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fusion_buffer_manager.cc
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fusion_buffer_manager.cc
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// Copyright 2018 Uber Technologies, Inc. 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 "fusion_buffer_manager.h"
namespace horovod {
namespace common {
Status FusionBufferManager::InitializeBuffer(int64_t threshold, int device, std::shared_ptr<OpContext> context,
std::function<void()> on_start_init,
std::function<void()> on_end_init) {
auto& elem = tensor_fusion_buffers_[std::make_tuple(device, context->framework())];
auto& buffer = elem.first;
int64_t& size = elem.second;
if (size != threshold) {
buffer.reset();
size = 0;
}
if (buffer == nullptr) {
on_start_init();
size = threshold;
// Lazily allocate persistent buffer for Tensor Fusion and keep it
// forever per device.
Status status = context->AllocatePersistent(threshold, &buffer);
on_end_init();
return status;
}
return Status::OK();
}
std::shared_ptr<PersistentBuffer>& FusionBufferManager::GetBuffer(int device, Framework framework) {
return tensor_fusion_buffers_[std::make_tuple(device, framework)].first;
}
} // namespace common
} // namespace horovod