Andreas, thanks for explaining, and sorry for making further demands
on your time with this related question. Is there some way allowing me
to keep my templates as-is (to share code with C++ versions), e.g., my
template cuda_kernel():
template <class T> __global__ void cuda_kernel(T arg1, T arg2) {
...
}
and then have my wrapper be:
extern "C" {
__global__ void external_cuda_kernel(float arg1, float arg2) {
cuda_kernel<float>(arg1, arg2); }
}
This wouldn't work because I can't have a __global__ function invoke
another __global__ function like this on my C2050. I guess I am asking
if your preferred solution for me would let me get away with both (i)
not changing my templates and (ii) not replicating the templated code.
Thanks, let me know if I'm being unclear,
Ahmed
On Tue, Oct 9, 2012 at 1:35 AM, Andreas Kloeckner
<[email protected]> wrote:
> Ahmed Fasih <[email protected]> writes:
>
>> Hi, I am looking at the PyCUDA example for C++ templated kernel calls
>> [1], but I have the __global__ kernel function with a template, i.e.,
>>
>> template <class T> __global__ void cuda_kernel(...)
>>
>> From C++, this is invoked via, e.g.,
>>
>> cuda_kernel<float><<< grid, threads >>>(...)
>>
>> I admit that the theory and PyCUDA practice of name mangling is fuzzy in
>> my head, so you'll forgive me if I am doing something laughable, but I
>> tried, in Python,
>>
>> module = SourceModule(custring, no_extern_c=1)
>> cuda_kernel = module.get_function("cuda_kernel")
>>
>> where "custring" contains the CUDA kernel code, and PyCUDA spits out an
>> error,
>>
>> LogicError: cuModuleGetFunction failed: not found
>>
>> How can I get my host-callable C++-template kernel functions into
>> PyCUDA, aside from the simple-minded workaround of untemplating
>> everything?
>
> Solution I'd prefer: Keep your templates, but make 'extern "C"' wrappers
> with well-defined names for those template kernel that you actually want
> to call.
>
> Otherwise, you'll need one of these:
>
> http://stackoverflow.com/questions/6526500/c-name-mangling-library-for-python
>
> Andreas
--
--
Ahmed Fasih
[email protected]
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614 547 3323 (Google Voice)
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