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#include "caffe2/core/context_gpu.h"
#include "caffe2/core/event_cpu.h"
#include "caffe2/core/operator.h"
#include <atomic>
#include <iostream>
namespace caffe2 {
struct CudaEventWrapper {
explicit CudaEventWrapper(const DeviceOption& option)
: cuda_stream_(nullptr),
device_id_(option.device_id()),
status_(EventStatus::EVENT_INITIALIZED) {
CAFFE_ENFORCE(option.device_type(), PROTO_CUDA);
CUDAGuard g(device_id_);
try {
CUDA_ENFORCE(cudaEventCreateWithFlags(
&cuda_event_, cudaEventDefault | cudaEventDisableTiming));
} catch (const Error&) {
std::cerr << "ERROR: Failed to load CUDA.\n"
<< "HINT: Check that this binary contains GPU code."
<< std::endl;
throw;
}
}
~CudaEventWrapper() {
CUDAGuard g(device_id_);
CUDA_CHECK(cudaEventDestroy(cuda_event_));
}
cudaEvent_t cuda_event_;
cudaStream_t cuda_stream_;
int device_id_;
std::atomic<int> status_;
std::mutex mutex_recorded_;
std::condition_variable cv_recorded_;
std::string err_msg_;
};
namespace {
const std::string kNoError = "No error";
}
void EventCreateCUDA(const DeviceOption& option, Event* event) {
event->event_ = std::make_shared<CudaEventWrapper>(option);
}
void EventRecordCUDA(Event* event, const void* context, const char* err_msg) {
auto* wrapper = static_cast<CudaEventWrapper*>(event->event_.get());
{
std::unique_lock<std::mutex> lock(wrapper->mutex_recorded_);
// Possible state changes:
// INITIALIZED -> SCHEDULED/FAILED
// SCHEDULED -> SUCCESS/FAILED
// SUCCESS/FAILED - terminal
//
// No further changes to cuda_event_ and cuda_stream_ after transitioning
// from INITIALIZED
// No further changes to err_msg_ after transitioning into FAILED
CAFFE_ENFORCE_EQ(
wrapper->status_,
EventStatus::EVENT_INITIALIZED,
"Calling Record multiple times");
if (!err_msg) {
// When recording, one needs to make sure that the current gpu id is
// correct.
// TODO(jiayq): move the enforce logic to the caller?
const auto& current_device = CaffeCudaGetDevice();
CAFFE_ENFORCE_EQ(
current_device,
wrapper->device_id_,
"When you call EventRecordCUDA, your current device should be the same "
"as the device specified by the event.");
CAFFE_ENFORCE_EQ(
current_device,
static_cast<const CUDAContext*>(context)->device_id());
CUDA_ENFORCE(cudaEventRecord(
wrapper->cuda_event_,
static_cast<const CUDAContext*>(context)->cuda_stream()));
wrapper->cuda_stream_ =
static_cast<const CUDAContext*>(context)->cuda_stream();
wrapper->status_ = EventStatus::EVENT_SCHEDULED;
} else {
wrapper->err_msg_ = err_msg;
wrapper->status_ = EventStatus::EVENT_FAILED;
}
}
wrapper->cv_recorded_.notify_all();
}
void EventFinishCUDA(const Event* event) {
auto* wrapper = static_cast<CudaEventWrapper*>(event->event_.get());
{
std::unique_lock<std::mutex> lock(wrapper->mutex_recorded_);
while (wrapper->status_ == EventStatus::EVENT_INITIALIZED) {
wrapper->cv_recorded_.wait(lock);
}
}
if (wrapper->status_ == EventStatus::EVENT_SCHEDULED) {
// ok, even if event is already completed and status was not yet updated
CUDAGuard g(wrapper->device_id_);
auto cudaResult = cudaEventSynchronize(wrapper->cuda_event_);
if (cudaResult == cudaSuccess) {
wrapper->status_ = EventStatus::EVENT_SUCCESS;
} else {
const auto& err_msg = cudaGetErrorString(cudaResult);
std::unique_lock<std::mutex> lock(wrapper->mutex_recorded_);
wrapper->err_msg_ = err_msg;
wrapper->status_ = EventStatus::EVENT_FAILED;
}
}
}
// Both waiter and event are CUDA. Non-blocking
void EventWaitCUDACUDA(const Event* event, void* context) {
