mirror of
https://gitlab.kitware.com/vtk/vtk-m
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5b8c282e9f
These changes complete the using part of the guide.
257 lines
9.3 KiB
C++
257 lines
9.3 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_RuntimeDeviceTracker_h
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#define vtk_m_cont_RuntimeDeviceTracker_h
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#include <vtkm/cont/vtkm_cont_export.h>
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#include <vtkm/cont/DeviceAdapterTag.h>
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#include <vtkm/cont/ErrorBadAllocation.h>
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#include <vtkm/cont/ErrorBadDevice.h>
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#include <vtkm/cont/RuntimeDeviceInformation.h>
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#include <functional>
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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 RuntimeDeviceTrackerInternals;
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}
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class ScopedRuntimeDeviceTracker;
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/// RuntimeDeviceTracker is the central location for determining
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/// which device adapter will be active for algorithm execution.
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/// Many features in VTK-m will attempt to run algorithms on the "best
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/// available device." This generally is determined at runtime as some
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/// backends require specific hardware, or failures in one device are
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/// recorded and that device is disabled.
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///
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/// While vtkm::cont::RunimeDeviceInformation reports on the existence
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/// of a device being supported, this tracks on a per-thread basis
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/// when worklets fail, why the fail, and will update the list
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/// of valid runtime devices based on that information.
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///
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///
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class VTKM_CONT_EXPORT RuntimeDeviceTracker
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{
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friend VTKM_CONT_EXPORT vtkm::cont::RuntimeDeviceTracker& GetRuntimeDeviceTracker();
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public:
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VTKM_CONT
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~RuntimeDeviceTracker();
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/// Returns true if the given device adapter is supported on the current
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/// machine.
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///
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VTKM_CONT bool CanRunOn(DeviceAdapterId deviceId) const;
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/// Report a failure to allocate memory on a device, this will flag the
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/// device as being unusable for all future invocations.
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///
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VTKM_CONT void ReportAllocationFailure(vtkm::cont::DeviceAdapterId deviceId,
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const vtkm::cont::ErrorBadAllocation&)
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{
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this->SetDeviceState(deviceId, false);
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}
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/// Report a ErrorBadDevice failure and flag the device as unusable.
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VTKM_CONT void ReportBadDeviceFailure(vtkm::cont::DeviceAdapterId deviceId,
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const vtkm::cont::ErrorBadDevice&)
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{
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this->SetDeviceState(deviceId, false);
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}
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/// Reset the tracker for the given device. This will discard any updates
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/// caused by reported failures. Passing DeviceAdapterTagAny to this will
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/// reset all devices (same as `Reset()`).
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///
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VTKM_CONT void ResetDevice(vtkm::cont::DeviceAdapterId deviceId);
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/// Reset the tracker to its default state for default devices.
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/// Will discard any updates caused by reported failures.
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///
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VTKM_CONT
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void Reset();
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/// @brief Disable the given device.
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///
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/// The main intention of `RuntimeDeviceTracker` is to keep track of what
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/// devices are working for VTK-m. However, it can also be used to turn
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/// devices on and off. Use this method to disable (turn off) a given device.
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/// Use `ResetDevice()` to turn the device back on (if it is supported).
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///
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/// Passing DeviceAdapterTagAny to this will disable all devices.
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///
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VTKM_CONT void DisableDevice(DeviceAdapterId deviceId);
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/// \brief Disable all devices except the specified one.
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///
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/// The main intention of `RuntimeDeviceTracker` is to keep track of what
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/// devices are working for VTK-m. However, it can also be used to turn
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/// devices on and off. Use this method to disable all devices except one
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/// to effectively force VTK-m to use that device. Either pass the
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/// DeviceAdapterTagAny to this function or call `Reset()` to restore
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/// all devices to their default state.
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///
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/// This method will throw a `vtkm::cont::ErrorBadValue` if the given device
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/// does not exist on the system.
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///
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VTKM_CONT void ForceDevice(DeviceAdapterId deviceId);
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/// @brief Get/Set use of thread-friendly memory allocation for a device.
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///
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///
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VTKM_CONT bool GetThreadFriendlyMemAlloc() const;
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/// @copydoc GetThreadFriendlyMemAlloc
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VTKM_CONT void SetThreadFriendlyMemAlloc(bool state);
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/// @brief Copies the state from the given device.
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///
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/// This is a convenient way to allow the `RuntimeDeviceTracker` on one thread
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/// copy the behavior from another thread.
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///
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VTKM_CONT void CopyStateFrom(const vtkm::cont::RuntimeDeviceTracker& tracker);
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/// @brief Set/Clear the abort checker functor.
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///
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/// If set the abort checker functor is called by `vtkm::cont::TryExecute()`
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/// before scheduling a task on a device from the associated the thread. If
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/// the functor returns `true`, an exception is thrown.
