TNL::Algorithms::Segments::EllpackBase< Device, Index, Organization, Alignment > Class Template Reference

EllpackBase serves as a base class for TNL::Algorithms::Segments::Ellpack and TNL::Algorithms::Segments::EllpackView. More...

#include <TNL/Algorithms/Segments/EllpackBase.h>

Inheritance diagram for TNL::Algorithms::Segments::EllpackBase< Device, Index, Organization, Alignment >:

Public Types
using	DeviceType = Device
	The device where the segments are operating.
using	IndexType = std::remove_const_t< Index >
	The type used for indexing of segments elements.
using	SegmentViewType = SegmentView< IndexType, Organization >
	Accessor type for one particular segment.

Public Member Functions
__cuda_callable__	EllpackBase ()=default
	Default constructor with no parameters to create empty segments view.
__cuda_callable__	EllpackBase (const EllpackBase &)=default
	Copy constructor.
__cuda_callable__	EllpackBase (EllpackBase &&) noexcept=default
	Move constructor.
__cuda_callable__	EllpackBase (IndexType segmentsCount, IndexType segmentSize, IndexType alignedSize)
	Constructor that initializes segments based on their sizes.
template<typename Function>
void	forAllElements (Function &&function) const
template<typename Condition, typename Function>
void	forAllElementsIf (Condition condition, Function function) const
template<typename Function>
void	forAllSegments (Function &&function) const
template<typename Array, typename Function>
void	forElements (const Array &segmentIndexes, Function function) const
template<typename Array, typename Function>
void	forElements (const Array &segmentIndexes, Index begin, Index end, Function function) const
template<typename Function>
void	forElements (IndexType begin, IndexType end, Function &&function) const
template<typename Condition, typename Function>
void	forElementsIf (IndexType begin, IndexType end, Condition condition, Function function) const
template<typename Function>
void	forSegments (IndexType begin, IndexType end, Function &&function) const
__cuda_callable__ IndexType	getAlignedSize () const
	Returns the aligned number of segments.
__cuda_callable__ IndexType	getElementCount () const
	Returns the number of elements managed by all segments.
__cuda_callable__ IndexType	getGlobalIndex (Index segmentIdx, Index localIdx) const
	Computes the global index of an element managed by the segments.
__cuda_callable__ IndexType	getSegmentCount () const
	Returns the number of segments.
__cuda_callable__ IndexType	getSegmentsCount () const
	Returns the number of segments. Deprecated, use getSegmentCount().
__cuda_callable__ IndexType	getSegmentSize () const
	Returns the number of elements managed by all segments.
__cuda_callable__ IndexType	getSegmentSize (IndexType segmentIdx) const
	Returns the size of a particular segment denoted by segmentIdx.
__cuda_callable__ SegmentViewType	getSegmentView (IndexType segmentIdx) const
	Returns a segment view (i.e., a segment accessor) for the specified segment index.
__cuda_callable__ IndexType	getSize () const
	Returns the number of elements managed by all segments.
__cuda_callable__ IndexType	getStorageSize () const
	Returns number of elements that needs to be allocated by a container connected to this segments.
EllpackBase &	operator= (const EllpackBase &)=delete
	Copy-assignment operator.
EllpackBase &	operator= (EllpackBase &&)=delete
	Move-assignment operator.

Static Public Member Functions
static constexpr int	getAlignment ()
	Returns the alignment of the number of segments.
static constexpr ElementsOrganization	getOrganization ()
	Returns the data layout.
static std::string	getSegmentsType ()
	Returns string with the segments type.
static std::string	getSerializationType ()
	Returns string with the serialization type.
static constexpr bool	havePadding ()
	This function denotes that the Ellpack format uses padding elements.

Protected Member Functions
__cuda_callable__ void	bind (IndexType segmentsCount, IndexType segmentSize, IndexType alignedSize)
	Re-initializes the internal attributes of the base class.

Protected Attributes
IndexType	alignedSize = 0
IndexType	segmentsCount = 0
IndexType	segmentSize = 0

Detailed Description

template<typename Device, typename Index, ElementsOrganization Organization, int Alignment>
class TNL::Algorithms::Segments::EllpackBase< Device, Index, Organization, Alignment >

EllpackBase serves as a base class for TNL::Algorithms::Segments::Ellpack and TNL::Algorithms::Segments::EllpackView.

Template Parameters

Device	is type of device where the segments will be operating.
Index	is type for indexing of the elements managed by the segments.
Organization	is the organization of the elements in the segments—either row-major or column-major order.
Alignment	is the alignment of the number of segments (to optimize data alignment, particularly on GPUs).

Member Function Documentation

bind()

template<typename Device, typename Index, ElementsOrganization Organization, int Alignment>

__cuda_callable__ void TNL::Algorithms::Segments::EllpackBase< Device, Index, Organization, Alignment >::bind ( IndexType segmentsCount, IndexType segmentSize, IndexType alignedSize )

protected

Re-initializes the internal attributes of the base class.

