cudpp_reduce.h File Reference

Reduce functionality header file - contains CUDPP interface (not public) More...

Functions
void	allocReduceStorage (CUDPPReducePlan *plan)
	Allocate intermediate arrays used by reductions. More...
void	freeReduceStorage (CUDPPReducePlan *plan)
	Deallocate intermediate block sums arrays in a CUDPPReducePlan object. More...
void	cudppReduceDispatch (void *d_out, const void *d_in, size_t numElements, const CUDPPReducePlan *plan)
	Dispatch function to perform a parallel reduction on an array with the specified configuration. More...

Detailed Description

Reduce functionality header file - contains CUDPP interface (not public)

cudpp_reduce.h

Function Documentation

void allocReduceStorage

(

CUDPPReducePlan *

plan

)

Allocate intermediate arrays used by reductions.

Reductions of large arrays must be split into multiple blocks, where each block is reduced by a single CUDA thread block. Each block writes its partial sum to global memory where it is reduced to a single element in a second pass.

Parameters

[in,out]

plan

Pointer to CUDPPReducePlan object containing options and number of elements, which is used to compute storage requirements, and within which intermediate storage is allocated.

Todo:

should this flag an error?

void freeReduceStorage

(

CUDPPReducePlan *

plan

)

Deallocate intermediate block sums arrays in a CUDPPReducePlan object.

These arrays must have been allocated by allocScanStorage(), which is called by the constructor of cudppReducePlan().

Parameters

[in,out]

plan

Pointer to CUDPPReducePlan object initialized by allocScanStorage().

void cudppReduceDispatch	(	void *	d_odata,
		const void *	d_idata,
		size_t	numElements,
		const CUDPPReducePlan *	plan
	)

Dispatch function to perform a parallel reduction on an array with the specified configuration.

This is the dispatch routine which calls reduceArray() with appropriate template parameters and arguments to achieve the scan as specified in plan.

Parameters

[out]	d_odata	The output array of scan results
[in]	d_idata	The input array
[in]	numElements	The number of elements to scan
[in]	plan	Pointer to CUDPPReducePlan object containing reduce options and intermediate storage