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annotate OpenSourceConference/index.html @ 10:eaf3f3d169fe
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| author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
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| date | Thu, 08 Sep 2011 17:23:58 +0900 |
| parents | 95d46a58d75e |
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| rev | line source |
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| 0 | 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" |
| 2 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> | |
| 3 | |
| 4 <html xmlns="http://www.w3.org/1999/xhtml"> | |
| 5 | |
| 6 <head> | |
| 7 <style> | |
| 8 .center { | |
| 9 margin-left: auto; | |
| 10 margin-right: auto; | |
| 11 text-align: center; | |
| 12 } | |
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13 .textcenter { |
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14 text-align: center; |
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15 } |
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| 0 | 17 </style> |
| 18 <title>2011/9/6</title> | |
| 19 <!-- metadata --> | |
| 20 <meta name="generator" content="S5" /> | |
| 21 <meta name="version" content="S5 1.1" /> | |
| 22 <meta name="presdate" content="20110906" /> | |
| 23 <meta name="author" content="Nobuyasu Oshiro" /> | |
| 24 <meta name="company" content="University of the Ryukyu" /> | |
| 25 <!-- meta temporary --> | |
| 26 <meta http-equiv="content-type" content="text/html; charset=utf-8" /> | |
| 27 <meta http-equiv="Content-Script-Type" content="text/javascript" /> | |
| 28 <meta http-equiv="Content-Style-Type" content="text/css" /> | |
| 29 <!-- configuration parameters --> | |
| 30 <meta name="defaultView" content="slideshow" /> | |
| 31 <meta name="controlVis" content="hidden" /> | |
| 32 <!-- configuration extensions --> | |
| 33 <meta name="tranSitions" content="true" /> | |
| 34 <meta name="fadeDuration" content="500" /> | |
| 35 <meta name="incrDuration" content="250" /> | |
| 36 <!-- configuration autoplay extension --> | |
| 37 <meta name="autoMatic" content="false" /> | |
| 38 <meta name="playLoop" content="true" /> | |
| 39 <meta name="playDelay" content="10" /> | |
| 40 <!-- configuration audio extension --> | |
| 41 <meta name="audioSupport" content="false" /> | |
| 42 <meta name="audioVolume" content="100" /> | |
| 43 <meta name="audioError" content="false" /> | |
| 44 <!-- configuration audio debug --> | |
| 45 <meta name="audioDebug" content="false" /> | |
| 46 <!-- style sheet links --> | |
| 47 <link rel="stylesheet" href="ui/default_utf/slides.css" type="text/css" media="projection" id="slideProj" /> | |
| 48 <link rel="stylesheet" href="ui/default_utf/outline.css" type="text/css" media="screen" id="outlineStyle" /> | |
| 49 <link rel="stylesheet" href="ui/default_utf/print.css" type="text/css" media="print" id="slidePrint" /> | |
| 50 <link rel="stylesheet" href="ui/default_utf/opera.css" type="text/css" media="projection" id="operaFix" /> | |
| 51 <!-- embedded styles --> | |
| 52 <style type="text/css" media="all"> | |
| 53 .imgcon {width: 100%; margin: 0 auto; padding: 0; text-align: center;} | |
| 54 #anim {width: 33%; height: 320px; position: relative;} | |
| 55 #anim img {position: absolute; top: 0px; left: 0px;} | |
| 56 </style> | |
| 57 <!-- S5 JS --> | |
| 58 <script src="ui/default_utf/slides.js" type="text/javascript"></script> | |
| 59 </head> | |
| 60 <body> | |
| 61 | |
| 62 <div class="layout"> | |
| 63 <div id="controls"><!-- DO NOT EDIT --></div> | |
| 64 <div id="currentSlide"><!-- DO NOT EDIT --></div> | |
| 65 <div id="header"></div> | |
| 66 <div id="footer"> | |
| 67 <h1>ゼミ: 2011/ 9/ 6</h1> | |
| 68 <h2>並列信頼研</h2> | |
| 69 </div> | |
| 70 </div> | |
| 71 | |
| 72 <div class="presentation"> | |
| 73 | |
| 74 | |
| 75 <div class="slide"> | |
| 76 <h1>Java による授業向け画面共有システムの設計と実装 </li> | |
| 77 <h3></h3> | |
| 78 <li>大城 信康 谷成 雄</li> | |
| 79 <h4><a href="http://ie.u-ryukyu.ac.jp/" rel="external">琉球大学 並列信頼研究室</a></h4> | |
| 80 <div class="handout"></div> | |
| 81 </div> | |
| 82 | |
| 83 | |
| 84 <!-- PAGE --> | |
| 85 <div class="slide"> | |
| 86 <h1>目的と背景</h1> | |
| 87 <li>大学の講義中、スクリーンに映されている画面は後ろの席程見えずらい。 </li> | |
| 88 <li>その問題を手元のPCにも写せるようにすることで解決しようと考えた。</li> | |
| 89 <li class="incremental">60人以上での画面共有を行うことを目標とする。</li> | |
| 90 </div> | |
| 91 <!-- PAGE --> | |
| 92 <div class="slide"> | |
| 93 <h1>VNCを用いての画面共有</h1> | |
| 94 <li>画面を共有する方法 -> VNC</li> | |
| 95 <li>VNC: Virtual Network Computing </br>ネットワークを介してコンピュータを遠隔操作するプログラム </li> | |
| 96 <li>VNCのリモートPCの画面を写す機能を利用する。</li> | |
| 97 </div> | |
| 98 <!-- PAGE --> | |
| 99 <div class="slide"> | |
| 100 <h1>通常のVNCの問題点</h1> | |
| 101 <table class="center"> | |
| 102 <tr> | |
| 103 <td width=50% > | |
| 104 <p style="text-aline: center;" > | |
| 105 <img clas="scale" src="./pix/NormalVNC3.png" width="450"> | |
| 106 </p> | |
| 107 </td> | |
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108 <td width=50% style="text-align: left;"> |
| 0 | 109 <li><small>VNC Serverの負荷が重い。</small></li> |