auto* wrapper = static_cast<CudaEventWrapper*>(event->event_.get());
{
std::unique_lock<std::mutex> lock(wrapper->mutex_recorded_);
while (wrapper->status_ == EventStatus::EVENT_INITIALIZED) {
wrapper->cv_recorded_.wait(lock);
}
}
if (wrapper->status_ == EventStatus::EVENT_SCHEDULED) {
// ok, even if event is already completed and status was not yet updated
auto context_stream = static_cast<CUDAContext*>(context)->cuda_stream();
auto event_stream = wrapper->cuda_stream_;
if (context_stream != event_stream) {
// CAFFE_ENFORCE_EQ(
// CaffeCudaGetDevice(),
// static_cast<const CUDAContext*>(context)->device_id());
CUDA_CHECK(cudaStreamWaitEvent(context_stream, wrapper->cuda_event_, 0));
}
}
}
// Waiter is CPU, event is CUDA
void EventWaitCPUCUDA(const Event* event, void* context) {
EventFinishCUDA(event);
}
// Waiter is CUDA, event is CPU
void EventWaitCUDACPU(const Event* event, void* context) {
event->Finish(); // calls EventFinishCPU
}
EventStatus EventQueryCUDA(const Event* event) {
auto* wrapper = static_cast<CudaEventWrapper*>(event->event_.get());
if (wrapper->status_ == EventStatus::EVENT_SCHEDULED) {
auto cudaResult = cudaEventQuery(wrapper->cuda_event_);
if (cudaResult == cudaSuccess) {
wrapper->status_ = EventStatus::EVENT_SUCCESS;
} else if (cudaResult != cudaErrorNotReady) {
const auto& err_msg = cudaGetErrorString(cudaResult);
std::unique_lock<std::mutex> lock(wrapper->mutex_recorded_);
wrapper->err_msg_ = err_msg;
wrapper->status_ = EventStatus::EVENT_FAILED;
} else {
// ignore and clear the error if not ready
(void)cudaGetLastError();
}
}
return static_cast<EventStatus>(wrapper->status_.load());
}
const std::string& EventErrorMessageCUDA(const Event* event) {
auto* wrapper = static_cast<CudaEventWrapper*>(event->event_.get());
// supposed to be called after EventQueryCUDA to update status first
if (wrapper->status_ == EventStatus::EVENT_FAILED) {
return wrapper->err_msg_;
} else {
return kNoError;
}
}
void EventSetFinishedCUDA(const Event* event, const char* err_msg) {
auto* wrapper = static_cast<CudaEventWrapper*>(event->event_.get());
{
std::unique_lock<std::mutex> lock(wrapper->mutex_recorded_);
CAFFE_ENFORCE_EQ(
wrapper->status_,
EventStatus::EVENT_INITIALIZED,
"Calling SetFinished on recorded CUDA event");
if (!err_msg) {
wrapper->status_ = EventStatus::EVENT_SUCCESS;
} else {
wrapper->err_msg_ = err_msg;
wrapper->status_ = EventStatus::EVENT_FAILED;
}
}
wrapper->cv_recorded_.notify_all();
}
void EventResetCUDA(Event* event) {
auto* wrapper = static_cast<CudaEventWrapper*>(event->event_.get());
std::unique_lock<std::mutex> lock(wrapper->mutex_recorded_);
wrapper->status_ = EventStatus::EVENT_INITIALIZED;
wrapper->err_msg_ = "";
wrapper->cuda_stream_ = nullptr;
}
REGISTER_EVENT_CREATE_FUNCTION(CUDA, EventCreateCUDA);
REGISTER_EVENT_RECORD_FUNCTION(CUDA, EventRecordCUDA);
REGISTER_EVENT_WAIT_FUNCTION(CUDA, CUDA, EventWaitCUDACUDA);
REGISTER_EVENT_WAIT_FUNCTION(CPU, CUDA, EventWaitCPUCUDA);
REGISTER_EVENT_WAIT_FUNCTION(CUDA, CPU, EventWaitCUDACPU);
REGISTER_EVENT_FINISH_FUNCTION(CUDA, EventFinishCUDA);
REGISTER_EVENT_QUERY_FUNCTION(CUDA, EventQueryCUDA);
REGISTER_EVENT_ERROR_MESSAGE_FUNCTION(CUDA, EventErrorMessageCUDA);
REGISTER_EVENT_SET_FINISHED_FUNCTION(CUDA, EventSetFinishedCUDA);
REGISTER_EVENT_RESET_FUNCTION(CUDA, EventResetCUDA);
REGISTER_EVENT_WAIT_FUNCTION(MKLDNN, CUDA, EventWaitCPUCUDA);
REGISTER_EVENT_WAIT_FUNCTION(CUDA, MKLDNN, EventWaitCUDACPU);
} // namespace caffe2
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