Hi all, I have programmed a function to be executed at GPU using arrayfun call. I need to debug it but when I set breakpoints the program does not stop!!. How can I execute it step by step on GPU?.
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The body of anarrayfun call is run on the GPU using a translation of the MATLAB code to a native form for the GPU. This gives much better performance, but does not allow debugging. Depending on your function, you might simply be able to call the function directly withgpuArray arguments, and debug that way. I.e. replace
out = arrayfun(@myFcn, in)
with
out = myFcn(in)
Obviously, this depends on whether your function can be run in vectorised form as well as element-wise form.
Running MATLAB under a CUDA debugger is possible, but rather difficult. You first need to ensure you can use the debugger on a standalone CUDA program. It is almost certainly going to be much simpler to write a simple standalone CUDA program and use the debugger on that.
One other approach is to "debug" by modifying your kernel. Start with the simplest part, ensure that works correctly (probably by having your kernel return early), and then incrementally include more and more of your kernel.
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