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<div class="title">custom-context.cpp</div> </div>
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<a href="custom-context_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/* =========================================================================</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> Copyright (c) 2010-2016, Institute for Microelectronics,</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> Institute for Analysis and Scientific Computing,</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> TU Wien.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> Portions of this software are copyright by UChicago Argonne, LLC.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"></span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> -----------------</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> ViennaCL - The Vienna Computing Library</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> -----------------</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"></span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> Project Head: Karl Rupp rupp@iue.tuwien.ac.at</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"></span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> (A list of authors and contributors can be found in the PDF manual)</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"></span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> License: MIT (X11), see file LICENSE in the base directory</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">============================================================================= */</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// System headers</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <iostream></span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include <string></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#ifndef VIENNACL_WITH_OPENCL</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor"> #define VIENNACL_WITH_OPENCL</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// ViennaCL headers</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#include "<a class="code" href="backend_8hpp.html">viennacl/ocl/backend.hpp</a>"</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#include "<a class="code" href="vector_8hpp.html">viennacl/vector.hpp</a>"</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#include "<a class="code" href="matrix_8hpp.html">viennacl/matrix.hpp</a>"</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#include "<a class="code" href="matrix__operations_8hpp.html">viennacl/linalg/matrix_operations.hpp</a>"</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#include "<a class="code" href="norm__2_8hpp.html">viennacl/linalg/norm_2.hpp</a>"</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#include "<a class="code" href="prod_8hpp.html">viennacl/linalg/prod.hpp</a>"</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> * my_compute_program =</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="stringliteral">"__kernel void elementwise_prod(\n"</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="stringliteral">" __global const float * vec1,\n"</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="stringliteral">" __global const float * vec2, \n"</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="stringliteral">" __global float * result,\n"</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="stringliteral">" unsigned int size) \n"</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="stringliteral">"{ \n"</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="stringliteral">" for (unsigned int i = get_global_id(0); i < size; i += get_global_size(0))\n"</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="stringliteral">" result[i] = vec1[i] * vec2[i];\n"</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="stringliteral">"};\n"</span>;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="keywordtype">int</span> <a class="code" href="tests_2src_2bisect_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>()</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> {</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <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"><a name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">//manually set up a custom OpenCL context:</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  std::vector<cl_device_id> device_id_array;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="comment">//get all available devices</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <a class="code" href="classviennacl_1_1ocl_1_1platform.html">viennacl::ocl::platform</a> pf;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  std::cout << <span class="stringliteral">"Platform info: "</span> << pf.<a class="code" href="classviennacl_1_1ocl_1_1platform.html#ac570aa63d292d47da2258136bef5f6e9">info</a>() << std::endl;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  std::vector<viennacl::ocl::device> devices = pf.