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<div class="headertitle"><div class="title">benchmarks/fft.cpp</div></div>
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<div class="fragment"><div class="line"><span class="comment">/*******************************************************</span></div>
<div class="line"><span class="comment"> * Copyright (c) 2014, ArrayFire</span></div>
<div class="line"><span class="comment"> * All rights reserved.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * This file is distributed under 3-clause BSD license.</span></div>
<div class="line"><span class="comment"> * The complete license agreement can be obtained at:</span></div>
<div class="line"><span class="comment"> * http://arrayfire.com/licenses/BSD-3-Clause</span></div>
<div class="line"><span class="comment"> ********************************************************/</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="arrayfire_8h.htm">arrayfire.h</a>></span></div>
<div class="line"><span class="preprocessor">#include <math.h></span></div>
<div class="line"><span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><span class="preprocessor">#include <cstdlib></span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">using namespace </span><a class="code hl_namespace" href="namespaceaf.htm">af</a>;</div>
<div class="line"> </div>
<div class="line"><span class="comment">// create a small wrapper to benchmark</span></div>
<div class="line"><span class="keyword">static</span> <a id="_a0" name="_a0"></a><a class="code hl_class" href="classaf_1_1array.htm">array</a> A; <span class="comment">// populated before each timing</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> fn() {</div>
<div class="line"> <a class="code hl_class" href="classaf_1_1array.htm">array</a> B = fft2(A); <span class="comment">// 2d fft</span></div>
<div class="line"> B.<a id="a1" name="a1"></a><a class="code hl_function" href="classaf_1_1array.htm#a6a8d7156cd3c66a9ca9f0f2688ee9f72">eval</a>(); <span class="comment">// ensure evaluated</span></div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>** argv) {</div>
<div class="line"> <span class="keywordflow">try</span> {</div>
<div class="line"> <span class="keywordtype">int</span> device = argc > 1 ? atoi(argv[1]) : 0;</div>
<div class="line"> setDevice(device);</div>
<div class="line"> info();</div>
<div class="line"> </div>
<div class="line"> printf(<span class="stringliteral">"Benchmark N-by-N 2D fft\n"</span>);</div>
<div class="line"> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> M = 7; M <= 12; M++) {</div>
<div class="line"> <span class="keywordtype">int</span> N = (1 << M);</div>
<div class="line"> </div>
<div class="line"> printf(<span class="stringliteral">"%4d x %4d: "</span>, N, N);</div>
<div class="line"> A = randu(N, N);</div>
<div class="line"> <span class="keywordtype">double</span> time = timeit(fn); <span class="comment">// time in seconds</span></div>
<div class="line"> <span class="keywordtype">double</span> gflops = 10.0 * N * N * M / (time * 1e9);</div>
<div class="line"> </div>
<div class="line"> printf(<span class="stringliteral">" %4.0f Gflops\n"</span>, gflops);</div>
<div class="line"> fflush(stdout);</div>
<div class="line"> }</div>
<div class="line"> } <span class="keywordflow">catch</span> (<a id="_a2" name="_a2"></a><a class="code hl_class" href="classaf_1_1exception.htm">af::exception</a>& e) { fprintf(stderr, <span class="stringliteral">"%s\n"</span>, e.<a id="a3" name="a3"></a><a class="code hl_function" href="classaf_1_1exception.htm#aa884ff67408851f00e50cf971a4dfd05">what</a>()); }</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="ttc" id="aarrayfire_8h_htm"><div class="ttname"><a href="arrayfire_8h.htm">arrayfire.h</a></div></div>
<div class="ttc" id="aclassaf_1_1array_htm"><div class="ttname"><a href="classaf_1_1array.htm">af::array</a></div><div class="ttdoc">A multi dimensional data container.</div><div class="ttdef"><b>Definition:</b> <a href="array_8h_source.htm#l00037">array.h:37</a></div></div>
<div class="ttc" id="aclassaf_1_1array_htm_a6a8d7156cd3c66a9ca9f0f2688ee9f72"><div class="ttname"><a href="classaf_1_1array.htm#a6a8d7156cd3c66a9ca9f0f2688ee9f72">af::array::eval</a></div><div class="ttdeci">void eval() const</div><div class="ttdoc">Evaluate any JIT expressions to generate data for the array.</div></div>
<div class="ttc" id="aclassaf_1_1exception_htm"><div class="ttname"><a href="classaf_1_1exception.htm">af::exception</a></div><div class="ttdoc">An ArrayFire exception class.</div><div class="ttdef"><b>Definition:</b> <a href="exception_8h_source.htm#l00021">exception.h:22</a></div></div>
<div class="ttc" id="aclassaf_1_1exception_htm_aa884ff67408851f00e50cf971a4dfd05"><div class="ttname"><a href="classaf_1_1exception.htm#aa884ff67408851f00e50cf971a4dfd05">af::exception::what</a></div><div class="ttdeci">virtual const char * what() const</div><div class="ttdoc">Returns an error message for the exception in a string format.</div><div class="ttdef"><b>Definition:</b> <a href="exception_8h_source.htm#l00046">exception.h:46</a></div></div>
<div class="ttc" id="anamespaceaf_htm"><div class="ttname"><a href="namespaceaf.htm">af</a></div><div class="ttdef"><b>Definition:</b> <a href="algorithm_8h_source.htm#l00014">algorithm.h:15</a></div></div>
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