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On Mali-G76, it will take 2 cycles for 2-D bi-linear filtering per 4 sample quad. Does it mean that read_imagef() and write_imagef() have the same cycles in doing 2-D bi-linear filtering?

xwentian

Hi,

When I read the materials about G76, especially about its texture unit. I encountered a question about its performance in doing 2-D Bi-linear interpolation. It was said that for Mali-G76 the best case performance (bi-linear filtered samples) is 0.5 cycles per sample. Some other related descriptions were given as well, like that this counter increments for every texture filtering issue cycle, that some instructions take more than one cycle due to multi-cycle data access and filtering operations, and that  the costs per 4 sample quad are:(i) 2D bilinear filtering takes two cycles, (ii)2D trilinear filtering takes four cycles; (iii) 3D bilinear filtering takes four cycles, and (iv) 3D trilinear filtering takes eight cycles. So my question is whether the OpenCL API read_imagef() and write_imagef() has the same performance in using texture unit on 2-D bi-linear interpolation.

Thanks.

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  • 0 in reply to Peter Harris

    Hi, Pete

    Thanks for your reply. I parsed the way of using OpenCL to implement the bi-linear interpolation and its maximal performance. As for your suggestion, I think you recommend that the input image should be kept in the texture memory, a read-only on-chip memory space to the GPU threads, rather than the common way of puting the input image data in the local memory. Am I right in thinking your recommendation so?

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  • 0 in reply to Peter Harris

    Hi, Pete

    Thanks for your reply. I parsed the way of using OpenCL to implement the bi-linear interpolation and its maximal performance. As for your suggestion, I think you recommend that the input image should be kept in the texture memory, a read-only on-chip memory space to the GPU threads, rather than the common way of puting the input image data in the local memory. Am I right in thinking your recommendation so?

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