| 110 <li><small>Server側の通信網1本への通信負荷が高い。</small></li> | |
| 111 </td> | |
| 112 </tr> | |
| 113 </table> | |
| 114 </div> | |
| 115 <!-- PAGE --> | |
| 116 <div class="slide"> | |
| 117 <h1>通常のVNCの問題点</h1> | |
| 118 <p style="text-align: center;"> | |
| 119 <li> | |
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120 <samll>1台と48台でVNCをかけた時のスループットとサーバ側のCPU使用率</small> |
| 0 | 121 </li> |
| 122 </p> | |
| 123 <table class="center" class="incremental" border=1> | |
| 124 <tr> | |
| 125 <td></td> | |
| 126 <td>スループット(単位:Byte)</td> | |
| 127 <td>CPU使用率</td> | |
| 128 </tr> | |
| 129 | |
| 130 <tr> | |
| 131 <td>1台</td> | |
| 132 <td>20M</td> | |
| 133 <td>15%</td> | |
| 134 </tr> | |
| 135 | |
| 136 <tr> | |
| 137 <td>48台</td> | |
| 138 <td>0.4M</td> | |
| 139 <td>100%</td> | |
| 140 </tr> | |
| 141 </table> | |
| 142 <li>VNCに使われるCPUの使用率が100%になり、スループットが5分の1まで下がっている。</li> | |
| 143 | |
| 144 </div> | |
| 145 <!-- PAGE --> | |
| 146 <div class="slide"> | |
| 147 <h1>VNCの問題点の解決策</h1> | |
| 148 <p style="text-align: center;"> | |
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149 <small>クライアントを木構造で接続させる</samll><br> |
| 0 | 150 <img class="scale" src="./pix/TreeVNC0.png" width="500" heigth="500"><br> |
| 151 </p> | |
| 152 </div> | |
| 153 <!-- PAGE --> | |
| 154 <div class="slide"> | |
| 155 <h1>TreeVNCの利点</h1> | |
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156 <table class="center" width=100% style="text-align: center;"> |
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157 <tr> |
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158 <td><small>通常のVNC</small></td> |
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159 <td><small>TreeVNC</small></td> |
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160 </tr> |
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161 <tr> |
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162 <td> |
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163 <img class="scale" src="./pix/NormalVNC3.png" width="300"> |
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164 </td> |
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165 <td> |
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166 <img src="./pix/TreeVNC3.png" width="300"> |
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167 </td> |
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168 </tr> |
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169 </p> |
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170 </table> |
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171 <li>クライアントが増えてもかかる負荷一定。</li> |
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172 <li>通信網1本に対する負荷が減り、安定した通信ができる(有線)。</li> |
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173 </div> |
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174 </div> |
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175 <!-- PAGE --> |
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176 <div class="slide"> |
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177 <h1>TreeVNCの利点</h1> |
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178 <table class="center" width=100% style="text-align: center;"> |
| 0 | 179 <tr> |
| 180 <td><small>通常のVNC</small></td> | |
| 181 <td><small>TreeVNC</small></td> | |
| 182 </tr> | |
| 183 <tr> | |
| 184 <td> | |
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185 <img class="scale" src="./pix/NormalVNC3.png" width="300"> |
| 0 | 186 </td> |
| 187 <td> | |
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188 <img src="./pix/TreeVNC3.png" width="300"> |
| 0 | 189 </td> |
| 190 </tr> | |
| 191 </p> | |
| 192 </table> | |
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193 <table class="center" border=1 cellspacing="0" width=80%> |
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194 <tr> |
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195 <td></td> |
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196 <td>通常のVNC</td> |
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197 <td>TreeVNC</td> |
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198 </tr> |
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199 <tr> |
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200 <td>最大負荷</td> |
| 5 | 201 <td> N * データ量 (クライアントの数に比例) </td> |
| 202 <td> (M+1) * データ量</td> | |
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203 </tr> |
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204 </table> |
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205 <p style="text-align: center;"><small>クライアントの数をN、木構造の子供の数をMとする</small> </p> |
| 0 | 206 </div> |
| 207 </div> | |
| 208 <!-- PAGE --> | |
| 209 <div class="slide"> | |
| 210 <h1>TreeVNCの設計</h1> | |
| 211 <li>TreeVNCのクライアントは最初にTop Proxyに接続を行う。</li> | |
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212 <li>データは木の下へと流れていく。</li> |
| 0 | 213 <li>tightVNC ViewerのJava版(ver 1.3)を元にTreeVNCの実装を行う。</li> |
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214 <p style="text-align: center;"> |
