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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 Oct-2013/1st.html@c9b2998eb516
children
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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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9 Dominic Mazzoni (browser compatibility)
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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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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>2013-10-01</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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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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24 <style>
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25 /* Your individual styles here, or just use inline styles if that’s
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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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32 <body style='display: none'>
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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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35
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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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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 正規表現の実装
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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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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 1st October , 2013
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49 </p>
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50 </article>
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51
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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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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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58 </p>
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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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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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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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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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66 </p>
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67 </article>
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68
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69
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70 <article class='smaller'>
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71 <h3>mmapからfreadへの書き換え(1)</h3>
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72 <p>変更前</p>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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73 <section><pre>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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74 static st_mmap_t
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75 my_mmap(char *filename)
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76 {
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77 int fd = -1;
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78 int map = MAP_PRIVATE;
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79 st_mmap_t st_mmap;
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80 struct stat sb;
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81
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82 if ((fd=open(filename,O_RDONLY,0666))==0) {
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83 fprintf(stderr,"can't open %s\n",filename);
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84 }
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85
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86 if (fstat(fd,&sb)) {
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87 fprintf(stderr,"can't fstat %s\n",filename);
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88 }
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89
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90 st_mmap.size = fix_byte(sb.st_size,4096);
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91
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92 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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93 fprintf(stderr,"Can't mmap file\n");
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94 perror(NULL);
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95 exit(0);
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96 }
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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97 return st_mmap;
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98 }
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99 </pre></section>
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100 </article>
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101
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102 <article class='smaller'>
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103 <h3>mmapからfreadへの書き換え(2)</h3>
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104 <p>変更後</p>
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105 <section><pre>
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106 my_fread(TaskManager *manager,char *filename)
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107 {
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108 FILE *fd;
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109 st_mmap_t st_mmap;
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110 struct stat sb;
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111
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112 if ((fd=fopen(filename,"r"))==NULL) {
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113 fprintf(stderr,"can't open %s\n",filename);
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114 }
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115
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116 if (fstat(fileno(fd),&sb)) {
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117 fprintf(stderr,"can't fstat %s\n",filename);
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118 }
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119
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120 st_mmap.size = fix_byte(sb.st_size,4096);
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121
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122 st_mmap.file_mmap = (char*)manager->allocate(st_mmap.size);
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123 fread(st_mmap.file_mmap,st_mmap.size,1,fd);
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124 if (st_mmap.file_mmap == (caddr_t)-1) {
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125 fprintf(stderr,"Can't mmap file\n");
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126 perror(NULL);
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127 exit(0);
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128 }
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129 return st_mmap;
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130 }
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131 </pre></section>
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132 </article>
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133 </body>
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134 </html>