AKANTU_SYNCHRONIZER_IMPL_TMPL_HH__
namespace akantu {
/* -------------------------------------------------------------------------- */
template <class Entity>
SynchronizerImpl<Entity>::SynchronizerImpl(const Communicator & comm,
const ID & id, MemoryID memory_id)
: Synchronizer(comm, id, memory_id), communications(comm) {}
/* -------------------------------------------------------------------------- */
template <class Entity>
SynchronizerImpl<Entity>::SynchronizerImpl(const SynchronizerImpl & other,
const ID & id)
: Synchronizer(other), communications(other.communications) {
this->id = id;
}
/* -------------------------------------------------------------------------- */
template <class Entity>
void SynchronizerImpl<Entity>::communicateOnce(
const std::tuple<CommunicationSendRecv, CommunicationSendRecv> &
send_recv_schemes,
const Tag::CommTags & comm_tag, DataAccessor<Entity> & data_accessor,
const SynchronizationTag & tag) const {
// no need to synchronize
if (this->nb_proc == 1)
return;
CommunicationSendRecv send_dir, recv_dir;
std::tie(send_dir, recv_dir) = send_recv_schemes;
using CommunicationRequests = std::vector<CommunicationRequest>;
using CommunicationBuffers = std::map<UInt, CommunicationBuffer>;
CommunicationRequests send_requests, recv_requests;
CommunicationBuffers send_buffers, recv_buffers;
auto postComm = [&](const auto & sr, auto & buffers,
auto & requests) -> void {
for (auto && pair : communications.iterateSchemes(sr)) {
auto & proc = pair.first;
const auto & scheme = pair.second;
if (scheme.size() == 0)
continue;
auto & buffer = buffers[proc];
auto buffer_size = data_accessor.getNbData(scheme, tag);
if (buffer_size == 0)
continue;
#ifndef AKANTU_NDEBUG
buffer_size += this->sanityCheckDataSize(scheme, tag, false);
#endif
buffer.resize(buffer_size);
if (sr == recv_dir) {
requests.push_back(communicator.asyncReceive(
buffer, proc,
Tag::genTag(this->rank, UInt(tag), comm_tag, this->hash_id)));
} else {
#ifndef AKANTU_NDEBUG
this->packSanityCheckData(buffer, scheme, tag);
#endif
data_accessor.packData(buffer, scheme, tag);
AKANTU_DEBUG_ASSERT(
buffer.getPackedSize() == buffer.size(),
"The data accessor did not pack all the data it "
"promised in communication with tag "
<< tag << " (Promised: " << buffer.size()
<< "bytes, packed: " << buffer.getPackedSize() << "bytes [avg: "
<< Real(buffer.size() - buffer.getPackedSize()) / scheme.size()
<< "bytes per entity missing])");
send_requests.push_back(communicator.asyncSend(
buffer, proc,
Tag::genTag(proc, UInt(tag), comm_tag, this->hash_id)));
}
}
};
// post the receive requests
postComm(recv_dir, recv_buffers, recv_requests);
// post the send data requests
postComm(send_dir, send_buffers, send_requests);
// treat the receive requests
UInt request_ready;
while ((request_ready = communicator.waitAny(recv_requests)) != UInt(-1)) {
auto & req = recv_requests[request_ready];
auto proc = req.getSource();
auto & buffer = recv_buffers[proc];
const auto & scheme = this->communications.getScheme(proc, recv_dir);
#ifndef AKANTU_NDEBUG
this->unpackSanityCheckData(buffer, scheme, tag, proc, this->rank);
#endif
data_accessor.unpackData(buffer, scheme, tag);
AKANTU_DEBUG_ASSERT(
buffer.getLeftToUnpack() == 0,
"The data accessor ignored some data in communication with tag "
<< tag);
req.free();
recv_requests.erase(recv_requests.begin() + request_ready);
}
communicator.waitAll(send_requests);
communicator.freeCommunicationRequest(send_requests);
}
/* -------------------------------------------------------------------------- */
template <class Entity>