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215 <img class="scale" src="./pix/TreeVNC0.png" width="500" heigth="500"> |
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216 </p> |
| 0 | 217 </div> |
| 218 <!-- PAGE --> | |
| 219 <div class="slide"> | |
| 220 <h1>発表内容</h1> | |
| 221 <ul> | |
| 222 <li>RFB Protocol</li> | |
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223 <li>データ転送量</li> |
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224 <li>ZRLE Encodingの問題</li> |
| 0 | 225 <li>データ転送に用いたMulticastQueueについての説明</li> |
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226 <!-- <li>TreeVNCのデモ</li> --> |
| 0 | 227 <li>木構造の再構築</li> |
| 228 </ul> | |
| 229 </div> | |
| 230 <!-- PAGE --> | |
| 231 <div class="slide"> | |
| 232 <h1>RFB protocol</h1> | |
| 233 <li>Remote Frame Buffer Protocol : <br>GUI操作によるリモートアクセス用の通信プロトコル。VNCで用いられる。</li> | |
| 234 <li>転送される画面(フレームバッファ)のデータは変更があった部分(差分)だけが矩形単位で送られる。</li> | |
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235 <table class="center" width=100%> |
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236 <tr> |
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237 <td> |
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239 </td> |
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240 <td> |
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241 <img src="./pix/rightArrow.png"> |
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242 </td> |
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243 <td> |
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245 </td> |
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246 </tr> |
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247 </table> |
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248 <small> |
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249 <p style="text-align: center;"><font color=red>□ </font>で囲まれている矩形のデータだけが送られてくる。 </p> |
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250 </small> |
| 0 | 251 </div> |
| 252 <!-- PAGE --> | |
| 253 <div class="slide"> | |
| 254 <h1>VNC のシーケンス図</h1> | |
| 255 <table class="scale" width=100% > | |
| 256 <tr> | |
| 257 <td width=50%> | |
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258 <img class="scale" src="./pix/VNC-Sequence-.png" height=80%> |
| 0 | 259 </td> |
| 260 <td width=50% align="left"> | |
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261 <small> |
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262 <li><font color=blue>1~5</font>まではinitial seaquenceとなる。</li> |
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263 <li><font color=orange>6</font>以降は繰り返し行われる処理。画面のデータが転送されてくる。</li> |
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264 </small> |
| 0 | 265 </td> |
| 266 </tr> | |
| 267 </table> | |
| 268 </div> | |
| 269 <!-- PAGE --> | |
| 270 <div class="slide"> | |
| 271 <h1>RFB Protocol</h1> | |
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272 <li>FramebufferUpdateRequest:</li> |
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273 <li><small>画面に差分が発生したらサーバから教えて貰うためのリクエスト</small></li> |
| 0 | 274 <small> |
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275 <table> |
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277 <table border=1 cellspacing="0"> |
| 0 | 278 <tr> |
| 279 <td>バイト数</td> | |
| 280 <td><pre>型 [値]</pre></td> | |
| 281 <td>説明 </td> | |
| 282 </tr> | |
| 283 | |
| 284 <tr> | |
| 285 <td>1</td> | |
| 286 <td><pre>U8 3</pre></td> | |
| 287 <td>message-type </td> | |
| 288 </tr> | |
| 289 | |
| 290 <tr> | |
| 291 <td>1</td> | |
| 292 <td><pre>U8<pre></td> | |
| 293 <td>incremental</td> | |
| 294 </tr> | |
| 295 | |
| 296 <tr> | |
| 297 <td>2</td> | |
| 298 <td><pre>U16<pre></td> | |
| 299 <td>x-position</td> | |
| 300 </tr> | |
| 301 | |
| 302 <tr> | |
| 303 <td>2</td> | |
| 304 <td><pre>U16<pre></td> | |
| 305 <td>y-position</td> | |
| 306 </tr> | |
| 307 | |
| 308 <tr> | |
| 309 <td>2</td> | |
| 310 <td><pre>U16<pre></td> | |
| 311 <td>width</td> | |
| 312 </tr> | |
| 313 | |
| 314 <tr> | |
| 315 <td>2</td> | |
| 316 <td><pre>U16<pre></td> | |
| 317 <td>height</td> | |
| 318 </tr> | |
| 319 | |
| 320 </table> | |
| 321 </td> | |
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322 </table> |
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323 <li>このリクエストはTop Proxyだけが行う。 </li> |
| 0 | 324 </small> |
| 325 </div> | |
| 326 <!-- PAGE --> | |
| 327 <div class="slide"> | |
| 328 <h1>RFB Protocol</h1> | |
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329 <li>FramebufferUpdate: <small>画面の更新データ</small></li> |
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330 |
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332 <table border=1 cellspacing="0" > |
| 0 | 333 <tr> |
| 334 <td>バイト数</td> | |
| 335 <td><pre>型 [値]</pre></td> | |
| 336 <td>説明 </td> | |
| 337 </tr> | |
| 338 | |
| 339 <tr> | |
| 340 <td>1</td> | |
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341 <td><pre>U8 0</pre></td> |
| 0 | 342 <td>message-type </td> |
| 343 </tr> | |
| 344 | |
| 345 <tr> | |
| 346 <td>1</td> | |
| 347 <td><pre>U8<pre></td> | |
| 348 <td>padding</td> | |
