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annotate 2013/Sep-2013/24th.html @ 9:e4748bca1eb3

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mkdir 2013
author Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
date Tue, 14 Jan 2014 04:18:59 +0900
parents Sep-2013/24th.html@c9b2998eb516
children
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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1 <!DOCTYPE html>
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2
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3 <!--
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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4 Google HTML5 slide template
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5
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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6 Authors: Luke Mahé (code)
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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7 Marcin Wichary (code and design)
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8
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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9 Dominic Mazzoni (browser compatibility)
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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10 Charles Chen (ChromeVox support)
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11
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12 URL: http://code.google.com/p/html5slides/
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13 -->
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14
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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15 <html>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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16 <head>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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17 <title>2013-09-24</title>
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18
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19 <meta charset='utf-8'>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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20 <script
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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21 src='http://html5slides.googlecode.com/svn/trunk/slides.js'></script>
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22 </head>
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23
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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24 <style>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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25 /* Your individual styles here, or just use inline styles if that’s
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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26 what you want. */
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27 .slides article { background-image: none !important; background-color: white; }
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28
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29
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30 </style>
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31
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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32 <body style='display: none'>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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33
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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34 <section class='slides layout-regular template-default'>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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35
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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36 <!-- Your slides (<article>s) go here. Delete or comment out the
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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37 slides below.-->
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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38
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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39 <article>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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40 <h1>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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41 Ceriumによる
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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42 <br>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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43 正規表現マッチャの実装
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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44 </h1>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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45 <p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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46 Masataka Kohagura
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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47 <br>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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48 24th September , 2013
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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49 </p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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50 </article>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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51
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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52 <article>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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53 <h3>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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54 研究目的
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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55 </h3>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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56 <p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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57 本研究室では、Cell用に作られたCeriumにて並列プログラミングを行なっている。様々な例題を実装することにより、どのような問題でも並列処理ができることを証明する。
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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58 </p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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59 <p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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60 現在は文字列サーチを実装している段階で、ボイヤームーア法を実装している。
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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61 セミグループという、分割したファイルに対して並列処理をさせるような手法によって、既存の文字列サーチと処理速度を比較し、どれだけ速く、どれだけ効率よくなるのかを測定する。
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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62 </p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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63 <p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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64 並列処理は逐次処理よりも処理時間を短縮できる可能性があるが、I/O命令がボトルネックになる。
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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65 このボトルネックを軽減させるにはどのような処理をさせればよいのか考察し、処理全体の効率化の改善を図る。
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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66 </p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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67 </article>
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68
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69 <article>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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70 <h3>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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71 したこと
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72 </h3>
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73 <p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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74 ・SDLによる三角波、矩形波の実装
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75 </p>
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76 <p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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77 ・mmapをfreadへの書き換え
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78 </p>
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79 </article>
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80
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81 <article class='smaller'>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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82 <h3>波形</h3>
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83 <p>三角波</p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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84 <section><pre>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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85 double tri(double t){
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86
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87 double decimal_part = t - abs(t);
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88
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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89 if(abs(t) % 2 != 0){
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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90 return decimal_part < 0.5 ? decimal_part : 1 - decimal_part;
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91 }else{
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92 return decimal_part < 0.5 ? -decimal_part : 1 - decimal_part;
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93 }
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94 }
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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95 </pre></section>
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96
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97 <p>矩形波</p>
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98 <section><pre>
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99 double square(double t){
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100 double decimal_part = t - abs(t);
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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101 return decimal_part < 0.5 ? 1 : -1;
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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102 }
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103 </pre></section>
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104 </article>
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105
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106 <article class='smaller'>
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107 <h3>mmapからfreadへの書き換え(1)</h3>
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108 <p>変更前</p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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109 <section><pre>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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110 static st_mmap_t
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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111 my_mmap(char *filename)
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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112 {
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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113 int fd = -1;
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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114 int map = MAP_PRIVATE;
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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115 st_mmap_t st_mmap;
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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116 struct stat sb;
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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117
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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118 if ((fd=open(filename,O_RDONLY,0666))==0) {
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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119 fprintf(stderr,"can't open %s\n",filename);
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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120 }
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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121
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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122 if (fstat(fd,&sb)) {
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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123 fprintf(stderr,"can't fstat %s\n",filename);
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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124 }
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125
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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126 st_mmap.size = fix_byte(sb.st_size,4096);
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127
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128 st_mmap.file_mmap = (char*)mmap(NULL,st_mmap.size,PROT_READ,map,fd,(off_t)0); if (st_mmap.file_mmap == (caddr_t)-1) {
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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129 fprintf(stderr,"Can't mmap file\n");
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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130 perror(NULL);
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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131 exit(0);
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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132 }
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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133 return st_mmap;
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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134 }
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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135 </pre></section>
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136 </article>
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137
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138 <article class='smaller'>
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139 <h3>mmapからfreadへの書き換え(2)</h3>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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140 <p>変更後</p>
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141 <section><pre>
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142 my_fread(TaskManager *manager,char *filename)
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143 {
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144 FILE *fd;
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145 st_mmap_t st_mmap;
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146 struct stat sb;
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147
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148 if ((fd=fopen(filename,"r"))==NULL) {
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149 fprintf(stderr,"can't open %s\n",filename);
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150 }
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151
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152 if (fstat(fileno(fd),&sb)) {
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153 fprintf(stderr,"can't fstat %s\n",filename);
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154 }
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155
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156 st_mmap.size = fix_byte(sb.st_size,4096);
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157
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158 st_mmap.file_mmap = (char*)manager->allocate(st_mmap.size);
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159 fread(st_mmap.file_mmap,st_mmap.size,1,fd);
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160 if (st_mmap.file_mmap == (caddr_t)-1) {
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161 fprintf(stderr,"Can't mmap file\n");
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162 perror(NULL);
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163 exit(0);
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164 }
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165 return st_mmap;
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166 }
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167 </pre></section>
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168 </article>
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169 </body>
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170 </html>