experiments/STT-tensorflow
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Disable tensor tracking when only one GPU stream is used.

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Change: 113579306
This commit is contained in:
Xiaoqiang Zheng 2016-02-01 16:10:52 -08:00 committed by Manjunath Kudlur
parent 45bb3fdcab
commit d821f6aeb6
4 changed files with 37 additions and 13 deletions
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7
tensorflow/core/common_runtime/gpu/gpu_device.cc
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@ -207,6 +207,13 @@ BaseGPUDevice::~BaseGPUDevice() {
gtl::STLDeleteElements(&streams_);
}
bool BaseGPUDevice::RequiresRecordingAccessedTensors() const {
// When there is no more than one stream, we release the tensor reference
// at the end of the kernel launch, instead of at the end of the kernel
// execution.
return streams_.size() > 1;
}
Status BaseGPUDevice::FillContextMap(const Graph* graph,
DeviceContextMap* device_context_map) {
VLOG(2) << "FillContextMap";

2
tensorflow/core/common_runtime/gpu/gpu_device.h
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@ -51,7 +51,7 @@ class BaseGPUDevice : public LocalDevice {
// GPU devices require the Op Compute method to save a reference to
// any temporary tensors that are allocated until the Op execution
// completes.
bool RequiresRecordingAccessedTensors() const override { return true; }
bool RequiresRecordingAccessedTensors() const override;
void ConsumeListOfAccessedTensors(
DeviceContext* device_context,

37
tensorflow/core/common_runtime/gpu/gpu_util.cc
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@ -173,9 +173,9 @@ void GPUUtil::DeviceToDeviceCopy(DeviceContext* send_dev_context,
const Tensor* input, Tensor* output,
StatusCallback done) {
const DeviceBase::GpuDeviceInfo* dev_info = nullptr;
gpu::Stream* stream = nullptr;
Status s =
PrepareCopy(src, send_dev_context, *input, output, &dev_info, &stream);
gpu::Stream* send_stream = nullptr;
Status s = PrepareCopy(src, send_dev_context, *input, output, &dev_info,
&send_stream);
if (!s.ok()) {
done(s);
return;
@ -187,20 +187,33 @@ void GPUUtil::DeviceToDeviceCopy(DeviceContext* send_dev_context,
DeviceMemoryBase gpu_src_ptr(src_ptr, total_bytes);
void* dst_ptr = GetBase(output);
DeviceMemoryBase gpu_dst_ptr(dst_ptr, total_bytes);
// Since we want to use the memory from recv_stream in the send_stream,
// add a dependency to make sure the memory is truely free.
// TODO(zhengxq): remove this dependency when we switch to a better way
// to make sure the memory is free.
auto recv_stream =
static_cast<const GPUDeviceContext*>(recv_dev_context)->stream();
if (recv_stream == nullptr) {
done(errors::Internal("No recv gpu stream is available."));
return;
}
send_stream->ThenWaitFor(recv_stream);
VLOG(2) << "src_ptr " << src_ptr << " dst_ptr " << dst_ptr;
stream->ThenMemcpy(&gpu_dst_ptr, gpu_src_ptr, total_bytes);
send_stream->ThenMemcpy(&gpu_dst_ptr, gpu_src_ptr, total_bytes);
}
// Use of input may outlive stack scope, so keep a ref.
TensorReference input_ref(*input);
dev_info->event_mgr->ThenExecute(stream, [done, stream, input_ref]() {
input_ref.Unref();
if (!stream->ok()) {
LOG(FATAL) << "GPU->GPU Memcpy failed";
}
done(Status::OK());
});
send_dev_context->MaintainLifetimeOnStream(input, stream);
dev_info->event_mgr->ThenExecute(send_stream,
[done, send_stream, input_ref]() {
input_ref.Unref();
if (!send_stream->ok()) {
LOG(FATAL) << "GPU->GPU Memcpy failed";
}
done(Status::OK());
});
send_dev_context->MaintainLifetimeOnStream(input, send_stream);
}
static CopyTensor::Registration register_gpu_gpu_copy(

4
tensorflow/core/kernels/conv_ops_gpu.h
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@ -67,6 +67,9 @@ class CudnnScratchAllocator : public perftools::gputools::ScratchAllocator {
perftools::gputools::DeviceMemory<uint8>>(
AsDeviceMemory<uint8>(nullptr, 0));
}
// Hold the reference of the allocated tensors until the end of the
// allocator.
allocated_tensors_.push_back(temporary_memory);
return perftools::gputools::port::StatusOr<
perftools::gputools::DeviceMemory<uint8>>(
AsDeviceMemory(temporary_memory.flat<uint8>().data(),
@ -76,6 +79,7 @@ class CudnnScratchAllocator : public perftools::gputools::ScratchAllocator {
private:
int64 memory_limit_;
OpKernelContext* context_;
std::vector<Tensor> allocated_tensors_;
};
} // namespace tensorflow