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OpenCL applications

OpenCL applications consist of two parts: application or host-side code, and OpenCL kernels.

Application, or host-side code:
  • Calls the OpenCL APIs.
  • Compiles the OpenCL kernels.
  • Allocates memory buffers to pass data into and out of the OpenCL kernels.
  • Sets up command queues.
  • Sets up dependencies between the tasks.
  • Sets up the N-Dimensional Range (NDRanges) that the kernels execute over.
OpenCL kernels
  • Written in OpenCL C language.
  • Perform the parallel processing.
  • Run on compute devices such as application processors or GPU shader cores.

You must write both of these parts correctly to get the best performance.