dim3 ? What is the data type 'dim3' ?

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi,

This is regarding the SDK code for matrix multiplication…

In the host multiplication function, the block and grid dimensions are declared using the following code:

dim3 dimBlock(BLOCK_SIZE,BLOCK_SIZE);

dim3 dimGrid(wB/dimBlock.x, hA/dimBlock.y);

Muld<<<dimGrid,dimBlock>>> (Ad,Bd,wA,wB,Cd);

What is the data type dim3 and also, what do the functions dimBlock() and dimGrid() do?

Are these functions part of the library and where are these declared?

Thanks…

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dim3 is just a structure designed for storing block and grid dimensions. dimBlock() and dimGrid() are setting the initial values using constructors.

See the programming guide, section 4.3.1.2

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