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OpenCL data processing

The data processed by OpenCL is in an index space of work-items.

The work-items are organized in an NDRange where:

  • N is the number of dimensions minus one.

  • N can be zero, one, or two.

One kernel instance is executed for each work-item in the index space.

The following figure shows NDRanges with one, two, and three dimensions.

Figure 3-1 NDRanges and work-items


You group work-items into work-groups for processing. The following figure shows a three-dimensional NDRange that is split into 16 work-groups, each with 16 work-items.

Figure 3-2 Work-items and work-groups.


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