<a class="code" href="classviennacl_1_1ocl_1_1platform.html#afaa563522ebe9ce7b80ef02c40e7fe31">devices</a>(CL_DEVICE_TYPE_DEFAULT);</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  std::cout << devices[0].name() << std::endl;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  std::cout << <span class="stringliteral">"Number of devices for custom context: "</span> << devices.size() << std::endl;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">//set up context using all found devices:</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">for</span> (std::size_t i=0; i<devices.size(); ++i)</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  {</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  device_id_array.push_back(devices[i].<span class="keywordtype">id</span>());</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  }</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  std::cout << <span class="stringliteral">"Creating context..."</span> << std::endl;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  cl_int err;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  cl_context my_context = clCreateContext(0, cl_uint(device_id_array.size()), &(device_id_array[0]), NULL, NULL, &err);</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">//create two Vectors:</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> vector_size = 10;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  std::vector<ScalarType> vec1(vector_size);</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  std::vector<ScalarType> vec2(vector_size);</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  std::vector<ScalarType> result(vector_size);</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// fill the operands vec1 and vec2:</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <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"><a name="l00114"></a><span class="lineno"> 114</span>  {</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  vec1[i] = <span class="keyword">static_cast<</span>ScalarType<span class="keyword">></span>(i);</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  vec2[i] = <span class="keyword">static_cast<</span>ScalarType<span class="keyword">></span>(vector_size-i);</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  }</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="comment">// create memory in OpenCL context:</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  cl_mem mem_vec1 = clCreateBuffer(my_context, CL_MEM_READ_WRITE | CL_MEM_COPY_HOST_PTR, vector_size * <span class="keyword">sizeof</span>(ScalarType), &(vec1[0]), &err);</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  cl_mem mem_vec2 = clCreateBuffer(my_context, CL_MEM_READ_WRITE | CL_MEM_COPY_HOST_PTR, vector_size * <span class="keyword">sizeof</span>(ScalarType), &(vec2[0]), &err);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  cl_mem mem_result = clCreateBuffer(my_context, CL_MEM_READ_WRITE | CL_MEM_COPY_HOST_PTR, vector_size * <span class="keyword">sizeof</span>(ScalarType), &(result[0]), &err);</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> </div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="comment">// create a command queue for each device:</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  std::vector<cl_command_queue> queues(devices.size());</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">for</span> (std::size_t i=0; i<devices.size(); ++i)</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  {</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  queues[i] = clCreateCommandQueue(my_context, devices[i].<span class="keywordtype">id</span>(), 0, &err);</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  }</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="comment">// create and build a program in the context:</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  std::size_t source_len = std::string(my_compute_program).length();</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  cl_program my_prog = clCreateProgramWithSource(my_context, 1, &my_compute_program, &source_len, &err);</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  err = clBuildProgram(my_prog, 0, NULL, NULL, NULL, NULL);</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment">/* char buffer[1024];</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"> cl_build_status status;</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="comment"> clGetProgramBuildInfo(my_prog, devices[1].id(), CL_PROGRAM_BUILD_STATUS, sizeof(cl_build_status), &status, NULL);</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment"> clGetProgramBuildInfo(my_prog, devices[1].id(), CL_PROGRAM_BUILD_LOG, sizeof(char)*1024, &buffer, NULL);</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"> std::cout << "Build Scalar: Err = " << err << " Status = " << status << std::endl;</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> std::cout << "Log: " << buffer << std::endl;*/</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> </div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="comment">// create a kernel from the program:</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> * kernel_name = <span class="stringliteral">"elementwise_prod"</span>;</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  cl_kernel my_kernel = clCreateKernel(my_prog, kernel_name, &err);</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> </div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="comment">// Execute elementwise_prod kernel on first queue: result = vec1 .