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<div class="title">custom-kernels.cpp</div> </div>
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<div class="contents">
<p>This tutorial explains how users can inject their own OpenCL compute kernels for use with ViennaCL objects</p>
<p>We start with including the necessary headers: </p>
<div class="fragment"><div class="line"><span class="comment">// System headers</span></div>
<div class="line"><span class="preprocessor">#include <iostream></span></div>
<div class="line"><span class="preprocessor">#include <string></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#ifndef VIENNACL_WITH_OPENCL</span></div>
<div class="line"><span class="preprocessor"> #define VIENNACL_WITH_OPENCL</span></div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// ViennaCL headers</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="backend_8hpp.html">viennacl/ocl/backend.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="vector_8hpp.html">viennacl/vector.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="norm__2_8hpp.html">viennacl/linalg/norm_2.hpp</a>"</span></div>
</div><!-- fragment --><p> The next step is to define the custom compute kernels in a string. It is assumed that you are familiar with writing basic OpenCL kernels. If this is not the case, please have a look at one of the many OpenCL tutorials in the web.</p>
<p>We define two custom compute kernels which compute an elementwise product and the element-wise division of two vectors. <br/>
Input: v1 ... vector <br/>
v2 ... vector <br/>
Output: result ... vector <br/>
</p>
<p>Algorithm: set result[i] <- v1[i] * v2[i] <br/>
or result[i] <- v1[i] / v2[i] <br/>
(in MATLAB notation this is 'result = v1 .* v2' and 'result = v1 ./ v2'); </p>
<div class="fragment"><div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> * my_compute_program =</div>
<div class="line"><span class="stringliteral">"__kernel void elementwise_prod(\n"</span></div>
<div class="line"><span class="stringliteral">" __global const float * vec1,\n"</span></div>
<div class="line"><span class="stringliteral">" __global const float * vec2, \n"</span></div>
<div class="line"><span class="stringliteral">" __global float * result,\n"</span></div>
<div class="line"><span class="stringliteral">" unsigned int size) \n"</span></div>
<div class="line"><span class="stringliteral">"{ \n"</span></div>
<div class="line"><span class="stringliteral">" for (unsigned int i = get_global_id(0); i < size; i += get_global_size(0))\n"</span></div>
<div class="line"><span class="stringliteral">" result[i] = vec1[i] * vec2[i];\n"</span></div>
<div class="line"><span class="stringliteral">"};\n\n"</span></div>
<div class="line"><span class="stringliteral">"__kernel void elementwise_div(\n"</span></div>
<div class="line"><span class="stringliteral">" __global const float * vec1,\n"</span></div>
<div class="line"><span class="stringliteral">" __global const float * vec2, \n"</span></div>
<div class="line"><span class="stringliteral">" __global float * result,\n"</span></div>
<div class="line"><span class="stringliteral">" unsigned int size) \n"</span></div>
<div class="line"><span class="stringliteral">"{ \n"</span></div>
<div class="line"><span class="stringliteral">" for (unsigned int i = get_global_id(0); i < size; i += get_global_size(0))\n"</span></div>
<div class="line"><span class="stringliteral">" result[i] = vec1[i] / vec2[i];\n"</span></div>
<div class="line"><span class="stringliteral">"};\n"</span>;</div>
</div><!-- fragment --><p> Since no auxiliary routines are needed, we can directly start with <a class="el" href="tests_2src_2bisect_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main()</a>. </p>
<div class="fragment"><div class="line"><span class="keywordtype">int</span> <a name="a0"></a><a class="code" href="tests_2src_2bisect_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>()</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">typedef</span> <span class="keywordtype">float</span> <a name="a1"></a><a class="code" href="fft__1d_8cpp.html#ad5c19ca4f47d3f8ec21232a5af2624e5">ScalarType</a>;</div>
</div><!-- fragment --><p> Initialize OpenCL vectors: </p>
<div class="fragment"><div class="line"><span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> vector_size = 10;</div>
<div class="line"><a name="_a2"></a><a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> vec1(vector_size);</div>
