How to check if burst transfers are used in OpenCL code ?

[xil_tour]

Hi,

I would like to check if a certain code uses burst transfers (Xilinx edge detection example, for instance).

It's easy to see that in C/C++ code because of the pragmas, however I can't see that clearly in OpenCL code.

Could it be :

__attribute__((xcl_pipeline_loop(1)))

or

__attribute__((xcl_loop_tripcount(c_size*c_size, c_size*c_size)))

or some combination ?

[bchebrol · Accepted solution]

Hi @xil_tour ,

If you are using OpenCL kernel, then you need to add "param:compiler.interfaceWrBurstLen" and "param:compiler.interfaceRdBurstLen" to CLFLAGS.

please check below example for reference:

https://github.com/Xilinx/SDAccel_Examples/tree/master/getting_started/kernel_to_gmem/burst_rw_ocl

If C kernel is used, then "max_read_burst_length" ,"max_write_burst_length" should be added to m_axi interface in the kernel.

please check below C kernel example:

https://github.com/Xilinx/SDAccel_Examples/tree/master/getting_started/kernel_to_gmem/burst_rw_c

Regards,
Vishnu
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[xil_tour]

Ok, thanks for your time.