Note that this function is protected to ensure that the user cannot modify the base class of segments. For the same reason, in future code development we also need to make sure that all non-const functions in the base class return by value and not by reference.

getGlobalIndex()

template<typename Device, typename Index, ElementsOrganization Organization, int Alignment>

__cuda_callable__ IndexType TNL::Algorithms::Segments::EllpackBase< Device, Index, Organization, Alignment >::getGlobalIndex ( Index segmentIdx, Index localIdx ) const

nodiscard

Computes the global index of an element managed by the segments.

The global index serves as a reference to the element within its container.

Parameters

segmentIdx	The index of the segment containing the element.
localIdx	The local index of the element within the segment.

Returns

The global index of the element.

getSegmentsType()

template<typename Device, typename Index, ElementsOrganization Organization, int Alignment>

std::string TNL::Algorithms::Segments::EllpackBase< Device, Index, Organization, Alignment >::getSegmentsType ( )

staticnodiscard

Returns string with the segments type.

Example

#include <iostream>
#include <functional>
#include <TNL/Algorithms/Segments/CSR.h>
#include <TNL/Algorithms/Segments/Ellpack.h>
#include <TNL/Devices/Host.h>
#include <TNL/Devices/Cuda.h>
 
template< typename Segments >
void
SegmentsExample()
{
   /***
    * Create segments and print the segments type.
    */
   Segments segments;
   std::cout << "The segments type is: " << segments.getSegmentsType() << '\n';
}
 
int
main( int argc, char* argv[] )
{
   std::cout << "Example of CSR segments on host:\n";
   SegmentsExample< TNL::Algorithms::Segments::CSR< TNL::Devices::Host, int > >();
 
   std::cout << "Example of Ellpack segments on host:\n";
   SegmentsExample< TNL::Algorithms::Segments::Ellpack< TNL::Devices::Host, int > >();
 
#ifdef __CUDACC__
   std::cout << "Example of CSR segments on CUDA GPU:\n";
   SegmentsExample< TNL::Algorithms::Segments::CSR< TNL::Devices::Cuda, int > >();
 
   std::cout << "Example of Ellpack segments on CUDA GPU:\n";
   SegmentsExample< TNL::Algorithms::Segments::Ellpack< TNL::Devices::Cuda, int > >();
#endif
   return EXIT_SUCCESS;
}

Output

Example of CSR segments on host:
The segments type is: CSR
Example of Ellpack segments on host:
The segments type is: Ellpack
Example of CSR segments on CUDA GPU:
The segments type is: CSR
Example of Ellpack segments on CUDA GPU:
The segments type is: Ellpack

getSegmentView()

template<typename Device, typename Index, ElementsOrganization Organization, int Alignment>

__cuda_callable__ SegmentViewType TNL::Algorithms::Segments::EllpackBase< Device, Index, Organization, Alignment >::getSegmentView ( IndexType segmentIdx ) const

nodiscard

Returns a segment view (i.e., a segment accessor) for the specified segment index.

Parameters

segmentIdx

The index of the requested segment.

Returns

The segment view of the specified segment.

Example

#include <iostream>
#include <TNL/Containers/Vector.h>
#include <TNL/Algorithms/Segments/CSR.h>
#include <TNL/Algorithms/Segments/Ellpack.h>
#include <TNL/Algorithms/SequentialFor.h>
#include <TNL/Devices/Host.h>
#include <TNL/Devices/Cuda.h>
 
template< typename Segments >
void
SegmentsExample()
{
   using Device = typename Segments::DeviceType;
 
   /***
    * Create segments with given segments sizes.
    */
   const int size( 5 );
   Segments segments{ 1, 2, 3, 4, 5 };
   auto view = segments.getView();
 
   /***
    * Print the elements mapping using segment view.
    */
   std::cout << "Mapping of local indexes to global indexes:\n";
 
   auto f = [ = ] __cuda_callable__( int segmentIdx )
   {
      printf( "Segment idx. %d: ", segmentIdx );  // printf works even in GPU kernels
      auto segment = view.getSegmentView( segmentIdx );
      for( auto element : segment )
         printf( "%d -> %d \t", element.localIndex(), element.globalIndex() );
      printf( "\n" );
   };
   TNL::Algorithms::SequentialFor< Device >::exec( 0, size, f );
}
 
int
main( int argc, char* argv[] )
{
   std::cout << "Example of CSR segments on host:\n";
   SegmentsExample< TNL::Algorithms::Segments::CSR< TNL::Devices::Host, int > >();
 
   std::cout << "Example of Ellpack segments on host:\n";
   SegmentsExample< TNL::Algorithms::Segments::Ellpack< TNL::Devices::Host, int > >();
 
