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 <span id="projectnumber">1.7.1</span>
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<div class="title">blas3.cpp</div> </div>
</div><!--header-->
<div class="contents">
<p>In this tutorial it is shown how BLAS level 3 functionality in ViennaCL can be used.</p>
<p>We begin with defining preprocessor constants and including the necessary headers. </p>
<div class="fragment"><div class="line"><span class="comment">//disable debug mechanisms to have a fair comparison with ublas:</span></div>
<div class="line"><span class="preprocessor">#ifndef NDEBUG</span></div>
<div class="line"><span class="preprocessor"> #define NDEBUG</span></div>
<div class="line"><span class="preprocessor">#endif</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"></div>
<div class="line"></div>
<div class="line"><span class="comment">// ublas headers</span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/io.hpp></span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/triangular.hpp></span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/matrix_sparse.hpp></span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/matrix.hpp></span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/matrix_proxy.hpp></span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/lu.hpp></span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/io.hpp></span></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">// Must be set if you want to use ViennaCL algorithms on ublas objects</span></div>
<div class="line"><span class="preprocessor">#define VIENNACL_WITH_UBLAS 1</span></div>
<div class="line"></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="scalar_8hpp.html">viennacl/scalar.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="matrix_8hpp.html">viennacl/matrix.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="prod_8hpp.html">viennacl/linalg/prod.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="random_8hpp.html">viennacl/tools/random.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="timer_8hpp.html">viennacl/tools/timer.hpp</a>"</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#define BLAS3_MATRIX_SIZE 400</span></div>
<div class="line"></div>
<div class="line"><span class="keyword">using namespace </span>boost::numeric;</div>
</div><!-- fragment --><p> Later in this tutorial we will iterate over all available OpenCL devices. To ensure that this tutorial also works if no OpenCL backend is activated, we need this dummy-struct. </p>
<div class="fragment"><div class="line"><span class="preprocessor">#ifndef VIENNACL_WITH_OPENCL</span></div>
<div class="line"> <span class="keyword">struct </span>dummy</div>
<div class="line"> {</div>
<div class="line"> std::size_t <a name="a0"></a><a class="code" href="namespaceviennacl_1_1traits.html#aa2344ea20469f55fbc15a8e9526494d0">size</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> 1; }</div>
<div class="line"> };</div>
<div class="line"><span class="preprocessor">#endif</span></div>
</div><!-- fragment --><p> We don't need additional auxiliary routines, so let us start straight away with <a class="el" href="examples_2tutorial_2blas3_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main()</a>:</p>
<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">//disable debug mechanisms to have a fair comparison with ublas:</span></div>
<div class="line"><span class="preprocessor">#ifndef NDEBUG</span></div>
<div class="line"><span class="preprocessor"> #define NDEBUG</span></div>
<div class="line"><span class="preprocessor">#endif</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"></div>
<div class="line"></div>
<div class="line"><span class="comment">// ublas headers</span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/io.hpp></span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/triangular.hpp></span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/matrix_sparse.hpp></span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/matrix.hpp></span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/matrix_proxy.hpp></span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/lu.hpp></span></div>
<div class="line"><span class="preprocessor">#include <boost/numeric/ublas/io.hpp></span></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">// Must be set if you want to use ViennaCL algorithms on ublas objects</span></div>
<div class="line"><span class="preprocessor">#define VIENNACL_WITH_UBLAS 1</span></div>