| 349 </tr> | |
| 350 | |
| 351 <tr> | |
| 352 <td>2</td> | |
| 353 <td><pre>U16<pre></td> | |
| 354 <td>number-of-rectangles</td> | |
| 355 </tr> | |
| 356 | |
| 357 </table> | |
| 358 <li>以下number-of-rectanglesの数だけ矩形のデータが続く</li> | |
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359 |
| 0 | 360 <table width=100%> |
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361 <td> |
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362 <table border=1 cellspacing="0" width=50%> |
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363 <tr> |
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364 <td>バイト数</td> |
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365 <td><pre>型 </pre></td> |
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366 <td>説明 </td> |
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367 </tr> |
| 0 | 368 |
| 369 <tr> | |
| 370 <td>2</td> | |
| 371 <td><pre>U16<pre></td> | |
| 372 <td>x-position</td> | |
| 373 </tr> | |
| 374 | |
| 375 <tr> | |
| 376 <td>2</td> | |
| 377 <td><pre>U16<pre></td> | |
| 378 <td>y-position</td> | |
| 379 </tr> | |
| 380 | |
| 381 <tr> | |
| 382 <td>2</td> | |
| 383 <td><pre>U16<pre></td> | |
| 384 <td>width</td> | |
| 385 </tr> | |
| 386 | |
| 387 <tr> | |
| 388 <td>2</td> | |
| 389 <td><pre>U16<pre></td> | |
| 390 <td>height</td> | |
| 391 </tr> | |
| 392 | |
| 393 <tr> | |
| 394 <td>4</td> | |
| 395 <td><pre>U32<pre></td> | |
| 396 <td>encoding-type</td> | |
| 397 </tr> | |
| 398 | |
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399 <tr> |
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400 <td>...</td> |
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401 <td><pre>...<pre></td> |
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402 <td>PIXEL DATA</td> |
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403 </tr> |
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404 |
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405 |
| 0 | 406 </table> |
| 407 </td> | |
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408 <td> |
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409 </td> |
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| 411 </table> | |
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412 |
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413 |
| 0 | 414 </small> |
| 415 </div> | |
| 416 <!-- PAGE --> | |
| 417 <div class="slide"> | |
| 418 <h1>RFB Protocol</h1> | |
| 5 | 419 <li style="text-align: center;"><small>例:FramebufferUpdate</small></li> |
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420 <table class="center" border=1 cellspacing="0" width=50%> |
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421 <tr> |
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422 <td>x-position</td> |
| 5 | 423 <td>336</td> |
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424 </tr> |
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425 |
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426 <tr> |
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427 <td>y-position</td> |
| 5 | 428 <td>388</td> |
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429 </tr> |
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430 |
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431 <tr> |
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432 <td>width</td> |
| 5 | 433 <td>724</td> |
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434 </tr> |
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435 |
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436 <tr> |
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437 <td>height</td> |
| 5 | 438 <td>449</td> |
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439 </tr> |
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440 |
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441 <tr> |
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442 <td>encoding-type</td> |
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443 <td>16(ZRLE)</td> |
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444 </tr> |
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445 |
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446 <tr> |
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447 <td>ZRLE</td> |
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448 <td>...</td> |
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449 </tr> |
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450 </table> |
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451 |
| 5 | 452 <table class="center"> |
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453 <tr> |
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454 <td> |
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456 </td> |
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457 <td> |
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458 <img src="./pix/rightArrow.png"> |
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459 </td> |
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460 <td> |
