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  1. 1. flags for memory creation

How to create memory on OpenCL device

flags for memory creation

  • CL_MEM_USE_HOST_PTR

    • Use host memory directly, which could be accessed by device directly.
    • Host and device could access the memory directly, without cl mapping, clEnqueueMapBuffer()
    • Both host and device use the unique host memory.

  • CL_MEM_ALLOC_HOST_PTR

    • Allocate memory on device side, like vram
    • Host could access the memory by clEnqueueMapBuffer()
    • If set it only, host_ptr must be NULL.
    • If set it with CL_MEM_COPY_HOST_PTR, host_ptr must be non-NULL.
    • Invalid to use CL_MEM_USE_HOST_PTR and CL_MEM_ALLOC_HOST_PTR.

  • CL_MEM_COPY_HOST_PTR

    • Copy memory from host to device, host_ptr must be non-NULL.
    • The host_ptr is different from copied memory on device

  • reference

Contents
  1. 1. flags for memory creation