GetSumMaxMinTmpSize

Function Usage

To perform Sum computation in the kernel, you need to reserve or allocate the temporary space. This API is used to obtain the maximum and minimum sizes of the temporary space to be reserved or allocated on the host. You can select a proper size within this range as the tiling parameter and pass it to the kernel.

To ensure correct functions, the temporary space to be reserved or allocated cannot be less than the minimum temporary space.
Within the range between the minimum and maximum, as the temporary space increases, the API computing performance on the kernel can be optimized to some extent. For better performance, reserve or allocate the temporary space based on the actual memory usage. The maximum temporary space of this API is currently equal to the minimum temporary space.

Prototype

inline void GetSumMaxMinTmpSize(const uint32_t n, const uint32_t typeSize, const bool isReuseSource, uint32_t& maxSize, uint32_t& minSize)

Parameters

**Table 1** API parameters
Parameter	Input/Output	Function
n	Input	Number of actually computed elements in each row of input data.
typeSize	Input	Size of the input data type, in bytes. For example, if the input data type is half, set this parameter to 2.
isReuseSource	Input	Whether to reuse the space of the source operand input, which must be the same as that of the Sum API. This parameter is reserved.
maxValue	Output	Maximum size of the temporary space required by Sum computation. Any space exceeding this value will not be utilized by the API. NOTE: maxValue is for reference only and may be larger than the available space of the Unified Buffer. In this case, select a proper temporary space size based on the available space of the Unified Buffer.
minValue	Output	Minimum size of the temporary space required by Sum computation. To ensure correct functions, the size of the temporary space to be reserved or allocated during API computation cannot be smaller than the value of this parameter.

Returns

None

Restrictions

None

Example

// If the input shape is a 2 × 3 matrix, n is 3. The data type of the operator input is half. Pass the default value false for isReuseSource.
uint32_t n = 3;
uint32_t maxValue = 0;
uint32_t minValue = 0;
AscendC::GetSumMaxMinTmpSize(n, 2, false, maxValue, minValue);

Parent topic: Sum Interface