<div class="line"></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="scalar_8hpp.html">viennacl/scalar.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="matrix_8hpp.html">viennacl/matrix.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="prod_8hpp.html">viennacl/linalg/prod.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="random_8hpp.html">viennacl/tools/random.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="timer_8hpp.html">viennacl/tools/timer.hpp</a>"</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#define BLAS3_MATRIX_SIZE 400</span></div>
<div class="line"></div>
<div class="line"><span class="keyword">using namespace </span>boost::numeric;</div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#ifndef VIENNACL_WITH_OPENCL</span></div>
<div class="line"> <span class="keyword">struct </span>dummy</div>
<div class="line"> {</div>
<div class="line"> std::size_t <a class="code" href="namespaceviennacl_1_1traits.html#aa2344ea20469f55fbc15a8e9526494d0">size</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> 1; }</div>
<div class="line"> };</div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span> <a name="a1"></a><a class="code" href="examples_2tutorial_2blas3_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="a2"></a><a class="code" href="fft__1d_8cpp.html#ad5c19ca4f47d3f8ec21232a5af2624e5">ScalarType</a>;</div>
<div class="line"></div>
<div class="line"> <a name="_a3"></a><a class="code" href="classviennacl_1_1tools_1_1timer.html">viennacl::tools::timer</a> timer;</div>
<div class="line"> <span class="keywordtype">double</span> exec_time;</div>
<div class="line"></div>
<div class="line"> <a name="_a4"></a><a class="code" href="classviennacl_1_1tools_1_1uniform__random__numbers.html">viennacl::tools::uniform_random_numbers<ScalarType></a> randomNumber;</div>
<div class="line"></div>
<div class="line"> ublas::matrix<ScalarType> ublas_A(<a name="a5"></a><a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>, <a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>);</div>
<div class="line"> ublas::matrix<ScalarType, ublas::column_major> ublas_B(<a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>, <a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>);</div>
<div class="line"> ublas::matrix<ScalarType> ublas_C(<a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>, <a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>);</div>
<div class="line"> ublas::matrix<ScalarType> ublas_C1(<a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>, <a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>);</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 < ublas_A.size1(); ++i)</div>
<div class="line"> <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> j = 0; j < ublas_A.size2(); ++j)</div>
<div class="line"> ublas_A(i,j) = randomNumber();</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 < ublas_B.size1(); ++i)</div>
<div class="line"> <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> j = 0; j < ublas_B.size2(); ++j)</div>
<div class="line"> ublas_B(i,j) = randomNumber();</div>
<div class="line"></div>
<div class="line"> <span class="comment">//viennacl::ocl::set_context_device_type(0, viennacl::ocl::gpu_tag()); //uncomment this is you wish to use GPUs only</span></div>
<div class="line"> <a name="_a6"></a><a class="code" href="classviennacl_1_1matrix.html">viennacl::matrix<ScalarType></a> vcl_A(<a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>, <a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>);</div>
<div class="line"> <a class="code" href="classviennacl_1_1matrix.html">viennacl::matrix<ScalarType, viennacl::column_major></a> vcl_B(<a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>, <a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>);</div>
<div class="line"> <a class="code" href="classviennacl_1_1matrix.html">viennacl::matrix<ScalarType></a> vcl_C(<a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>, <a class="code" href="blas3range_8cpp.html#a182e37b13d9e73b3fa8226df1fce81cd">BLAS3_MATRIX_SIZE</a>);</div>
<div class="line"></div>
<div class="line"> std::cout << <span class="stringliteral">"--- Computing matrix-matrix product using ublas ---"</span> << std::endl;</div>
<div class="line"> timer.<a name="a7"></a><a class="code" href="classviennacl_1_1tools_1_1timer.html#ac3e360cdcecfb05861baa2800e4f2888">start</a>();</div>
<div class="line"> ublas_C = <a name="a8"></a><a class="code" href="sparse__prod_8cpp.html#a2c8637b3d6a972d1d8fd85fb3089c6da">ublas::prod</a>(ublas_A, ublas_B);</div>
<div class="line"> exec_time = timer.<a name="a9"></a><a class="code" href="classviennacl_1_1tools_1_1timer.html#af44313f16c89e97704c90b1ebcc17bca">get</a>();</div>
<div class="line"> std::cout << <span class="stringliteral">" - Execution time: "</span> << exec_time << std::endl;</div>
<div class="line"></div>
