Acts::Cuda::Details Namespace Reference

Classes
struct	SpacePoint
	Helper struct describing a spacepoint on the device. More...
struct	DubletCounts
	Helper struct summarising the results of the dublet search. More...
struct	LinCircle
	Helper struct holding the linearly transformed coordinates of spacepoints. More...
struct	Triplet
	Structure used in the CUDA-based triplet finding. More...
class	DeviceArrayDeleter
	Class performing the deletion of a CUDA device memory array. More...
class	HostArrayDeleter
	Class performing the deletion of pinned host memory. More...

Functions
DubletCounts	countDublets (std::size_t maxBlockSize, std::size_t nMiddleSP, const device_array< unsigned int > &middleBottomCounts, const device_array< unsigned int > &middleTopCounts)
void	findDublets (std::size_t maxBlockSize, std::size_t nBottomSPs, const device_array< SpacePoint > &bottomSPs, std::size_t nMiddleSPs, const device_array< SpacePoint > &middleSPs, std::size_t nTopSPs, const device_array< SpacePoint > &topSPs, float deltaRMin, float deltaRMax, float cotThetaMax, float collisionRegionMin, float collisionRegionMax, device_array< unsigned int > &middleBottomCounts, device_array< std::size_t > &middleBottomDublets, device_array< unsigned int > &middleTopCounts, device_array< std::size_t > &middleTopDublets)
std::vector< std::vector < Triplet > >	findTriplets (const Info::Device &device, std::size_t maxBlockSize, const DubletCounts &dubletCounts, const SeedFilterConfig &seedConfig, const TripletFilterConfig &filterConfig, std::size_t nBottomSPs, const device_array< SpacePoint > &bottomSPs, std::size_t nMiddleSPs, const device_array< SpacePoint > &middleSPs, std::size_t nTopSPs, const device_array< SpacePoint > &topSPs, const device_array< unsigned int > &middleBottomCounts, const device_array< std::size_t > &middleBottomDublets, const device_array< unsigned int > &middleTopCounts, const device_array< std::size_t > &middleTopDublets, float maxScatteringAngle2, float sigmaScattering, float minHelixDiameter2, float pT2perRadius, float impactMax)

Detailed Description

Namespace holding some implementation detail types that should not be used directly in client code.

Function Documentation

DubletCounts Acts::Cuda::Details::countDublets	(	std::size_t	maxBlockSize,
		std::size_t	nMiddleSP,
		const device_array< unsigned int > &	middleBottomCounts,
		const device_array< unsigned int > &	middleTopCounts
	)

Calculate summary values for the dublet search

After the dublet search is done, we need to know some information about how many duplets were found exactly. As this information is necessary for the scheduing of the subsequent steps of the execution on the GPU. This function is used to collect this information

Parameters

maxBlockSize	The maximum block size to use on the GPU
nMiddleSP	The number of middle spacepoints for which the dublet reconstruction was run
middleBottomCounts	The output from the Acts::Cuda::Details::findDublets(...) function with the same name
middleTopCounts	The output from the Acts::Cuda::Details::findDublets(...) function with the same name

Returns

An object holding all the summary statistics necessary for the subsequent steps of GPU execution

Referenced by Acts::Cuda::SeedFinder< external_spacepoint_t >::createSeedsForGroup().

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void Acts::Cuda::Details::findDublets	(	std::size_t	maxBlockSize,
		std::size_t	nBottomSPs,
		const device_array< SpacePoint > &	bottomSPs,
		std::size_t	nMiddleSPs,
		const device_array< SpacePoint > &	middleSPs,
		std::size_t	nTopSPs,
		const device_array< SpacePoint > &	topSPs,
		float	deltaRMin,
		float	deltaRMax,
		float	cotThetaMax,
		float	collisionRegionMin,
		float	collisionRegionMax,
		device_array< unsigned int > &	middleBottomCounts,
		device_array< std::size_t > &	middleBottomDublets,
		device_array< unsigned int > &	middleTopCounts,
		device_array< std::size_t > &	middleTopDublets
	)

Find all viable middle-bottom and middle-top dublets

This function is run as the first step in the seed finding, looking for viable middle-bottom and middle-top spacepoint pairs for the subsequent steps of the code.

Note that middleBottomCounts and middleTopCounts have type "unsigned int" instead of "std::size_t", because the GPU code needs to execute atomic operations on these arrays. And CUDA does not define such operations on std::size_t (i.e. unsigned long).

