GetSumMaxMinTmpSize

Function Description

To perform Sum computation in the kernel, developers 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. Developers 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 in the kernel can be optimized to some extent. To achieve better performance, reserve or allocate the space based on the actual buffer 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
API	Input/Output	Function
n	Input	Number of actually computed elements in each row of the input.
typeSize	Input	Type size of an operator input. The unit is byte. For example, if the data type of the operator input 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 remaining space of the Unified Buffer. In this case, select a proper temporary space size based on the remaining 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 less than the value of this parameter.

Returns

None

Availability

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