* vec2;</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  err = clSetKernelArg(my_kernel, 0, <span class="keyword">sizeof</span>(cl_mem), (<span class="keywordtype">void</span>*)&mem_vec1);</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  err = clSetKernelArg(my_kernel, 1, <span class="keyword">sizeof</span>(cl_mem), (<span class="keywordtype">void</span>*)&mem_vec2);</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  err = clSetKernelArg(my_kernel, 2, <span class="keyword">sizeof</span>(cl_mem), (<span class="keywordtype">void</span>*)&mem_result);</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  err = clSetKernelArg(my_kernel, 3, <span class="keyword">sizeof</span>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>), (<span class="keywordtype">void</span>*)&vector_size);</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  std::size_t global_size = vector_size;</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  std::size_t local_size = vector_size;</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  err = clEnqueueNDRangeKernel(queues[0], my_kernel, 1, NULL, &global_size, &local_size, 0, NULL, NULL);</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> </div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> </div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="comment">// Read and output result:</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  err = clEnqueueReadBuffer(queues[0], mem_vec1, CL_TRUE, 0, <span class="keyword">sizeof</span>(ScalarType)*vector_size, &(vec1[0]), 0, NULL, NULL);</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  err = clEnqueueReadBuffer(queues[0], mem_result, CL_TRUE, 0, <span class="keyword">sizeof</span>(ScalarType)*vector_size, &(result[0]), 0, NULL, NULL);</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <a class="code" href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a>(err);</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  std::cout << <span class="stringliteral">"vec1 : "</span>;</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keywordflow">for</span> (std::size_t i=0; i<vec1.size(); ++i)</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  std::cout << vec1[i] << <span class="stringliteral">" "</span>;</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  std::cout << std::endl;</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> </div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  std::cout << <span class="stringliteral">"vec2 : "</span>;</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keywordflow">for</span> (std::size_t i=0; i<vec2.size(); ++i)</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  std::cout << vec2[i] << <span class="stringliteral">" "</span>;</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  std::cout << std::endl;</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> </div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  std::cout << <span class="stringliteral">"result: "</span>;</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keywordflow">for</span> (std::size_t i=0; i<result.size(); ++i)</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  std::cout << result[i] << <span class="stringliteral">" "</span>;</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  std::cout << std::endl;</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> </div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <a class="code" href="namespaceviennacl_1_1ocl.html#add1725d48cfd159ce187e287369d1cdb">viennacl::ocl::setup_context</a>(0, my_context, device_id_array, queues);</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <a class="code" href="namespaceviennacl_1_1ocl.html#acc1a7460a9ff237b7c0306c32c3d34c6">viennacl::ocl::switch_context</a>(0); <span class="comment">//activate the new context (only mandatory with context-id not equal to zero)</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  std::cout << <span class="stringliteral">"Existing context: "</span> << my_context << std::endl;</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  std::cout << <span class="stringliteral">"ViennaCL uses context: "</span> << <a class="code" href="namespaceviennacl_1_1ocl.html#a16fc917445ce2010e7b16fbc968771b7">viennacl::ocl::current_context</a>().<a class="code" href="classviennacl_1_1ocl_1_1context.html#a611d95b11db04230f63e37bfeae911db">handle</a>().