void SynchronizerImpl<Entity>::slaveReductionOnceImpl(
DataAccessor<Entity> & data_accessor,
const SynchronizationTag & tag) const {
communicateOnce(std::make_tuple(_recv, _send), Tag::_REDUCE, data_accessor,
tag);
}
/* -------------------------------------------------------------------------- */
template <class Entity>
void SynchronizerImpl<Entity>::synchronizeOnceImpl(
DataAccessor<Entity> & data_accessor,
const SynchronizationTag & tag) const {
communicateOnce(std::make_tuple(_send, _recv), Tag::_SYNCHRONIZE,
data_accessor, tag);
}
/* -------------------------------------------------------------------------- */
template <class Entity>
void SynchronizerImpl<Entity>::asynchronousSynchronizeImpl(
const DataAccessor<Entity> & data_accessor,
const SynchronizationTag & tag) {
AKANTU_DEBUG_IN();
if (not this->communications.hasCommunicationSize(tag))
this->computeBufferSize(data_accessor, tag);
this->communications.incrementCounter(tag);
// Posting the receive -------------------------------------------------------
if (this->communications.hasPendingRecv(tag)) {
AKANTU_CUSTOM_EXCEPTION_INFO(
debug::CommunicationException(),
"There must still be some pending receive communications."
<< " Tag is " << tag << " Cannot start new ones");
}
for (auto && comm_desc : this->communications.iterateRecv(tag)) {
comm_desc.postRecv(this->hash_id);
}
// Posting the sends -------------------------------------------------------
if (communications.hasPendingSend(tag)) {
AKANTU_CUSTOM_EXCEPTION_INFO(
debug::CommunicationException(),
"There must be some pending sending communications."
<< " Tag is " << tag);
}
for (auto && comm_desc : this->communications.iterateSend(tag)) {
comm_desc.resetBuffer();
#ifndef AKANTU_NDEBUG
this->packSanityCheckData(comm_desc);
#endif
comm_desc.packData(data_accessor);
comm_desc.postSend(this->hash_id);
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <class Entity>
void SynchronizerImpl<Entity>::waitEndSynchronizeImpl(
DataAccessor<Entity> & data_accessor, const SynchronizationTag & tag) {
AKANTU_DEBUG_IN();
#ifndef AKANTU_NDEBUG
if (this->communications.begin(tag, _recv) !=
this->communications.end(tag, _recv) &&
!this->communications.hasPendingRecv(tag))
AKANTU_CUSTOM_EXCEPTION_INFO(debug::CommunicationException(),
"No pending communication with the tag \""
<< tag);
#endif
auto recv_end = this->communications.end(tag, _recv);
decltype(recv_end) recv_it;
while ((recv_it = this->communications.waitAnyRecv(tag)) != recv_end) {
auto && comm_desc = *recv_it;
#ifndef AKANTU_NDEBUG
this->unpackSanityCheckData(comm_desc);
#endif
comm_desc.unpackData(data_accessor);
comm_desc.resetBuffer();
comm_desc.freeRequest();
}
this->communications.waitAllSend(tag);
this->communications.freeSendRequests(tag);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <class Entity>
void SynchronizerImpl<Entity>::computeAllBufferSizes(
const DataAccessor<Entity> & data_accessor) {
for (auto && tag : this->communications.iterateTags()) {
this->computeBufferSize(data_accessor, tag);
}
}
/* -------------------------------------------------------------------------- */
template <class Entity>
void SynchronizerImpl<Entity>::computeBufferSizeImpl(
const DataAccessor<Entity> & data_accessor,
const SynchronizationTag & tag) {
AKANTU_DEBUG_IN();
if (not this->communications.hasCommunication(tag)) {
this->communications.initializeCommunications(tag);
AKANTU_DEBUG_ASSERT(communications.hasCommunication(tag) == true,
"Communications where not properly initialized");
}
for (auto sr : iterate_send_recv) {
