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1 <html>
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2 <head>
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3
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4 <meta charset="UTF-8">
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5 <title>Javascript FFT speed test</title>
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6
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7 <style type="text/css">
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8 body { margin: 5%; }
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9 table, td, th { border: 0.1em solid #e0e0e0; border-collapse: collapse }
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10 td, th { padding: 0.5em }
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11 </style>
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12
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13 <script src="nayuki/fft.js"></script>
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14 <script src="nayuki-obj/fft.js"></script>
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15 <script src="fft.js/lib/complex.js"></script>
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16 <script src="jsfft/lib/complex_array.js"></script>
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17 <script src="jsfft/lib/fft.js"></script>
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18 <script src="cross/Cross.js"></script>
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19 <script src="cross/FFT.js"></script>
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20 <script src="kissfft/KissFFT.js"></script>
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21 <script src="kissfft/FFT.js"></script>
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22 <script src="fftw/FFTW.js"></script>
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23 <script src="fftw/FFT.js"></script>
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24 <script src="test.js"></script>
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25
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26 </head>
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27 <body>
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28
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29 <h3>Forward real-complex FFT speed test</h3>
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30
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31 <p id="test-description"></p>
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32
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33 <table>
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34 <tr>
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35 <th>Implementation</th><th>Result</th><th>Time (first half)</th><th>Time (second half)</th><th>Rate (second half)</th>
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36 </tr>
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37 <tr>
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38 <td>Nayuki</td><td id="nayuki-result"></td><td id="nayuki-1"></td><td id="nayuki-2"></td><td id="nayuki-itr"></td>
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39 </tr><tr>
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40 <td>Nayuki (obj)</td><td id="nayukiobj-result"></td><td id="nayukiobj-1"></td><td id="nayukiobj-2"></td><td id="nayukiobj-itr"></td>
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41 </tr><tr>
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42 <td>KissFFT</td><td id="kissfft-result"></td><td id="kissfft-1"></td><td id="kissfft-2"></td><td id="kissfft-itr"></td>
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43 </tr><tr>
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44 <td>Cross</td><td id="cross-result"></td><td id="cross-1"></td><td id="cross-2"></td><td id="cross-itr"></td>
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45 </tr><tr>
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46 <td>FFTW</td><td id="fftw-result"></td><td id="fftw-1"></td><td id="fftw-2"></td><td id="fftw-itr"></td>
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47 </tr><tr>
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48 <td>Nockert</td><td id="nockert-result"></td><td id="nockert-1"></td><td id="nockert-2"></td><td id="nockert-itr"></td>
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49 </tr><tr>
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50 <td>Dntj</td><td id="dntj-result"></td><td id="dntj-1"></td><td id="dntj-2"></td><td id="dntj-itr"></td>
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51 </tr>
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52 </table>
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53
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54 <h3>Notes</h3>
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55
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56 <ul>
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57 <li><b>Nayuki</b>: in-place single-precision complex-complex. Around 7kb.</li>
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58 <li><b>Nayuki (obj)</b>: Nayuki with the sin/cos tables pre-calculated on object construction. Around 4kb.</li>
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59 <li><b>Nockert</b>: double-precision real-complex. Around 25kb.</li>
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60 <li><b>Dntj</b>: double-precision complex-complex. Forward
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61 transform is scaled and I've scaled it back again here, which may
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62 introduce rounding error. Around 10kb.</li>
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63 <li><b>Cross</b>: double-precision real-complex in C, compiled
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64 with Emscripten. This is considered a slow implementation amongst
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65 native code ones. Around 60kb.</li>
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66 <li><b>KissFFT</b>: single-precision real-complex in C, compiled
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67 with Emscripten. A reasonably sophisticated implementation. Around
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68 70kb.</li>
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69 <li><b>FFTW</b>: single-precision real-complex in C, compiled with
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70 Emscripten. GPL licensed. Around 3Mb.</li>
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71 </ul>
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72
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73 </body>
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74
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