GPU programming with CUDA : Coalescent access vs. non-coalescent Memory Access architecture and execution process

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GPU programming with CUDA : Coalescent access vs. non-coalescent Memory Access architecture and execution process

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Coalescing memory access architecture

coalescing is used to mean making sure that threads run simultaneously, try to access memory that is nearby. This is usually because:

Memory is usually retrieved in large blocks from RAM.
Some processing units will try to predict future memory accesses and cache ahead, while yet processing older parts of memory.
Memory is cached in a hierarchy of successively larger-but-slower caches.

It is even more important with a threaded program so that the memory requests do not jump all over; otherwise, the processing unit will be waiting for memory requests to be fulfilled.

The differences between uncoalesced and coalesced memory accesses are shown in Image

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