for (auto && pair : this->communications.iterateSchemes(sr)) {
auto proc = pair.first;
const auto & scheme = pair.second;
UInt size = 0;
#ifndef AKANTU_NDEBUG
size += this->sanityCheckDataSize(scheme, tag);
#endif
size += data_accessor.getNbData(scheme, tag);
AKANTU_DEBUG_INFO("I have "
<< size << "(" << printMemorySize<char>(size) << " - "
<< scheme.size() << " element(s)) data to "
<< std::string(sr == _recv ? "receive from" : "send to")
<< proc << " for tag " << tag);
this->communications.setCommunicationSize(tag, proc, size, sr);
}
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <typename Entity> void SynchronizerImpl<Entity>::reset() {
AKANTU_DEBUG_IN();
communications.resetSchemes();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <typename Entity>
template <typename Pred>
void SynchronizerImpl<Entity>::split(SynchronizerImpl<Entity> & in_synchronizer,
Pred && pred) {
AKANTU_DEBUG_IN();
auto filter_list = [&](auto & list, auto & new_list) {
auto copy = list;
list.resize(0);
new_list.resize(0);
for (auto && entity : copy) {
if (std::forward<Pred>(pred)(entity)) {
new_list.push_back(entity);
} else {
list.push_back(entity);
}
}
};
for (auto sr : iterate_send_recv) {
for (auto & scheme_pair :
in_synchronizer.communications.iterateSchemes(sr)) {
auto proc = scheme_pair.first;
auto & scheme = scheme_pair.second;
auto & new_scheme = communications.createScheme(proc, sr);
filter_list(scheme, new_scheme);
}
}
in_synchronizer.communications.invalidateSizes();
communications.invalidateSizes();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <typename Entity>
template <typename Updater>
void SynchronizerImpl<Entity>::updateSchemes(Updater && scheme_updater) {
for (auto sr : iterate_send_recv) {
for (auto & scheme_pair : communications.iterateSchemes(sr)) {
auto proc = scheme_pair.first;
auto & scheme = scheme_pair.second;
std::forward<Updater>(scheme_updater)(scheme, proc, sr);
}
}
communications.invalidateSizes();
}
/* -------------------------------------------------------------------------- */
template <typename Entity>
template <typename Pred>
void SynchronizerImpl<Entity>::filterScheme(Pred && pred) {
std::vector<CommunicationRequest> requests;
std::unordered_map<UInt, Array<UInt>> keep_entities;
auto filter_list = [](const auto & keep, auto & list) {
Array<Entity> new_list;
for (const auto & keep_entity : keep) {
const Entity & entity = list(keep_entity);
new_list.push_back(entity);
}
list.copy(new_list);
};
// loop over send_schemes
for (auto & scheme_pair : communications.iterateSchemes(_recv)) {
auto proc = scheme_pair.first;
auto & scheme = scheme_pair.second;
auto & keep_entity = keep_entities[proc];
for (auto && entity : enumerate(scheme)) {
if (pred(std::get<1>(entity))) {
keep_entity.push_back(std::get<0>(entity));
}
}
auto tag = Tag::genTag(this->rank, 0, Tag::_MODIFY_SCHEME);
AKANTU_DEBUG_INFO("I have " << keep_entity.size()
<< " elements to still receive from processor "
<< proc << " (communication tag : " << tag
<< ")");
filter_list(keep_entity, scheme);
requests.push_back(communicator.asyncSend(keep_entity, proc, tag));
}
// clean the receive scheme
for (auto & scheme_pair : communications.iterateSchemes(_send)) {
auto proc = scheme_pair.first;
auto & scheme = scheme_pair.second;
auto tag = Tag::genTag(proc, 0, Tag::_MODIFY_SCHEME);
AKANTU_DEBUG_INFO("Waiting list of elements to keep from processor "
<< proc << " (communication tag : " << tag << ")");
CommunicationStatus status;
communicator.probe<UInt>(proc, tag, status);
Array<UInt> keep_entity(status.size(), 1, "keep_element");
