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VTK-m Project Goals A single place for the visualization community to collaborate, contribute, and leverage massively threaded algorithms. Reduce the challenges.

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Presentation on theme: "VTK-m Project Goals A single place for the visualization community to collaborate, contribute, and leverage massively threaded algorithms. Reduce the challenges."— Presentation transcript:

1 VTK-m Project Goals A single place for the visualization community to collaborate, contribute, and leverage massively threaded algorithms. Reduce the challenges of writing highly concurrent algorithms by using data parallel algorithms

2 VTK-m Project Goals Make it easier for simulation codes to take advantage these parallel visualization and analysis tasks on a wide range of current and next-generation hardware.

3 VTK-m Architecture In-Situ Execution Data Parallel Algorithms Arrays Post Processing Worklets DataModel Filters Combines strengths of multiple projects: –EAVL, Oak Ridge National Laboratory –DAX, Sandia National Laboratory –PISTON, Los Alamos National Laboratory

4 VTK-m Arbitrary Composition VTK-m allows clients to access different memory layouts through the Array Handle and Dynamic Array Handle. – Allows for efficient in-situ integration – Allows for reduced data transfer Control EnvironmentExecution Environment Transfer Control EnvironmentExecution Environment

5 VTK-m Arbitrary Composition Point Arrangement Cells CoordinatesExplicitLogicalImplicit Structured Strided Separated Unstructured Strided Separated VTK-m Data Set VTK-m allows clients to construct data sets from cell and point arrangements that exactly match their original data – In effect, this allows for hybrid and novel mesh types

6 functor() Functor Mapping Applied to Topologies [Baker, et al. 2010]

7 functor() Functor Mapping Applied to Topologies [Baker, et al. 2010]

8 What We Have So Far Features –Core Types –Statically Typed Arrays –Dynamically Typed Arrays –Device Interface (Serial, Cuda, TBB) –Data Model –Field and Topology Worklet and Dispatcher

9 What We Have So Far Compiles with –gcc (4.8+), clang, msvc (2010+), icc, and pgi User Guide work in progress Ready for larger collaboration

10 2 x Intel Xeon CPU E5-2620 v3 @ 2.40GHz + NVIDIA Tesla K40c Data: 1024^3 (floats)

11 2 x Intel Xeon CPU E5-2620 v3 @ 2.40GHz + NVIDIA Tesla K40c Data: 1024^3 (floats)

12 struct Sine: public vtkm::worklet::WorkletMapField { typedef void ControlSignature(FieldIn<>, FieldOut<>); typedef _2 ExecutionSignature(_1); template VTKM_EXEC_EXPORT T operator()(T x) const { return vtkm::math::Sin(x); } };

13 struct Sine: public vtkm::worklet::WorkletMapField { typedef void ControlSignature(FieldIn<>, FieldOut<>); typedef _2 ExecutionSignature(_1); template VTKM_EXEC_EXPORT T operator()(T x) const { return vtkm::math::Sin(x); } };

14 struct Sine: public vtkm::worklet::WorkletMapField { typedef void ControlSignature(FieldIn<>, FieldOut<>); typedef _2 ExecutionSignature(_1); template VTKM_EXEC_EXPORT T operator()(T x) const { return vtkm::math::Sin(x); } };

15 struct Sine: public vtkm::worklet::WorkletMapField { typedef void ControlSignature(FieldIn<>, FieldOut<>); typedef _2 ExecutionSignature(_1); template VTKM_EXEC_EXPORT T operator()(T x) const { return vtkm::math::Sin(x); } };

16 struct Sine: public vtkm::worklet::WorkletMapField { typedef void ControlSignature(FieldIn<>, FieldOut<>); typedef _2 ExecutionSignature(_1); template VTKM_EXEC_EXPORT T operator()(T x) const { return vtkm::math::Sin(x); } };

17 struct Sine: public vtkm::worklet::WorkletMapField { typedef void ControlSignature(FieldIn<>, FieldOut<>); typedef _2 ExecutionSignature(_1); template VTKM_EXEC_EXPORT T operator()(T x) const { return vtkm::math::Sin(x); } };