<a class="code" href="classviennacl_1_1ocl_1_1handle.html#a5074caaee700015fc2d3b03540b01673">get</a>() << std::endl;</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> </div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> vcl_vec1(mem_vec1, vector_size);</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> vcl_vec2(mem_vec2, vector_size);</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> vcl_result(mem_result, vector_size);</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <a class="code" href="classviennacl_1_1scalar.html">viennacl::scalar<ScalarType></a> vcl_s = 2.0;</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> </div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  std::cout << <span class="stringliteral">"Standard vector operations within ViennaCL:"</span> << std::endl;</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  vcl_result = vcl_s * vcl_vec1 + vcl_vec2;</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> </div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  std::cout << <span class="stringliteral">"vec1 : "</span>;</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  std::cout << vcl_vec1 << std::endl;</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> </div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  std::cout << <span class="stringliteral">"vec2 : "</span>;</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  std::cout << vcl_vec2 << std::endl;</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> </div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  std::cout << <span class="stringliteral">"result: "</span>;</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  std::cout << vcl_result << std::endl;</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> </div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  std::cout << <span class="stringliteral">"Using existing kernel within the OpenCL backend of ViennaCL:"</span> << std::endl;</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <a class="code" href="classviennacl_1_1ocl_1_1program.html">viennacl::ocl::program</a> & my_vcl_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_prog, <span class="stringliteral">"my_compute_program"</span>);</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <a class="code" href="classviennacl_1_1ocl_1_1kernel.html">viennacl::ocl::kernel</a> & my_vcl_kernel = my_vcl_prog.<a class="code" href="classviennacl_1_1ocl_1_1program.html#aa4f77fdcd02daa7d71627dc20117ba75">add_kernel</a>(my_kernel, <span class="stringliteral">"elementwise_prod"</span>);</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <a class="code" href="namespaceviennacl_1_1ocl.html#a5f2022f653ea1cf364d20e3ff84dcada">viennacl::ocl::enqueue</a>(my_vcl_kernel(vcl_vec1, vcl_vec2, vcl_result, static_cast<cl_uint>(vcl_vec1.size()))); <span class="comment">//Note that std::size_t might differ between host and device. Thus, a cast to cl_uint is necessary here.</span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> </div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  std::cout << <span class="stringliteral">"vec1 : "</span>;</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  std::cout << vcl_vec1 << std::endl;</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> </div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  std::cout << <span class="stringliteral">"vec2 : "</span>;</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  std::cout << vcl_vec2 << std::endl;</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> </div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  std::cout << <span class="stringliteral">"result: "</span>;</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  std::cout << vcl_result << std::endl;</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> </div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> </div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <a class="code" href="classviennacl_1_1matrix.html">viennacl::matrix<ScalarType></a> vcl_matrix(mem_vec1, 3, 3);</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> </div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  vcl_vec2.resize(3); <span class="comment">//note that the resize operation leads to new memory, thus vcl_vec2 is now at a different memory location (values are copied)</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  vcl_result.resize(3); <span class="comment">//note that the resize operation leads to new memory, thus vcl_vec2 is now at a different memory location (values are copied)</span></div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  vcl_result = <a class="code" href="namespaceviennacl_1_1linalg.html#aa18d10f8a90e38bd9ff43c650fc670ef">viennacl::linalg::prod</a>(vcl_matrix, vcl_vec2);</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span> </div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  std::cout << <span class="stringliteral">"result of matrix-vector product: "</span>;</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  std::cout << vcl_result << std::endl;</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span> </div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  std::cout << <span class="stringliteral">"!!!! TUTORIAL COMPLETED SUCCESSFULLY !!!!"</span> << std::endl;</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span> </div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordflow">return</span> EXIT_SUCCESS;</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span> }</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span> </div>
