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Altera_Forum
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10 years ago

constant memory usage

Hi , __void kernel A(global int * restrict inputA) ; __void kernel B(constant int * restrict inputB) ; There are two kernels (A and B) . Why kernel B 's RAM / LE / FF / util is small...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

No. Again, utilization kernel utilization only reports the utilization of that specific kernel. What will probably be reflected in the utilization report is the LSU that is needed in order to access global memory in each kernel. So one thing is if you have

__kernel k1(__global int* A) and __kernel k1_noarg()

Utilization reports will show k1 having more resources due to the additional resources needed to access global memory. Global memory is typically DDR and so is off chip and the FPGA does not utilize or have any control over global memory other than have hardware to access it.