6.5.1 About dividing data for OpenCL

Data is divided up so it can be computed in parallel with OpenCL.

The data is divided into three levels of hierarchy:
NDRange
The total number of elements in the NDRange is known as the global work size
Work-groups
The NDRange is divided into work-groups.
Work-items
Each work-group is divided into work-items.
Related reference
Chapter 3 OpenCL Concepts
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