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VTKM_CONT void SetAbortChecker(const std::function<bool()>& func);
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/// @copydoc SetAbortChecker
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VTKM_CONT void ClearAbortChecker();
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VTKM_CONT bool CheckForAbortRequest() const;
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/// @brief Produce a human-readable report on the state of the runtime device tracker.
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VTKM_CONT void PrintSummary(std::ostream& out) const;
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private:
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friend class ScopedRuntimeDeviceTracker;
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detail::RuntimeDeviceTrackerInternals* Internals;
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VTKM_CONT
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RuntimeDeviceTracker(detail::RuntimeDeviceTrackerInternals* details, bool reset);
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VTKM_CONT
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RuntimeDeviceTracker(const RuntimeDeviceTracker&) = delete;
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VTKM_CONT
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RuntimeDeviceTracker& operator=(const RuntimeDeviceTracker&) = delete;
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VTKM_CONT
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void CheckDevice(vtkm::cont::DeviceAdapterId deviceId) const;
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VTKM_CONT
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void SetDeviceState(vtkm::cont::DeviceAdapterId deviceId, bool state);
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VTKM_CONT
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void LogEnabledDevices() const;
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};
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///----------------------------------------------------------------------------
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/// \brief Get the \c RuntimeDeviceTracker for the current thread.
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///
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/// Many features in VTK-m will attempt to run algorithms on the "best
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/// available device." This often is determined at runtime as failures in
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/// one device are recorded and that device is disabled. To prevent having
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/// to check over and over again, VTK-m uses per thread runtime device tracker
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/// so that these choices are marked and shared.
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///
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VTKM_CONT_EXPORT
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VTKM_CONT
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vtkm::cont::RuntimeDeviceTracker& GetRuntimeDeviceTracker();
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/// @brief Identifier used to specify whether to enable or disable a particular device.
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enum struct RuntimeDeviceTrackerMode
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{
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// Documentation is below (for better layout in generated documents).
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Force,
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Enable,
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Disable
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};
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/// @var RuntimeDeviceTrackerMode Force
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/// @brief Replaces the current list of devices to try with the device specified.
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///
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/// This has the effect of forcing VTK-m to use the provided device.
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/// This is the default behavior for `vtkm::cont::ScopedRuntimeDeviceTracker`.
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/// @var RuntimeDeviceTrackerMode Enable
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/// @brief Adds the provided device adapter to the list of devices to try.
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/// @var RuntimeDeviceTrackerMode Disable
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/// @brief Removes the provided device adapter from the list of devices to try.
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//----------------------------------------------------------------------------
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/// A class to create a scoped runtime device tracker object. This object captures the state
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/// of the per-thread device tracker and will revert any changes applied
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/// during its lifetime on destruction.
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///
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class VTKM_CONT_EXPORT ScopedRuntimeDeviceTracker : public vtkm::cont::RuntimeDeviceTracker
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{
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public:
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/// Construct a ScopedRuntimeDeviceTracker associated with the thread,
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/// associated with the provided tracker (defaults to current thread's tracker).
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///
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/// Any modifications to the ScopedRuntimeDeviceTracker will effect what
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/// ever thread the \c tracker is associated with, which might not be
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/// the thread on which the ScopedRuntimeDeviceTracker was constructed.
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///
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/// Constructors are not thread safe
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/// @{
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///
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VTKM_CONT ScopedRuntimeDeviceTracker(
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const vtkm::cont::RuntimeDeviceTracker& tracker = GetRuntimeDeviceTracker());
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/// Use this constructor to modify the state of the device adapters associated with
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/// the provided tracker. Use \p mode with \p device as follows:
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///
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/// 'Force' (default)
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/// - Force-Enable the provided single device adapter
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/// - Force-Enable all device adapters when using vtkm::cont::DeviceAdaterTagAny
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/// 'Enable'
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/// - Enable the provided single device adapter if it was previously disabled
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/// - Enable all device adapters that are currently disabled when using
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/// vtkm::cont::DeviceAdaterTagAny
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/// 'Disable'
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/// - Disable the provided single device adapter
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/// - Disable all device adapters when using vtkm::cont::DeviceAdaterTagAny
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///
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VTKM_CONT ScopedRuntimeDeviceTracker(
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vtkm::cont::DeviceAdapterId device,
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RuntimeDeviceTrackerMode mode = RuntimeDeviceTrackerMode::Force,
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const vtkm::cont::RuntimeDeviceTracker& tracker = GetRuntimeDeviceTracker());
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/// Use this constructor to set the abort checker functor for the provided tracker.
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///
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VTKM_CONT ScopedRuntimeDeviceTracker(
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const std::function<bool()>& abortChecker,
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const vtkm::cont::RuntimeDeviceTracker& tracker = GetRuntimeDeviceTracker());
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/// Destructor is not thread safe
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VTKM_CONT ~ScopedRuntimeDeviceTracker();
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private:
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std::unique_ptr<detail::RuntimeDeviceTrackerInternals> SavedState;
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};
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}
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} // namespace vtkm::cont
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#endif //vtk_m_cont_RuntimeDeviceTracker_h
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