AKANTU_DEBUG_INFO("I have "
<< keep_entity.size()
<< " elements to keep in my send list to processor "
<< proc << " (communication tag : " << tag << ")");
communicator.receive(keep_entity, proc, tag);
filter_list(keep_entity, scheme);
}
communicator.waitAll(requests);
communicator.freeCommunicationRequest(requests);
communications.invalidateSizes();
}
/* -------------------------------------------------------------------------- */
template <class Entity> void SynchronizerImpl<Entity>::swapSendRecv() {
communications.swapSendRecv();
}
/* -------------------------------------------------------------------------- */
template <class Entity>
void SynchronizerImpl<Entity>::copySchemes(const SynchronizerImpl & other) {
reset();
for (auto sr : iterate_send_recv) {
for (auto & scheme_pair : other.communications.iterateSchemes(sr)) {
auto proc = scheme_pair.first;
auto & other_scheme = scheme_pair.second;
auto & scheme = communications.createScheme(proc, sr);
scheme.copy(other_scheme);
}
}
}
/* -------------------------------------------------------------------------- */
template <class Entity>
SynchronizerImpl<Entity> & SynchronizerImpl<Entity>::
operator=(const SynchronizerImpl & other) {
copySchemes(other);
return *this;
}
/* -------------------------------------------------------------------------- */
template <class Entity>
UInt SynchronizerImpl<Entity>::sanityCheckDataSize(const Array<Entity> &,
const SynchronizationTag &,
bool is_comm_desc) const {
if (not is_comm_desc) {
return 0;
}
UInt size = 0;
size += sizeof(SynchronizationTag); // tag
size += sizeof(UInt); // comm_desc.getNbData();
size += sizeof(UInt); // comm_desc.getProc();
size += sizeof(this->rank); // mesh.getCommunicator().whoAmI();
return size;
}
/* -------------------------------------------------------------------------- */
template <class Entity>
void SynchronizerImpl<Entity>::packSanityCheckData(
CommunicationDescriptor<Entity> & comm_desc) const {
auto & buffer = comm_desc.getBuffer();
buffer << comm_desc.getTag();
buffer << comm_desc.getNbData();
buffer << comm_desc.getProc();
buffer << this->rank;
const auto & tag = comm_desc.getTag();
const auto & send_element = comm_desc.getScheme();
this->packSanityCheckData(buffer, send_element, tag);
}
/* -------------------------------------------------------------------------- */
template <class Entity>
void SynchronizerImpl<Entity>::unpackSanityCheckData(
CommunicationDescriptor<Entity> & comm_desc) const {
auto & buffer = comm_desc.getBuffer();
const auto & tag = comm_desc.getTag();
auto nb_data = comm_desc.getNbData();
auto proc = comm_desc.getProc();
auto rank = this->rank;
decltype(nb_data) recv_nb_data;
decltype(proc) recv_proc;
decltype(rank) recv_rank;
SynchronizationTag t;
buffer >> t;
buffer >> recv_nb_data;
buffer >> recv_proc;
buffer >> recv_rank;
AKANTU_DEBUG_ASSERT(
t == tag, "The tag received does not correspond to the tag expected");
AKANTU_DEBUG_ASSERT(
nb_data == recv_nb_data,
"The nb_data received does not correspond to the nb_data expected");
AKANTU_DEBUG_ASSERT(UInt(recv_rank) == proc,
"The rank received does not correspond to the proc");
AKANTU_DEBUG_ASSERT(recv_proc == UInt(rank),
"The proc received does not correspond to the rank");
auto & recv_element = comm_desc.getScheme();
this->unpackSanityCheckData(buffer, recv_element, tag, proc, rank);
}
/* -------------------------------------------------------------------------- */
} // namespace akantu
#endif /* __AKANTU_SYNCHRONIZER_IMPL_TMPL_HH__ */
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