GetDataBlockSizeInBytes

Product Support

Product	Supported
Atlas A3 training products/Atlas A3 inference products	√
Atlas A2 training products/Atlas A2 inference products	√
Atlas 200I/500 A2 inference products	x
Atlas inference product's AI Core	√
Atlas inference product's Vector Core	x
Atlas training products	√

Function

Obtains the size (in byte) of a data block of the current chip version. You can calculate the values of parameters such as repeatTime, DataBlock Stride, and Repeat stride to be passed in the API command based on the data block size.

Prototype

__aicore__ inline constexpr int16_t GetDataBlockSizeInBytes()

Parameters

None

Returns

Size (in byte) of a data block of the current chip version

Restrictions

None

Example

In the following example, the value of repeatTime is calculated based on the value of data block obtained through GetDataBlockSizeInBytes.

int16_t dataBlockSize = AscendC::GetDataBlockSizeInBytes();
// Each repeat involves eight data blocks. 8 * dataBlockSize/sizeof(half) can be calculated. mask is configured to enable all elements in the iteration to participate in the calculation.
uint64_t mask = 8 * dataBlockSize / sizeof(half);
// Divide a total of 512 elements by the number of elements involved in each repeat to obtain the value of repeatTime.
uint8_t repeatTime = 512 / mask; 
// dstBlkStride, src0BlkStride, src1BlkStride = 1. Data is continuously read and written in a single iteration.
// dstRepStride, src0RepStride, src1RepStride = 8. Data is continuously read and written between adjacent iterations.
AscendC::Add(dstLocal, src0Local, src1Local, mask, repeatTime, { 1, 1, 1, 8, 8, 8 });

Parent topic: System Variable Access