Parameters

[in]	maxBlockSize	The maximum block size to use on the GPU
[in]	nBottomSPs	The number of bottom spacepoints in bottomSPs
[in]	bottomSPs	Properties of all of the bottom spacepoints
[in]	nMiddleSPs	The number of middle spacepoints in middleSPs
[in]	middleSPs	Properties of all of the middle spacepoints
[in]	nTopSPs	The number of top spacepoints in topSPs
[in]	topSPs	Properties of all of the top spacepoints
[in]	deltaRMin	Configuration parameter from Acts::SeedFinderConfig
[in]	deltaRMax	Configuration parameter from Acts::SeedFinderConfig
[in]	cotThetaMax	Configuration parameter from Acts::SeedFinderConfig
[in]	collisionRegionMin	Configuration parameter from Acts::SeedFinderConfig
[in]	collisionRegionMax	Configuration parameter from Acts::SeedFinderConfig
[out]	middleBottomCounts	1-D array of the number of middle-bottom dublets found for each middle spacepoint
[out]	middleBottomDublets	2-D matrix of size nMiddleSPs x nBottomSPs, holding the bottom spacepoint indices for the identified middle-bottom dublets
[out]	middleTopCounts	1-D array of the number of middle-top dublets found for each middle spacepoint
[out]	middleTopDublets	2-D matrix of size nMiddleSPs x nTopSPs, holding the top spacepoint indices for the identified middle-top dublets

Referenced by Acts::Cuda::SeedFinder< external_spacepoint_t >::createSeedsForGroup().

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std::vector<std::vector<Triplet> > Acts::Cuda::Details::findTriplets	(	const Info::Device &	device,
		std::size_t	maxBlockSize,
		const DubletCounts &	dubletCounts,
		const SeedFilterConfig &	seedConfig,
		const TripletFilterConfig &	filterConfig,
		std::size_t	nBottomSPs,
		const device_array< SpacePoint > &	bottomSPs,
		std::size_t	nMiddleSPs,
		const device_array< SpacePoint > &	middleSPs,
		std::size_t	nTopSPs,
		const device_array< SpacePoint > &	topSPs,
		const device_array< unsigned int > &	middleBottomCounts,
		const device_array< std::size_t > &	middleBottomDublets,
		const device_array< unsigned int > &	middleTopCounts,
		const device_array< std::size_t > &	middleTopDublets,
		float	maxScatteringAngle2,
		float	sigmaScattering,
		float	minHelixDiameter2,
		float	pT2perRadius,
		float	impactMax
	)

Find all viable triplets from the provided spacepoint dublets

This function is used to find a "loosely selected" set of seed candidates that still need to be filtered through Acts::SeedFilter::filterSeeds_1SpFixed before returning it to the user.

Parameters

[in]	device	Properties of the device that the code will be running on
[in]	maxBlockSize	The maximum block size to use on the GPU
[in]	dubletCounts	The output object from Acts::Cuda::Details::countDublets
[in]	seedConfig	Configuration parameters for the triplet finding/filtering
[in]	filterConfig	User provided settings (code...) for the triplet filtering
[in]	nBottomSPs	The number of bottom spacepoints in bottomSPs
[in]	bottomSPs	Properties of all of the bottom spacepoints
[in]	nMiddleSPs	The number of middle spacepoints in middleSPs
[in]	middleSPs	Properties of all of the middle spacepoints
[in]	nTopSPs	The number of top spacepoints in topSPs
[in]	topSPs	Properties of all of the top spacepoints
[in]	middleBottomCounts	1-D array of the number of middle-bottom dublets found for each middle spacepoint
[in]	middleBottomDublets	2-D matrix of size nMiddleSPs x nBottomSPs, holding the bottom spacepoint indices for the identified middle-bottom dublets
[in]	middleTopCounts	1-D array of the number of middle-top dublets found for each middle spacepoint
[in]	middleTopDublets	2-D matrix of size nMiddleSPs x nTopSPs, holding the top spacepoint indices for the identified middle-top dublets
[in]	maxScatteringAngle2	Configuration parameter from Acts::SeedFinderConfig
[in]	sigmaScattering	Configuration parameter from Acts::SeedFinderConfig
[in]	minHelixDiameter2	Configuration parameter from Acts::SeedFinderConfig
[in]	pT2perRadius	Configuration parameter from Acts::SeedFinderConfig
[in]	impactMax	Configuration parameter from Acts::SeedFinderConfig

Returns

A 2-D structure holding the parameters of the identified triplets for each middle spacepoint

Referenced by Acts::Cuda::SeedFinder< external_spacepoint_t >::createSeedsForGroup(), and Acts::SingleSeedVertexFinder< spacepoint_t >::findVertex().

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