#ifdef __CUDACC__
   std::cout << "Example of CSR segments on CUDA GPU:\n";
   SegmentsExample< TNL::Algorithms::Segments::CSR< TNL::Devices::Cuda, int > >();
 
   std::cout << "Example of Ellpack segments on CUDA GPU:\n";
   SegmentsExample< TNL::Algorithms::Segments::Ellpack< TNL::Devices::Cuda, int > >();
#endif
   return EXIT_SUCCESS;
}

Output

Example of CSR segments on host:
Mapping of local indexes to global indexes:
Segment idx. 0: 0 -> 0  
Segment idx. 1: 0 -> 1  1 -> 2  
Segment idx. 2: 0 -> 3  1 -> 4  2 -> 5  
Segment idx. 3: 0 -> 6  1 -> 7  2 -> 8  3 -> 9  
Segment idx. 4: 0 -> 10     1 -> 11     2 -> 12     3 -> 13     4 -> 14     
Example of Ellpack segments on host:
Mapping of local indexes to global indexes:
Segment idx. 0: 0 -> 0  1 -> 1  2 -> 2  3 -> 3  4 -> 4  
Segment idx. 1: 0 -> 5  1 -> 6  2 -> 7  3 -> 8  4 -> 9  
Segment idx. 2: 0 -> 10     1 -> 11     2 -> 12     3 -> 13     4 -> 14     
Segment idx. 3: 0 -> 15     1 -> 16     2 -> 17     3 -> 18     4 -> 19     
Segment idx. 4: 0 -> 20     1 -> 21     2 -> 22     3 -> 23     4 -> 24     
Example of CSR segments on CUDA GPU:
Mapping of local indexes to global indexes:
Segment idx. 0: 0 -> 0  
Segment idx. 1: 0 -> 1  1 -> 2  
Segment idx. 2: 0 -> 3  1 -> 4  2 -> 5  
Segment idx. 3: 0 -> 6  1 -> 7  2 -> 8  3 -> 9  
Segment idx. 4: 0 -> 10     1 -> 11     2 -> 12     3 -> 13     4 -> 14     
Example of Ellpack segments on CUDA GPU:
Mapping of local indexes to global indexes:
Segment idx. 0: 0 -> 0  1 -> 32     2 -> 64     3 -> 96     4 -> 128    
Segment idx. 1: 0 -> 1  1 -> 33     2 -> 65     3 -> 97     4 -> 129    
Segment idx. 2: 0 -> 2  1 -> 34     2 -> 66     3 -> 98     4 -> 130    
Segment idx. 3: 0 -> 3  1 -> 35     2 -> 67     3 -> 99     4 -> 131    
Segment idx. 4: 0 -> 4  1 -> 36     2 -> 68     3 -> 100    4 -> 132    

getSerializationType()

template<typename Device, typename Index, ElementsOrganization Organization, int Alignment>

std::string TNL::Algorithms::Segments::EllpackBase< Device, Index, Organization, Alignment >::getSerializationType ( )

staticnodiscard

Returns string with the serialization type.

Example

#include <iostream>
#include <functional>
#include <TNL/Algorithms/Segments/CSR.h>
#include <TNL/Algorithms/Segments/Ellpack.h>
#include <TNL/Devices/Host.h>
#include <TNL/Devices/Cuda.h>
 
template< typename Segments >
void
SegmentsExample()
{
   /***
    * Create segments and print the serialization type.
    */
   Segments segments;
   std::cout << "The serialization type is: " << segments.getSerializationType() << '\n';
}
 
int
main( int argc, char* argv[] )
{
   std::cout << "Example of CSR segments on host:\n";
   SegmentsExample< TNL::Algorithms::Segments::CSR< TNL::Devices::Host, int > >();
 
   std::cout << "Example of Ellpack segments on host:\n";
   SegmentsExample< TNL::Algorithms::Segments::Ellpack< TNL::Devices::Host, int > >();
 
#ifdef __CUDACC__
   std::cout << "Example of CSR segments on CUDA GPU:\n";
   SegmentsExample< TNL::Algorithms::Segments::CSR< TNL::Devices::Cuda, int > >();
 
   std::cout << "Example of Ellpack segments on CUDA GPU:\n";
   SegmentsExample< TNL::Algorithms::Segments::Ellpack< TNL::Devices::Cuda, int > >();
#endif
   return EXIT_SUCCESS;
}

Output

Example of CSR segments on host:
The serialization type is: CSR< int >
Example of Ellpack segments on host:
The serialization type is: Ellpack< int, RowMajorOrder, 32 >
Example of CSR segments on CUDA GPU:
The serialization type is: CSR< int >
Example of Ellpack segments on CUDA GPU:
The serialization type is: Ellpack< int, ColumnMajorOrder, 32 >

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The documentation for this class was generated from the following file:

• src/TNL/Algorithms/Segments/EllpackBase.h