/
carrier.cc
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carrier.cc
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// Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <algorithm>
#include "paddle/fluid/distributed/fleet_executor/carrier.h"
#include "paddle/fluid/distributed/fleet_executor/global.h"
#include "paddle/fluid/distributed/fleet_executor/interceptor.h"
#include "paddle/fluid/distributed/fleet_executor/message_bus.h"
#include "paddle/fluid/distributed/fleet_executor/runtime_graph.h"
#include "paddle/fluid/distributed/fleet_executor/task_node.h"
#include "paddle/fluid/framework/garbage_collector.h"
#include "paddle/fluid/framework/program_desc.h"
#include "paddle/fluid/framework/scope.h"
#include "paddle/fluid/framework/variable_helper.h"
namespace paddle {
namespace distributed {
USE_INTERCEPTOR(Source);
USE_INTERCEPTOR(Compute);
USE_INTERCEPTOR(Amplifier);
USE_INTERCEPTOR(Sink);
void Carrier::Init(
int64_t rank,
const std::unordered_map<int64_t, int64_t>& interceptor_id_to_rank) {
rank_ = rank;
interceptor_id_to_rank_ = interceptor_id_to_rank;
// TODO(fleet_exe dev): thread pool
thread_num_ = 1;
thread_pool_.SetThreadNum(thread_num_);
thread_pool_.Start();
}
void Carrier::Init(
int64_t rank,
const std::unordered_map<int64_t, int64_t>& interceptor_id_to_rank,
const std::unordered_map<int64_t, TaskNode*>& interceptor_id_to_node,
const framework::ProgramDesc& program, framework::Scope* scope,
int64_t num_micro_batches, const platform::Place& place,
const std::vector<std::string>& inference_root_scope_vars) {
rank_ = rank;
interceptor_id_to_rank_ = interceptor_id_to_rank;
interceptor_id_to_node_ = interceptor_id_to_node;
place_ = place;
root_scope_ = scope;
dev_ctx_ = platform::DeviceContextPool::Instance().Get(place_);
PADDLE_ENFORCE_NOT_NULL(root_scope_, platform::errors::InvalidArgument(
"root_scope can not be nullptr"));
minibatch_scope_ = &root_scope_->NewScope();
microbatch_scopes_.resize(num_micro_batches);
for (int i = 0; i < num_micro_batches; ++i) {
microbatch_scopes_[i] = &minibatch_scope_->NewScope();
CopyParameters(i, program, inference_root_scope_vars);
}
// TODO(fleet_exe dev): thread pool
thread_num_ = 1;
thread_pool_.SetThreadNum(thread_num_);
thread_pool_.Start();
CreateInterceptors();
is_init_ = true;
}
void Carrier::Release() {
if (root_scope_) {
root_scope_->DropKids();
}
}
Carrier::~Carrier() { VLOG(3) << "Carrier's destructor."; }
void Carrier::CopyParameters(
int microbatch_id, const framework::ProgramDesc& program,
const std::vector<std::string>& inference_root_scope_vars) {
auto& global_block = program.Block(0);
std::map<std::string, int> inference_root_scope_var_map;
for (auto var_name : inference_root_scope_vars) {
inference_root_scope_var_map.insert({var_name, 1});
}
for (auto& var : global_block.AllVars()) {
std::string var_name = var->Name();
bool force_root = inference_root_scope_var_map.find(var_name) !=
inference_root_scope_var_map.end();
if (force_root) {
VLOG(4) << var_name << " will be forced to be created in the root scope.";
}
if ((var->Persistable() || force_root) && microbatch_id == 0) {
auto* ptr = root_scope_->Var(var->Name());
InitializeVariable(ptr, var->GetType());
VLOG(5) << "Create persistable var: " << var->Name()
<< ", which pointer is " << ptr;
} else if (!var->Persistable()) {
auto* ptr = microbatch_scopes_[microbatch_id]->Var(var->Name());
VLOG(5) << "Create variable " << var->Name() << " for microbatch "
<< microbatch_id << ", which pointer is " << ptr << ".";
InitializeVariable(ptr, var->GetType());
}
}
}
bool Carrier::EnqueueInterceptorMessage(
const InterceptorMessage& interceptor_message) {
PADDLE_ENFORCE_EQ(
interceptor_message.ctrl_message(), false,
platform::errors::Fatal(
"Control message should be only send inter rank using message bus."));
int64_t dst_id = interceptor_message.dst_id();
Interceptor* dst_interceptor = GetInterceptor(dst_id);
dst_interceptor->EnqueueRemoteInterceptorMessage(interceptor_message);
return true;
}
Interceptor* Carrier::GetInterceptor(int64_t interceptor_id) {
auto iter = interceptor_idx_to_interceptor_.find(interceptor_id);
PADDLE_ENFORCE_NE(iter, interceptor_idx_to_interceptor_.end(),
platform::errors::InvalidArgument(
"Cannot find interceptor instance for interceptor "
"id %lld. Wrong dst? Call before init?",
interceptor_id));
return iter->second.get();
}
void Carrier::Wait() {
std::unique_lock<std::mutex> lock(running_mutex_);
cond_var_.wait(lock);
}
void Carrier::WakeUp() {
// probably double notify, but ok for ut
cond_var_.notify_all();
}
void Carrier::Start() {
PADDLE_ENFORCE_EQ(is_init_, true, platform::errors::PreconditionNotMet(
"Using carrier before initialized."));
for (int64_t id : source_interceptor_ids_) {
VLOG(3) << "Carrier Start is sending start to source interceptor " << id
<< ".";
InterceptorMessage start_msg;
// source node data_is_ready is send by carrier, so set src_id=-1
start_msg.set_src_id(-1);
start_msg.set_dst_id(id);
start_msg.set_message_type(DATA_IS_READY);
Send(start_msg);
}
// TODO(wangxi): async step
Wait();
dev_ctx_->Wait();
for (auto* micro_scope : microbatch_scopes_) {
// By default, we should delete all kid scopes after run executor because
// some operators may create local scope when running, such as while_op.