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462 </td> |
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463 </tr> |
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464 </table> |
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465 |
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466 </div> |
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| 468 <div class="slide"> | |
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469 <h1>データ転送量</h1> |
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470 <p style="text-align: center;"> |
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471 <small>矩形の大きさと描画に必要なデータ量(単位:Byte)</small> |
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472 </p> |
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473 <table class="center" border=1 cellspacing="0" width=80%> |
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474 <tr> |
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475 <td>矩形の大きさ \ エンコード</td> |
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476 <td>RAW</td> |
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477 <td>ZRLE</td> |
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478 </tr> |
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479 |
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480 <tr> |
| 5 | 481 <td>724 * 449</td> |
|
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482 <!-- |
| 5 | 483 <td>1300304</td> |
| 484 <td>796642</td> | |
|
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485 --> |
| 5 | 486 <td>1.3M</td> |
| 487 <td>0.8M</td> | |
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488 </tr> |
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489 |
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490 <tr> |
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491 <td>1920 * 64</td> |
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492 <!-- |
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493 <td>491520</td> |
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494 <td>309602</td> |
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495 --> |
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496 <td>0.5M</td> |
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497 <td>0.15M</td> |
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498 </tr> |
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499 |
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500 <tr> |
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501 <td>1920 * 1080</td> |
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502 <!-- |
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503 <td>8294400</td> |
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504 <td>3472780</td> |
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505 --> |
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506 <td>8.2M</td> |
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507 <td>3.4M</td> |
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508 </tr> |
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509 |
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510 </table> |
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511 |
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512 <p style="text-align: center;"> |
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513 <img src="./pix/dataLength.png" width="450" heigth="325"> <br> |
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514 <small>RAW、ZRLE、ZRLEEエンコードのデータ量の比較</small> |
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515 </p> |
| 0 | 516 </div> |
| 517 <!-- PAGE --> | |
| 518 <div class="slide"> | |
| 5 | 519 <h1>データ転送量</h1> |
| 520 <li>クライアントが60台の時の通常のVNCと、２分木構成にしたTreeVNCの通信網への負荷について考える。</li> | |
| 521 <table class="center" border=1 cellspacing="0" width=80%> | |
| 522 <tr> | |
| 523 <td></td> | |
| 524 <td>通常のVNC</td> | |
| 525 <td>TreeVNC</td> | |
| 526 </tr> | |
| 527 <tr> | |
| 528 <td>最大負荷</td> | |
| 529 <td> N * データ量(クライアントの数に比例) </td> | |
| 530 <td> (M+1) * データ量</td> | |
| 531 </tr> | |
| 532 </table> | |
| 533 <p style="text-align: center;"><small>クライアントの数をN、木構造の子供の数をMとする</small> </p> | |
| 534 <li>N = 60、 M = 1 となる。</li> | |
| 535 <li>724 * 449 の画面分のデータ(0.8M)を送信するとする。 </li> | |
| 536 | |
|
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537 </div> |
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538 <!-- PAGE --> |
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539 <div class="slide"> |
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540 <h1>データ転送量</h1> |
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541 <li></li> |
| 5 | 542 <table class="center" border=1 cellspacing="0" width=80%> |
| 543 <tr> | |
| 544 <td></td> | |
| 545 <td>通常のVNC</td> | |
| 546 <td>TreeVNC</td> | |
| 547 </tr> | |
| 548 <tr> | |
| 549 <td>最大負荷</td> | |
| 550 <td>48M</td> | |
| 551 <td>2.4M</td> | |
| 552 </tr> | |
| 553 </table> | |
| 554 | |
| 555 <table class="center" width=100% style="text-align: center;"> | |
| 556 <tr> | |
| 557 <td><small>通常のVNC</small></td> | |