18 struct Sine: public vtkm::worklet::WorkletMapField { typedef void ControlSignature(FieldIn<>, FieldOut<>); typedef _2 ExecutionSignature(_1); template VTKM_EXEC_EXPORT T operator()(T x) const { return vtkm::math::Sin(x); } };

19 struct Sine: public vtkm::worklet::WorkletMapField { typedef void ControlSignature(FieldIn<>, FieldOut<>); typedef _2 ExecutionSignature(_1); template VTKM_EXEC_EXPORT T operator()(T x) const { return vtkm::math::Sin(x); } }; Execution Environment Control Environment vtkm::cont::ArrayHandle inputHandle = vtkm::cont::make_ArrayHandle(input); vtkm::cont::ArrayHandle sineResult; vtkm::worklet::DispatcherMapField dispatcher; dispatcher.Invoke(inputHandle, sineResult);

20 struct Sine: public vtkm::worklet::WorkletMapField { typedef void ControlSignature(FieldIn<>, FieldOut<>); typedef _2 ExecutionSignature(_1); template VTKM_EXEC_EXPORT T operator()(T x) const { return vtkm::math::Sin(x); } }; vtkm::cont::ArrayHandle inputHandle = vtkm::cont::make_ArrayHandle(input); vtkm::cont::ArrayHandle sineResult; vtkm::worklet::DispatcherMapField dispatcher; dispatcher.Invoke(inputHandle, sineResult); Execution Environment Control Environment

21 struct Sine: public vtkm::worklet::WorkletMapField { typedef void ControlSignature(FieldIn<>, FieldOut<>); typedef _2 ExecutionSignature(_1); template VTKM_EXEC_EXPORT T operator()(T x) const { return vtkm::math::Sin(x); } }; vtkm::cont::ArrayHandle inputHandle = vtkm::cont::make_ArrayHandle(input); vtkm::cont::ArrayHandle sineResult; vtkm::worklet::DispatcherMapField dispatcher; dispatcher.Invoke(inputHandle, sineResult); Execution Environment Control Environment

22 struct Sine: public vtkm::worklet::WorkletMapField { typedef void ControlSignature(FieldIn<>, FieldOut<>); typedef _2 ExecutionSignature(_1); template VTKM_EXEC_EXPORT T operator()(T x) const { return vtkm::math::Sin(x); } }; vtkm::cont::ArrayHandle inputHandle = vtkm::cont::make_ArrayHandle(input); vtkm::cont::ArrayHandle sineResult; vtkm::worklet::DispatcherMapField dispatcher; dispatcher.Invoke(inputHandle, sineResult); Execution Environment Control Environment

23 struct Sine: public vtkm::worklet::WorkletMapField { typedef void ControlSignature(FieldIn<>, FieldOut<>); typedef _2 ExecutionSignature(_1); template VTKM_EXEC_EXPORT T operator()(T x) const { return vtkm::math::Sin(x); } };

24 Dispatcher Invoke Operations Convert polymorphic types to static types Check types Dispatcher-specific operations –Find domain length –Build index arrays Transport data from control to execution Run worklet invoke kernel Fetch thread-specific data Invoke worklet Push thread-specific data DispatcherMapField dispatcher; dispatcher.Invoke(inputHandle, sineResult);

25 struct ImagToPolar: public vtkm::worklet::WorkletMapField { typedef void ControlSignature( FieldIn, FieldOut, FieldOut ); typedef void ExecutionSignature(_1, _2, _3, _4); template<typename RealType, typename ImaginaryType, typename MagnitudeType, typename PhaseType> VTKM_EXEC_EXPORT void operator()(RealType real, ImaginaryType imag, MagnitudeType &magnitude, PhaseType &phase) const { magnitude = vtkm::math::Sqrt(real*real + imag*imag); phase = vtkm::math::ATan2(imaginary, real); } };

26 Coprocessing/In-situ Use of VTK and VTK-m –Process data in place using VTK-m –Visualize and analyze using VTK Bringing highly parallelized visualization and analytics in science to all Create bridges between VTK and VTK-m 26

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