As one would expect, I solved the problem just after asking for help. I
still had an obsolete OpenCL header file that I was using previously that
was somehow conflicting with ViennaCL. After removing said header file (so
there was not other OpenCL headers beyond ViennaCL) the count worked
correctly again.
Apologies for the extra message on the board.
Regards,
Charles
On Mon, Feb 1, 2016 at 2:55 PM, Charles Determan <cdeterma...@gmail.com>
wrote:
> I am trying to convert some more of my raw OpenCL code over to use
> ViennaCL in my gpuR package (https://github.com/cdeterman/gpuR).
> However, I have run in to a very strange result that I can't seem to
> understand. I simply want to count the number of devices for a given
> platform.
>
> I can do this within a C++ file with the following excerpt which results
> with the correct answer of '1' device.
>
> typedef std::vector< viennacl::ocl::platform > platforms_type;
> platforms_type platforms = viennacl::ocl::get_platforms();
> int num_gpus = platforms[0].devices().size();
> std::cout << num_gpus << std::endl;
>
> However, when I place the EXACT same code in my R package (which links
> against the exact same ViennaCL headers in the RViennaCL package) I get the
> following output (with VIENNACL_DEBUG_ALL defined):
>
> ViennaCL: Getting platform...
> ViennaCL: Querying devices available at current platform.
> ViennaCL: Found 1 devices.
> ViennaCL: Creating device object (CTOR with cl_device_id)
> ViennaCL: Creating device object (Copy CTOR)
> [1] 1365402079
>
> Clearly I don't have millions of devices. I do see that it is finding the
> '1' device successfully but the size of 'devices' seems to be behaving
> strangely for me. Do you have any idea why this could be happening?
>
> Regards,
> Charles
>
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