<div class="ttc" id="classviennacl_1_1ocl_1_1program_html_aa4f77fdcd02daa7d71627dc20117ba75"><div class="ttname"><a href="classviennacl_1_1ocl_1_1program.html#aa4f77fdcd02daa7d71627dc20117ba75">viennacl::ocl::program::add_kernel</a></div><div class="ttdeci">viennacl::ocl::kernel & add_kernel(cl_kernel kernel_handle, std::string const &kernel_name)</div><div class="ttdoc">Adds a kernel to the program. </div><div class="ttdef"><b>Definition:</b> <a href="ocl_2context_8hpp_source.html#l00765">context.hpp:765</a></div></div>
<div class="ttc" id="classviennacl_1_1scalar_html"><div class="ttname"><a href="classviennacl_1_1scalar.html">viennacl::scalar</a></div><div class="ttdoc">This class represents a single scalar value on the GPU and behaves mostly like a built-in scalar type...</div><div class="ttdef"><b>Definition:</b> <a href="forwards_8h_source.html#l00227">forwards.h:227</a></div></div>
<div class="ttc" id="norm__2_8hpp_html"><div class="ttname"><a href="norm__2_8hpp.html">norm_2.hpp</a></div><div class="ttdoc">Generic interface for the l^2-norm. See viennacl/linalg/vector_operations.hpp for implementations...</div></div>
<div class="ttc" id="matrix__operations_8hpp_html"><div class="ttname"><a href="matrix__operations_8hpp.html">matrix_operations.hpp</a></div><div class="ttdoc">Implementations of dense matrix related operations including matrix-vector products. </div></div>
<div class="ttc" id="classviennacl_1_1ocl_1_1platform_html"><div class="ttname"><a href="classviennacl_1_1ocl_1_1platform.html">viennacl::ocl::platform</a></div><div class="ttdoc">Wrapper class for an OpenCL platform. </div><div class="ttdef"><b>Definition:</b> <a href="platform_8hpp_source.html#l00045">platform.hpp:45</a></div></div>
<div class="ttc" id="prod_8hpp_html"><div class="ttname"><a href="prod_8hpp.html">prod.hpp</a></div><div class="ttdoc">Generic interface for matrix-vector and matrix-matrix products. See viennacl/linalg/vector_operations...</div></div>
<div class="ttc" id="classviennacl_1_1ocl_1_1kernel_html"><div class="ttname"><a href="classviennacl_1_1ocl_1_1kernel.html">viennacl::ocl::kernel</a></div><div class="ttdoc">Represents an OpenCL kernel within ViennaCL. </div><div class="ttdef"><b>Definition:</b> <a href="kernel_8hpp_source.html#l00058">kernel.hpp:58</a></div></div>
<div class="ttc" id="matrix_8hpp_html"><div class="ttname"><a href="matrix_8hpp.html">matrix.hpp</a></div><div class="ttdoc">Implementation of the dense matrix class. </div></div>
<div class="ttc" id="tests_2src_2bisect_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="tests_2src_2bisect_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdef"><b>Definition:</b> <a href="tests_2src_2bisect_8cpp_source.html#l00091">bisect.cpp:91</a></div></div>
<div class="ttc" id="classviennacl_1_1ocl_1_1platform_html_afaa563522ebe9ce7b80ef02c40e7fe31"><div class="ttname"><a href="classviennacl_1_1ocl_1_1platform.html#afaa563522ebe9ce7b80ef02c40e7fe31">viennacl::ocl::platform::devices</a></div><div class="ttdeci">std::vector< device > devices(cl_device_type dtype=CL_DEVICE_TYPE_DEFAULT)</div><div class="ttdoc">Returns the available devices of the supplied device type. </div><div class="ttdef"><b>Definition:</b> <a href="platform_8hpp_source.html#l00091">platform.hpp:91</a></div></div>
<div class="ttc" id="namespaceviennacl_1_1ocl_html_a16fc917445ce2010e7b16fbc968771b7"><div class="ttname"><a href="namespaceviennacl_1_1ocl.html#a16fc917445ce2010e7b16fbc968771b7">viennacl::ocl::current_context</a></div><div class="ttdeci">viennacl::ocl::context & current_context()</div><div class="ttdoc">Convenience function for returning the current context. </div><div class="ttdef"><b>Definition:</b> <a href="backend_8hpp_source.html#l00213">backend.hpp:213</a></div></div>
<div class="ttc" id="classviennacl_1_1matrix_html"><div class="ttname"><a href="classviennacl_1_1matrix.html">viennacl::matrix</a></div><div class="ttdoc">A dense matrix class. </div><div class="ttdef"><b>Definition:</b> <a href="forwards_8h_source.html#l00375">forwards.h:375</a></div></div>
<div class="ttc" id="classviennacl_1_1ocl_1_1context_html_a611d95b11db04230f63e37bfeae911db"><div class="ttname"><a href="classviennacl_1_1ocl_1_1context.html#a611d95b11db04230f63e37bfeae911db">viennacl::ocl::context::handle</a></div><div class="ttdeci">const viennacl::ocl::handle< cl_context > & handle() const </div><div class="ttdoc">Returns the context handle. </div><div class="ttdef"><b>Definition:</b> <a href="ocl_2context_8hpp_source.html#l00611">context.hpp:611</a></div></div>
