Hey KarlI have a question here:a.) Suppose I have three raw buffers (let us
assume float); I would like to do something like this:v = (I- a) / (W-a+EPS),
where I, W and a are the three buffers and EPS is a scalar to prevent a
division by 0 operation.
b.) I know I can wrap these buffers to Eigen matrices and then copy them to VCL
using the API's. However, is there a way to do this step in a 1 shot operation
without acutally wrapping them to Eigen? Essentially, this is an element-wise
subtraction and a division happening simultaneously, and both are
embarrassingly parallel operations.
The second question I have is w.r.t OpenCL SDK selection:a.) Let us assume I
have an Intel CPU with an AMD GPU. VCL supports OpenCL backends for both CPU
and GPU and I have the liberty to choose any device and any backend.b.) If I
were to have this combination, how would I go about building the code? Do I
need to download SDK's for both combinations (so that I can distribute both
binaries?). I had posed this question on the OpenCL users group in LinkedIn but
got no response so thought of asking you instead. Thanks and Regards Sumit
From: Karl Rupp <r...@iue.tuwien.ac.at>
To: Charles Determan <cdeterma...@gmail.com>; viennacl-devel
<viennacl-devel@lists.sourceforge.net>
Sent: Saturday, January 30, 2016 1:34 AM
Subject: Re: [ViennaCL-devel] Current context index?
Hi Charles,
sorry for the late response. Currently there is no way of getting the
internal index. You can, however, edit viennacl/ocl/backend.hpp and add
a public member function in viennacl::ocl::backend returning the index.
Best regards,
Karli
On 01/29/2016 04:00 PM, Charles Determan wrote:
> While trying to figure out the device index I thought the following
> would work:
>
> viennacl::ocl::current_context().current_device_id_
>
> but apparently the `current_device_id_` is private (which didn't appear
> to be the case in the context.hpp file). Perhaps a simple method for
> its' accession? If this functionality doesn't exist I can likely write
> this.
>
> I still have made no headway on the context index.
>
> Regards,
> Charles
>
> On Thu, Jan 28, 2016 at 1:30 PM, Charles Determan <cdeterma...@gmail.com
> <mailto:cdeterma...@gmail.com>> wrote:
>
> A user can switch contexts easily with
>
> long id = 1;
> viennacl::ocl::switch_context(id);
>
> Is there a way to determine the current context index? In this case
> it would return 1?
>
> The corollary for platform is:
>
> viennacl::ocl::current_context().platform_index()
>
>
> I also don't see a method for device_index() either. But it is
> possible I am simply overlooking this somewhere in the documentation.
>
> Regards,
> Charles
>
>
>
>
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