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https://gitlab.kitware.com/vtk/vtk-m
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64e3e8f344
A device can fail during startup of vtk-m or mid execution due to issues such as OOM. Timer needs to be able to handle these situations gracefully
93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#ifndef vtk_m_cont_Timer_h
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#define vtk_m_cont_Timer_h
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#include <vtkm/List.h>
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#include <vtkm/cont/DeviceAdapter.h>
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#include <vtkm/cont/DeviceAdapterList.h>
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#include <vtkm/cont/vtkm_cont_export.h>
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#include <memory>
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namespace vtkm
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{
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namespace cont
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{
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namespace detail
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{
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struct EnabledDeviceTimerImpls;
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}
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/// A class that can be used to time operations in VTK-m that might be occuring
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/// in parallel. Users are recommended to provide a device adapter at construction
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/// time which matches the one being used to execute algorithms to ensure that thread
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/// synchronization is correct and accurate.
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/// If no device adapter is provided at construction time, the maximum
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/// elapsed time of all enabled deivces will be returned. Normally cuda is expected to
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/// have the longest execution time if enabled.
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/// Per device adapter time query is also supported. It's useful when users want to reuse
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/// the same timer to measure the cuda kernal call as well as the cuda device execution.
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/// It is also possible to change the device adapter after construction by calling the form
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/// of the Reset method with a new DeviceAdapterId.
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///
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/// The there is no guaranteed resolution of the time but should generally be
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/// good to about a millisecond.
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///
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class VTKM_CONT_EXPORT Timer
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{
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public:
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VTKM_CONT
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Timer();
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VTKM_CONT Timer(vtkm::cont::DeviceAdapterId device);
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VTKM_CONT ~Timer();
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/// Resets the timer.
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VTKM_CONT void Reset();
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/// Resets the timer and changes the device to time on.
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VTKM_CONT void Reset(vtkm::cont::DeviceAdapterId device);
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VTKM_CONT void Start();
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VTKM_CONT void Stop();
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VTKM_CONT bool Started() const;
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VTKM_CONT bool Stopped() const;
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/// Used to check if Timer has finished the synchronization to get the result from the device.
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VTKM_CONT bool Ready() const;
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/// Get the elapsed time measured by the given device adapter. If no device is
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/// specified, the max time of all device measurements will be returned.
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VTKM_CONT
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vtkm::Float64 GetElapsedTime() const;
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/// Returns the device for which this timer is synchronized. If the device adapter has the same
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/// id as DeviceAdapterTagAny, then the timer will synchronize all devices.
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VTKM_CONT vtkm::cont::DeviceAdapterId GetDevice() const { return this->Device; }
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private:
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/// Some timers are ill-defined when copied, so disallow that for all timers.
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VTKM_CONT Timer(const Timer&) = delete;
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VTKM_CONT void operator=(const Timer&) = delete;
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DeviceAdapterId Device;
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std::unique_ptr<detail::EnabledDeviceTimerImpls> Internal;
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};
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}
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} // namespace vtkm::cont
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#endif //vtk_m_cont_Timer_h
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