tensorflow/core/common_runtime/permuter.cc

/* Copyright 2020 The TensorFlow 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 "tensorflow/core/common_runtime/permuter.h"

#include "tensorflow/core/common_runtime/collective_rma_local.h"
#include "tensorflow/core/common_runtime/collective_util.h"
#include "tensorflow/core/common_runtime/copy_tensor.h"
#include "tensorflow/core/common_runtime/device.h"
#include "tensorflow/core/common_runtime/device_mgr.h"
#include "tensorflow/core/common_runtime/dma_helper.h"
#include "tensorflow/core/common_runtime/process_util.h"
#include "tensorflow/core/framework/allocator.h"
#include "tensorflow/core/framework/device_base.h"
#include "tensorflow/core/framework/op_kernel.h"
#include "tensorflow/core/framework/tensor.h"
#include "tensorflow/core/framework/types.h"
#include "tensorflow/core/lib/core/errors.h"
#include "tensorflow/core/lib/core/notification.h"
#include "tensorflow/core/lib/core/status.h"
#include "tensorflow/core/lib/strings/str_util.h"
#include "tensorflow/core/lib/strings/strcat.h"
#include "tensorflow/core/platform/env.h"
#include "tensorflow/core/platform/types.h"

namespace tensorflow {

Permuter::Permuter()
    : col_ctx_(nullptr), col_params_(nullptr), done_(nullptr), counter_(0) {}

bool Permuter::CheckCounter() {
  mutex_lock lock(mu_counter_);
  ++counter_;
  if (counter_ == 2) return true;
  return false;
}

StatusCallback Permuter::HalfDone() {
  return [this](const Status& s) {
    status_.Update(s);
    if (CheckCounter()) done_(status_);
  };
}

Status Permuter::InitializeCollectiveContext(
    std::shared_ptr<CollectiveContext> col_ctx) {
  DCHECK(col_ctx->dev_mgr);
  col_ctx_ = col_ctx;
  col_params_ = &col_ctx->col_params;
  return collective_util::InitializeDeviceAndLocality(
      col_ctx->dev_mgr, col_ctx->device_name, &col_ctx->device,
      &col_ctx->device_locality);
}

void Permuter::Run(StatusCallback done) {
  done_ = std::move(done);
  for (int i = 0; i < col_params_->instance.devices.size(); ++i) {
    if (col_ctx_->device_name == col_params_->instance.devices[i]) {
      DispatchSend(i, col_params_->instance.permutation[i], col_ctx_->input,
                   HalfDone());
      continue;
    }
    if (col_ctx_->device_name ==
        col_params_->instance.devices[col_params_->instance.permutation[i]]) {
      DispatchRecv(i, col_params_->instance.permutation[i], col_ctx_->output,
                   HalfDone());
    }
  }
}

void Permuter::DispatchSend(int src_rank, int target_rank, const Tensor* tensor,
                            const StatusCallback& done) {
  string send_buf_key =
      strings::StrCat(col_ctx_->exec_key, src_rank, target_rank);
  VLOG(1) << "DispatchSend " << send_buf_key << " from_device "
          << col_ctx_->device_name << " to_device "
          << col_params_->instance.devices[target_rank]
          << " target_rank=" << target_rank << " src_rank=" << src_rank;
  col_ctx_->col_exec->PostToPeer(col_params_->instance.devices[target_rank],
                                 col_params_->instance.task_names[target_rank],
                                 send_buf_key, col_ctx_->device,
                                 col_ctx_->op_ctx->op_device_context(),
                                 col_ctx_->op_ctx->output_alloc_attr(0), tensor,
                                 col_ctx_->device_locality, done);
}

void Permuter::DispatchRecv(int src_rank, int target_rank, Tensor* tensor,
                            const StatusCallback& done) {
  string recv_buf_key =
      strings::StrCat(col_ctx_->exec_key, src_rank, target_rank);
  VLOG(1) << "DispatchRecv " << recv_buf_key << " to_device "
          << col_ctx_->device_name << " from_device "
          << col_params_->instance.devices[src_rank]
          << " target_rank=" << target_rank << " src_rank=" << src_rank;
  col_ctx_->col_exec->RecvFromPeer(col_params_->instance.devices[src_rank],
                                   col_params_->instance.task_names[src_rank],
                                   col_params_->task.is_local[src_rank],
                                   recv_buf_key, col_ctx_->device,
                                   col_ctx_->op_ctx->op_device_context(),
                                   col_ctx_->op_ctx->output_alloc_attr(0),
                                   tensor, col_ctx_->device_locality, 0, done);
}
namespace {
REGISTER_COLLECTIVE(Permute, Permuter);
}  // namespace

}  // namespace tensorflow