<div class="line"> std::cout << std::endl << <span class="stringliteral">"--- Computing matrix-matrix product on each available compute device using ViennaCL ---"</span> << std::endl;</div>
<div class="line"><span class="preprocessor">#ifdef VIENNACL_WITH_OPENCL</span></div>
<div class="line"> std::vector<viennacl::ocl::device> devices = <a name="a10"></a><a class="code" href="namespaceviennacl_1_1ocl.html#a16fc917445ce2010e7b16fbc968771b7">viennacl::ocl::current_context</a>().<a name="a11"></a><a class="code" href="classviennacl_1_1ocl_1_1context.html#a122abd131e682733ff44bdf480365ba2">devices</a>();</div>
<div class="line"><span class="preprocessor">#else</span></div>
<div class="line"> dummy devices;</div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span> (std::size_t device_id=0; device_id<devices.size(); ++device_id)</div>
<div class="line"> {</div>
<div class="line"><span class="preprocessor">#ifdef VIENNACL_WITH_OPENCL</span></div>
<div class="line"> <a class="code" href="namespaceviennacl_1_1ocl.html#a16fc917445ce2010e7b16fbc968771b7">viennacl::ocl::current_context</a>().<a name="a12"></a><a class="code" href="classviennacl_1_1ocl_1_1context.html#a85373fa81be824eef324579bf429d201">switch_device</a>(devices[device_id]);</div>
<div class="line"> std::cout << <span class="stringliteral">" - Device Name: "</span> << <a name="a13"></a><a class="code" href="namespaceviennacl_1_1ocl.html#ac54d59a74deaccec81f64e738b856348">viennacl::ocl::current_device</a>().<a name="a14"></a><a class="code" href="classviennacl_1_1ocl_1_1device.html#a204d0038c694efb1b006bd768008da8f">name</a>() << std::endl;</div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"></div>
<div class="line"> <a name="a15"></a><a class="code" href="namespaceviennacl.html#a10b7f8cf6b8864a7aa196d670481a453">viennacl::copy</a>(ublas_A, vcl_A);</div>
<div class="line"> <a class="code" href="namespaceviennacl.html#a10b7f8cf6b8864a7aa196d670481a453">viennacl::copy</a>(ublas_B, vcl_B);</div>
<div class="line"> vcl_C = <a name="a16"></a><a class="code" href="namespaceviennacl_1_1linalg.html#aa18d10f8a90e38bd9ff43c650fc670ef">viennacl::linalg::prod</a>(vcl_A, vcl_B);</div>
<div class="line"> <a name="a17"></a><a class="code" href="namespaceviennacl_1_1backend.html#a3707340b27c535438e213e3879b0f0a4">viennacl::backend::finish</a>();</div>
<div class="line"> timer.<a class="code" href="classviennacl_1_1tools_1_1timer.html#ac3e360cdcecfb05861baa2800e4f2888">start</a>();</div>
<div class="line"> vcl_C = <a class="code" href="namespaceviennacl_1_1linalg.html#aa18d10f8a90e38bd9ff43c650fc670ef">viennacl::linalg::prod</a>(vcl_A, vcl_B);</div>
<div class="line"> <a class="code" href="namespaceviennacl_1_1backend.html#a3707340b27c535438e213e3879b0f0a4">viennacl::backend::finish</a>();</div>
<div class="line"> exec_time = timer.<a class="code" href="classviennacl_1_1tools_1_1timer.html#af44313f16c89e97704c90b1ebcc17bca">get</a>();</div>
<div class="line"> std::cout << <span class="stringliteral">" - Execution time on device (no setup time included): "</span> << exec_time << std::endl;</div>
<div class="line"></div>
<div class="line"> <a class="code" href="namespaceviennacl.html#a10b7f8cf6b8864a7aa196d670481a453">viennacl::copy</a>(vcl_C, ublas_C1);</div>
<div class="line"></div>
<div class="line"> std::cout << <span class="stringliteral">" - Checking result... "</span>;</div>
<div class="line"> <span class="keywordtype">bool</span> check_ok = <span class="keyword">true</span>;</div>
<div class="line"> <span class="keywordflow">for</span> (std::size_t i = 0; i < ublas_A.size1(); ++i)</div>
<div class="line"> {</div>
<div class="line"> <span class="keywordflow">for</span> (std::size_t j = 0; j < ublas_A.size2(); ++j)</div>
<div class="line"> {</div>
<div class="line"> <span class="keywordflow">if</span> ( std::fabs(ublas_C1(i,j) - ublas_C(i,j)) / ublas_C(i,j) > 1e-4 )</div>
<div class="line"> {</div>
<div class="line"> check_ok = <span class="keyword">false</span>;</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> (!check_ok)</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> (check_ok)</div>
<div class="line"> std::cout << <span class="stringliteral">"[OK]"</span> << std::endl << std::endl;</div>
<div class="line"> <span class="keywordflow">else</span></div>
<div class="line"> std::cout << <span class="stringliteral">"[FAILED]"</span> << std::endl << std::endl;</div>
<div class="line"></div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> std::cout << <span class="stringliteral">"!!!! TUTORIAL COMPLETED SUCCESSFULLY !!!!"</span> << std::endl;</div>
<div class="line"> <span class="keywordflow">return</span> EXIT_SUCCESS;</div>
<div class="line">}</div>
<div class="line"></div>
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