<div class="ttc" id="error_8hpp_html_a44f070f54255e72eb40c75ebd72ea602"><div class="ttname"><a href="error_8hpp.html#a44f070f54255e72eb40c75ebd72ea602">VIENNACL_ERR_CHECK</a></div><div class="ttdeci">#define VIENNACL_ERR_CHECK(err)</div><div class="ttdef"><b>Definition:</b> <a href="error_8hpp_source.html#l00681">error.hpp:681</a></div></div>
<div class="ttc" id="namespaceviennacl_1_1linalg_html_aa18d10f8a90e38bd9ff43c650fc670ef"><div class="ttname"><a href="namespaceviennacl_1_1linalg.html#aa18d10f8a90e38bd9ff43c650fc670ef">viennacl::linalg::prod</a></div><div class="ttdeci">VectorT prod(std::vector< std::vector< T, A1 >, A2 > const &matrix, VectorT const &vector)</div><div class="ttdef"><b>Definition:</b> <a href="prod_8hpp_source.html#l00102">prod.hpp:102</a></div></div>
<div class="ttc" id="classviennacl_1_1ocl_1_1context_html_a9094ac71f0cdf80df698c0c84ebb483d"><div class="ttname"><a href="classviennacl_1_1ocl_1_1context.html#a9094ac71f0cdf80df698c0c84ebb483d">viennacl::ocl::context::add_program</a></div><div class="ttdeci">viennacl::ocl::program & add_program(cl_program p, std::string const &prog_name)</div><div class="ttdoc">Adds a program to the context. </div><div class="ttdef"><b>Definition:</b> <a href="ocl_2context_8hpp_source.html#l00368">context.hpp:368</a></div></div>
<div class="ttc" id="classviennacl_1_1ocl_1_1handle_html_a5074caaee700015fc2d3b03540b01673"><div class="ttname"><a href="classviennacl_1_1ocl_1_1handle.html#a5074caaee700015fc2d3b03540b01673">viennacl::ocl::handle::get</a></div><div class="ttdeci">const OCL_TYPE & get() const </div><div class="ttdef"><b>Definition:</b> <a href="ocl_2handle_8hpp_source.html#l00191">handle.hpp:191</a></div></div>
<div class="ttc" id="classviennacl_1_1vector_html"><div class="ttname"><a href="classviennacl_1_1vector.html">viennacl::vector< ScalarType ></a></div></div>
<div class="ttc" id="classviennacl_1_1ocl_1_1program_html"><div class="ttname"><a href="classviennacl_1_1ocl_1_1program.html">viennacl::ocl::program</a></div><div class="ttdoc">Wrapper class for an OpenCL program. </div><div class="ttdef"><b>Definition:</b> <a href="program_8hpp_source.html#l00042">program.hpp:42</a></div></div>
<div class="ttc" id="backend_8hpp_html"><div class="ttname"><a href="backend_8hpp.html">backend.hpp</a></div><div class="ttdoc">Implementations of the OpenCL backend, where all contexts are stored in. </div></div>
<div class="ttc" id="namespaceviennacl_1_1ocl_html_acc1a7460a9ff237b7c0306c32c3d34c6"><div class="ttname"><a href="namespaceviennacl_1_1ocl.html#acc1a7460a9ff237b7c0306c32c3d34c6">viennacl::ocl::switch_context</a></div><div class="ttdeci">void switch_context(long i)</div><div class="ttdoc">Convenience function for switching the current context. </div><div class="ttdef"><b>Definition:</b> <a href="backend_8hpp_source.html#l00219">backend.hpp:219</a></div></div>
<div class="ttc" id="namespaceviennacl_1_1ocl_html_a5f2022f653ea1cf364d20e3ff84dcada"><div class="ttname"><a href="namespaceviennacl_1_1ocl.html#a5f2022f653ea1cf364d20e3ff84dcada">viennacl::ocl::enqueue</a></div><div class="ttdeci">void enqueue(KernelType &k, viennacl::ocl::command_queue const &queue)</div><div class="ttdoc">Enqueues a kernel in the provided queue. </div><div class="ttdef"><b>Definition:</b> <a href="enqueue_8hpp_source.html#l00050">enqueue.hpp:50</a></div></div>
<div class="ttc" id="vector_8hpp_html"><div class="ttname"><a href="vector_8hpp.html">vector.hpp</a></div><div class="ttdoc">The vector type with operator-overloads and proxy classes is defined here. Linear algebra operations ...</div></div>
<div class="ttc" id="fft__1d_8cpp_html_ad5c19ca4f47d3f8ec21232a5af2624e5"><div class="ttname"><a href="fft__1d_8cpp.html#ad5c19ca4f47d3f8ec21232a5af2624e5">ScalarType</a></div><div class="ttdeci">float ScalarType</div><div class="ttdef"><b>Definition:</b> <a href="fft__1d_8cpp_source.html#l00042">fft_1d.cpp:42</a></div></div>
<div class="ttc" id="classviennacl_1_1ocl_1_1platform_html_ac570aa63d292d47da2258136bef5f6e9"><div class="ttname"><a href="classviennacl_1_1ocl_1_1platform.html#ac570aa63d292d47da2258136bef5f6e9">viennacl::ocl::platform::info</a></div><div class="ttdeci">std::string info() const </div><div class="ttdoc">Returns an information string. </div><div class="ttdef"><b>Definition:</b> <a href="platform_8hpp_source.html#l00071">platform.hpp:71</a></div></div>
<div class="ttc" id="namespaceviennacl_1_1ocl_html_add1725d48cfd159ce187e287369d1cdb"><div class="ttname"><a href="namespaceviennacl_1_1ocl.html#add1725d48cfd159ce187e287369d1cdb">viennacl::ocl::setup_context</a></div><div class="ttdeci">void setup_context(long i, std::vector< cl_device_id > const &devices)</div><div class="ttdoc">Convenience function for setting devices for a context. </div><div class="ttdef"><b>Definition:</b> <a href="backend_8hpp_source.html#l00231">backend.hpp:231</a></div></div>
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