<div class="line"><a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> vec2(vector_size);</div>
<div class="line"><a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> result_mul(vector_size);</div>
<div class="line"><a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> result_div(vector_size);</div>
</div><!-- fragment --><p> Fill the operands vec1 and vec2 with some numbers. </p>
<div class="fragment"><div class="line"><span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<vector_size; ++i)</div>
<div class="line">{</div>
<div class="line"> vec1[i] = <span class="keyword">static_cast<</span>ScalarType<span class="keyword">></span>(i);</div>
<div class="line"> vec2[i] = <span class="keyword">static_cast<</span>ScalarType<span class="keyword">></span>(vector_size-i);</div>
<div class="line">}</div>
</div><!-- fragment --><p> Set up the OpenCL program given in my_compute_kernel: A program is one compilation unit and can hold many different compute kernels. </p>
<div class="fragment"><div class="line"><a name="_a3"></a><a class="code" href="classviennacl_1_1ocl_1_1program.html">viennacl::ocl::program</a> & my_prog = <a name="a4"></a><a class="code" href="namespaceviennacl_1_1ocl.html#a16fc917445ce2010e7b16fbc968771b7">viennacl::ocl::current_context</a>().<a name="a5"></a><a class="code" href="classviennacl_1_1ocl_1_1context.html#a9094ac71f0cdf80df698c0c84ebb483d">add_program</a>(my_compute_program, <span class="stringliteral">"my_compute_program"</span>);</div>
<div class="line"><span class="comment">// Note: Releases older than ViennaCL 1.5.0 required calls to add_kernel(). This is no longer needed, the respective interface has been removed.</span></div>
</div><!-- fragment --><p> Now we can get the kernels from the program 'my_program'. (Note that first all kernels need to be registered via add_kernel() before <a class="el" href="namespaceviennacl_1_1ocl.html#a61a73653d92f1eb2ef9c649ec253e29f" title="Convenience function for getting the kernel for a particular program from the current active context...">get_kernel()</a> can be called, otherwise existing references might be invalidated) </p>
<div class="fragment"><div class="line"><a name="_a6"></a><a class="code" href="classviennacl_1_1ocl_1_1kernel.html">viennacl::ocl::kernel</a> & my_kernel_mul = my_prog.<a name="a7"></a><a class="code" href="classviennacl_1_1ocl_1_1program.html#a117eef2c7894ab1d794bc115d2a23f4a">get_kernel</a>(<span class="stringliteral">"elementwise_prod"</span>);</div>
<div class="line"><a class="code" href="classviennacl_1_1ocl_1_1kernel.html">viennacl::ocl::kernel</a> & my_kernel_div = my_prog.<a class="code" href="classviennacl_1_1ocl_1_1program.html#a117eef2c7894ab1d794bc115d2a23f4a">get_kernel</a>(<span class="stringliteral">"elementwise_div"</span>);</div>
</div><!-- fragment --><p> Launch the kernel with 'vector_size' threads in one work group Note that std::size_t might differ between host and device. Thus, a cast to cl_uint is necessary for the forth argument. </p>
<div class="fragment"><div class="line"><a name="a8"></a><a class="code" href="namespaceviennacl_1_1ocl.html#a5f2022f653ea1cf364d20e3ff84dcada">viennacl::ocl::enqueue</a>(my_kernel_mul(vec1, vec2, result_mul, static_cast<cl_uint>(vec1.size())));</div>
<div class="line"><a class="code" href="namespaceviennacl_1_1ocl.html#a5f2022f653ea1cf364d20e3ff84dcada">viennacl::ocl::enqueue</a>(my_kernel_div(vec1, vec2, result_div, static_cast<cl_uint>(vec1.size())));</div>
</div><!-- fragment --><p> Print the result: </p>
<div class="fragment"><div class="line">std::cout << <span class="stringliteral">" vec1: "</span> << vec1 << std::endl;</div>
<div class="line">std::cout << <span class="stringliteral">" vec2: "</span> << vec2 << std::endl;</div>
<div class="line">std::cout << <span class="stringliteral">"vec1 .* vec2: "</span> << result_mul << std::endl;</div>
<div class="line">std::cout << <span class="stringliteral">"vec1 /* vec2: "</span> << result_div << std::endl;</div>
<div class="line">std::cout << <span class="stringliteral">"norm_2(vec1 .* vec2): "</span> << <a name="a9"></a><a class="code" href="namespaceviennacl_1_1linalg.html#ae46f15d01c01f92a153b3f555a15096b">viennacl::linalg::norm_2</a>(result_mul) << std::endl;</div>