// But when while_op also create a local executor to run it's sub block,
// the sub scopes it created should not be dropped immediately, because
// while_grad_op will use some variables created during while_op run, so
// we need to keep the kids and wait for the outer executor to drop them.
micro_scope->DropKids();
}
}
bool Carrier::IsInit() const { return is_init_; }
int64_t Carrier::GetRank(int64_t interceptor_id) const {
PADDLE_ENFORCE_NE(
interceptor_id_to_rank_.find(interceptor_id),
interceptor_id_to_rank_.end(),
platform::errors::NotFound("Cannot find rank for interceptor id %lld.",
interceptor_id));
return interceptor_id_to_rank_.at(interceptor_id);
}
bool Carrier::Send(const InterceptorMessage& msg) {
int64_t src_id = msg.src_id();
// TODO(liyurui): compatible solution, will be removed completely in the
// future
if (interceptor_id_to_rank_.find(src_id) == interceptor_id_to_rank_.end() &&
src_id == SOURCE_ID) {
src_id = msg.dst_id();
}
int64_t dst_id = msg.dst_id();
int64_t src_rank = GetRank(src_id);
int64_t dst_rank = GetRank(dst_id);
PADDLE_ENFORCE_EQ(
src_rank, rank_,
platform::errors::Fatal("The source rank id %lld, which is not equal to "
"the carrier rank id %lld.",
src_rank, rank_));
if (src_rank == dst_rank) {
VLOG(3) << "Send a message from interceptor " << src_id
<< " to interceptor " << dst_id << ", which are in the same ranks.";
return EnqueueInterceptorMessage(msg);
} else {
VLOG(3) << "Send a message from interceptor " << src_id
<< " to interceptor " << dst_id
<< ", which are in different ranks.";
return GlobalVal<MessageBus>::Get()->Send(dst_rank, msg);
}
}
Interceptor* Carrier::SetInterceptor(int64_t interceptor_id,
std::unique_ptr<Interceptor> interceptor) {
auto iter = interceptor_idx_to_interceptor_.find(interceptor_id);
PADDLE_ENFORCE_EQ(iter, interceptor_idx_to_interceptor_.end(),
platform::errors::AlreadyExists(
"The interceptor id %lld has already been created! "
"The interceptor id should be unique.",
interceptor_id));
interceptor->RegisterCarrier(this);
// TODO(fleet_exe dev): get loop
auto* loop = thread_pool_.GetLoop(interceptor_id % thread_num_);
PADDLE_ENFORCE_NOT_NULL(
loop, platform::errors::Fatal("thread task loop must not null"));
interceptor->RegisterTaskLoop(loop);
auto* ptr = interceptor.get();
interceptor_idx_to_interceptor_.insert(
std::make_pair(interceptor_id, std::move(interceptor)));
return ptr;
}
static std::shared_ptr<framework::GarbageCollector> GetGC(
const platform::Place& place) {
int64_t max_memory_size = framework::GetEagerDeletionThreshold();
std::shared_ptr<framework::GarbageCollector> gc;
if (max_memory_size >= 0) {
#if defined(PADDLE_WITH_CUDA) || defined(PADDLE_WITH_HIP)
if (platform::is_gpu_place(place)) {
if (framework::IsFastEagerDeletionModeEnabled()) {
gc.reset(new framework::UnsafeFastGPUGarbageCollector(place,
max_memory_size));
}
}
#endif
} // max_memory_size >= 0
return gc;
}
void Carrier::CreateInterceptors() {
if (interceptor_id_to_node_.empty()) return;
auto gc = GetGC(place_);
// create each Interceptor
// no auto init since there is no config
for (const auto& item : interceptor_id_to_node_) {
int64_t interceptor_id = item.first;
TaskNode* task_node = item.second;
PADDLE_ENFORCE_LT(
task_node->run_at_offset(), task_node->run_per_steps(),
platform::errors::InvalidArgument(
"Interceptor's run_at_offset must < run_per_steps, must now "
"run_at_offset=%ld run_per_steps=%ld",
task_node->run_at_offset(), task_node->run_per_steps()));
std::unique_ptr<Interceptor> interceptor;
PADDLE_ENFORCE_NE(task_node->type().empty(), true,
platform::errors::NotFound(
"Cannot found type for task node with id %lld",
task_node->task_id()));
interceptor = InterceptorFactory::Create(task_node->type(), interceptor_id,
task_node);
interceptor->SetPlace(place_);
interceptor->SetMiniBatchScope(minibatch_scope_);
interceptor->SetMicroBatchScope(microbatch_scopes_);
interceptor->SetRootScope(root_scope_);
interceptor->SetGC(gc);
SetInterceptor(interceptor_id, std::move(interceptor));
VLOG(3) << "Create Interceptor with interceptor id: " << interceptor_id
<< " with type: " << task_node->type() << ".";
if (task_node->upstream().empty()) {
source_interceptor_ids_.emplace_back(interceptor_id);
}
}
}
} // namespace distributed
} // namespace paddle