<div class="line">std::cout << <span class="stringliteral">"norm_2(vec1 /* vec2): "</span> << <a class="code" href="namespaceviennacl_1_1linalg.html#ae46f15d01c01f92a153b3f555a15096b">viennacl::linalg::norm_2</a>(result_div) << std::endl;</div>
</div><!-- fragment --><p> We are already done. We only needed a few lines of code by letting ViennaCL deal with the details :-) </p>
<div class="fragment"><div class="line"> std::cout << <span class="stringliteral">"!!!! TUTORIAL COMPLETED SUCCESSFULLY !!!!"</span> << std::endl;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> EXIT_SUCCESS;</div>
<div class="line">}</div>
</div><!-- fragment --> <h2>Full Example Code</h2>
<div class="fragment"><div class="line"><span class="comment">/* =========================================================================</span></div>
<div class="line"><span class="comment"> Copyright (c) 2010-2016, Institute for Microelectronics,</span></div>
<div class="line"><span class="comment"> Institute for Analysis and Scientific Computing,</span></div>
<div class="line"><span class="comment"> TU Wien.</span></div>
<div class="line"><span class="comment"> Portions of this software are copyright by UChicago Argonne, LLC.</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> -----------------</span></div>
<div class="line"><span class="comment"> ViennaCL - The Vienna Computing Library</span></div>
<div class="line"><span class="comment"> -----------------</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> Project Head: Karl Rupp rupp@iue.tuwien.ac.at</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> (A list of authors and contributors can be found in the PDF manual)</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> License: MIT (X11), see file LICENSE in the base directory</span></div>
<div class="line"><span class="comment">============================================================================= */</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// System headers</span></div>
<div class="line"><span class="preprocessor">#include <iostream></span></div>
<div class="line"><span class="preprocessor">#include <string></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#ifndef VIENNACL_WITH_OPENCL</span></div>
<div class="line"><span class="preprocessor"> #define VIENNACL_WITH_OPENCL</span></div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// ViennaCL headers</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="backend_8hpp.html">viennacl/ocl/backend.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="vector_8hpp.html">viennacl/vector.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="norm__2_8hpp.html">viennacl/linalg/norm_2.hpp</a>"</span></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> * my_compute_program =</div>
<div class="line"><span class="stringliteral">"__kernel void elementwise_prod(\n"</span></div>
<div class="line"><span class="stringliteral">" __global const float * vec1,\n"</span></div>
<div class="line"><span class="stringliteral">" __global const float * vec2, \n"</span></div>
<div class="line"><span class="stringliteral">" __global float * result,\n"</span></div>
<div class="line"><span class="stringliteral">" unsigned int size) \n"</span></div>
<div class="line"><span class="stringliteral">"{ \n"</span></div>
<div class="line"><span class="stringliteral">" for (unsigned int i = get_global_id(0); i < size; i += get_global_size(0))\n"</span></div>
<div class="line"><span class="stringliteral">" result[i] = vec1[i] * vec2[i];\n"</span></div>
<div class="line"><span class="stringliteral">"};\n\n"</span></div>
<div class="line"><span class="stringliteral">"__kernel void elementwise_div(\n"</span></div>
<div class="line"><span class="stringliteral">" __global const float * vec1,\n"</span></div>
<div class="line"><span class="stringliteral">" __global const float * vec2, \n"</span></div>
<div class="line"><span class="stringliteral">" __global float * result,\n"</span></div>
<div class="line"><span class="stringliteral">" unsigned int size) \n"</span></div>
<div class="line"><span class="stringliteral">"{ \n"</span></div>
<div class="line"><span class="stringliteral">" for (unsigned int i = get_global_id(0); i < size; i += get_global_size(0))\n"</span></div>
<div class="line"><span class="stringliteral">" result[i] = vec1[i] / vec2[i];\n"</span></div>
<div class="line"><span class="stringliteral">"};\n"</span>;</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span> <a class="code" href="tests_2src_2bisect_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>()</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">typedef</span> <span class="keywordtype">float</span> <a class="code" href="fft__1d_8cpp.html#ad5c19ca4f47d3f8ec21232a5af2624e5">ScalarType</a>;</div>
<div class="line"></div>
<div class="line"> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> vector_size = 10;</div>
<div class="line"> <a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> vec1(vector_size);</div>
<div class="line"> <a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> vec2(vector_size);</div>
<div class="line"> <a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> result_mul(vector_size);</div>
<div class="line"> <a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> result_div(vector_size);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<vector_size; ++i)</div>
<div class="line"> {</div>
<div class="line"> vec1[i] = <span class="keyword">static_cast<</span>ScalarType<span class="keyword">></span>(i);</div>
<div class="line"> vec2[i] = <span class="keyword">static_cast<</span>ScalarType<span class="keyword">></span>(vector_size-i);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <a class="code" href="classviennacl_1_1ocl_1_1program.html">viennacl::ocl::program</a> & my_prog = <a class="code" href="namespaceviennacl_1_1ocl.html#a16fc917445ce2010e7b16fbc968771b7">viennacl::ocl::current_context</a>().<a class="code" href="classviennacl_1_1ocl_1_1context.html#a9094ac71f0cdf80df698c0c84ebb483d">add_program</a>(my_compute_program, <span class="stringliteral">"my_compute_program"</span>);</div>
<div class="line"> <span class="comment">// Note: Releases older than ViennaCL 1.5.0 required calls to add_kernel(). This is no longer needed, the respective interface has been removed.</span></div>
<div class="line"></div>
<div class="line"> <a class="code" href="classviennacl_1_1ocl_1_1kernel.html">viennacl::ocl::kernel</a> & my_kernel_mul = my_prog.<a class="code" href="classviennacl_1_1ocl_1_1program.html#a117eef2c7894ab1d794bc115d2a23f4a">get_kernel</a>(<span class="stringliteral">"elementwise_prod"</span>);</div>
<div class="line"> <a class="code" href="classviennacl_1_1ocl_1_1kernel.html">viennacl::ocl::kernel</a> & my_kernel_div = my_prog.<a class="code" href="classviennacl_1_1ocl_1_1program.html#a117eef2c7894ab1d794bc115d2a23f4a">get_kernel</a>(<span class="stringliteral">"elementwise_div"</span>);</div>
<div class="line"></div>
<div class="line"> <a class="code" href="namespaceviennacl_1_1ocl.html#a5f2022f653ea1cf364d20e3ff84dcada">viennacl::ocl::enqueue</a>(my_kernel_mul(vec1, vec2, result_mul, static_cast<cl_uint>(vec1.<a name="a10"></a><a class="code" href="classviennacl_1_1vector__base.html#a15c47ae4326098aeaa4ed6b91fc6df9b">size</a>())));</div>
<div class="line"> <a class="code" href="namespaceviennacl_1_1ocl.html#a5f2022f653ea1cf364d20e3ff84dcada">viennacl::ocl::enqueue</a>(my_kernel_div(vec1, vec2, result_div, static_cast<cl_uint>(vec1.<a class="code" href="classviennacl_1_1vector__base.html#a15c47ae4326098aeaa4ed6b91fc6df9b">size</a>())));</div>
<div class="line"></div>
<div class="line"> std::cout << <span class="stringliteral">" vec1: "</span> << vec1 << std::endl;</div>
<div class="line"> std::cout << <span class="stringliteral">" vec2: "</span> << vec2 << std::endl;</div>
<div class="line"> std::cout << <span class="stringliteral">"vec1 .* vec2: "</span> << result_mul << std::endl;</div>
<div class="line"> std::cout << <span class="stringliteral">"vec1 /* vec2: "</span> << result_div << std::endl;</div>
<div class="line"> std::cout << <span class="stringliteral">"norm_2(vec1 .* vec2): "</span> << <a class="code" href="namespaceviennacl_1_1linalg.html#ae46f15d01c01f92a153b3f555a15096b">viennacl::linalg::norm_2</a>(result_mul) << std::endl;</div>
<div class="line"> std::cout << <span class="stringliteral">"norm_2(vec1 /* vec2): "</span> << <a class="code" href="namespaceviennacl_1_1linalg.html#ae46f15d01c01f92a153b3f555a15096b">viennacl::linalg::norm_2</a>(result_div) << std::endl;</div>
<div class="line"></div>
<div class="line"> std::cout << <span class="stringliteral">"!!!! TUTORIAL COMPLETED SUCCESSFULLY !!!!"</span> << std::endl;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> EXIT_SUCCESS;</div>
<div class="line">}</div>
<div class="line"></div>
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