| 558 <td><small>TreeVNC</small></td> | |
| 559 </tr> | |
| 560 <tr> | |
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561 <td width=50%> |
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562 <img class="scale" src="./pix/NormalVNC4.png"> |
| 5 | 563 </td> |
| 564 <td> | |
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565 <img src="./pix/TreeVNC5.png"> |
| 5 | 566 </td> |
| 567 </tr> | |
| 568 </p> | |
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569 </table> |
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570 <small> |
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571 <p style="text-align: center">クライアント:60台 TreeVNCは2分木でTreeを構成 </p> |
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572 </small> |
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573 </div> |
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574 <!-- PAGE --> |
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575 <div class="slide"> |
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576 <h1>エンコード</h1> |
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577 <li>MacintoshでVNCを行うとZRLEを使うことができる。</li> |
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578 <li>データ量がRAWデータの約4分の1のデータ量ですむ。</li> |
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579 <li class="incremental">TreeVNCではこのZRLEを扱っている。</li> |
| 5 | 580 </div> |
| 0 | 581 <!-- PAGE --> |
| 582 <div class="slide"> | |
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583 <h1>ZRLE</h1> |
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584 <li>ZRLE : Zlib Run-Length Encoding </li> |
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585 <ul> |
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586 <li>Zlib圧縮(gzip)されたデータ扱うエンコーディング。</li> |
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587 </ul> |
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588 <li>最初の4バイトにはZlibのデータの長さが、続いてZlibのデータが送られてくる。</li> |
| 0 | 589 <small> |
|
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590 <table border=1 width=50% cellspacing="0"> |
| 0 | 591 <tr> |
| 592 <td>バイト数</td> | |
|
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593 <td><pre>型 </pre></td> |
| 0 | 594 <td>説明 </td> |
| 595 </tr> | |
| 596 <tr> | |
| 597 <td>4</td> | |
| 598 <td>U32</td> | |
| 599 <td>length</td> | |
| 600 </tr> | |
| 601 <tr> | |
| 602 <td>length</td> | |
| 603 <td>U8 array</td> | |
| 604 <td>zlibData</td> | |
| 605 </tr> | |
| 606 </table> | |
| 607 </small> | |
|
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608 |
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609 <li>Zlibデータ</li> |
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610 <ul> |
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611 <li>Zlibデータは辞書を元にデータの解凍を行う</li> |
| 0 | 612 </ul> |
|
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613 <li class="incremental">辞書がなければデータを正しく解凍できない</li> |
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614 </div> |
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615 <!-- PAGE --> |
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616 <div class="slide"> |
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617 <h1>ZRLEの問題</h1> |
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618 <li>辞書はZlibデータの最初に送られてくる。</li> |
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619 <li>ZRLEのデータを最初から送ることができれば、辞書も送ることができる。</li> |
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620 <li>データの途中から送ると辞書は送られず、正しく解凍を行うことができない。</li> |
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621 <table class="textcenter" width=100%> |
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622 <tr> |
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623 <td> |
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624 <img src="./pix/ZRLE.png" width="600" > |
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625 </td> |
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626 <td> |
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627 <img src="./pix/ZRLE2.png" width="600" > |
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628 </td> |
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629 </tr> |
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630 </table> |
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631 </div> |
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632 <!-- PAGE --> |
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633 <div class="slide"> |
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634 <h1>ZRLEE</h1> |
| 9 | 635 <li>そこで、Top ProxyにZRLEのデータを再度圧縮し直すことで辞書を付けてもらうことにした。以下はその部分のソースである。</li> |
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636 <small> |
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637 <pre> |
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638 Deflater nDeflater = deflater; // new Deflater(); |
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639 LinkedList<ByteBuffer> out = new LinkedList<ByteBuffer>(); |
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640 unzip(inflater, inputs, 0 , out, INFLATE_BUFSIZE); |
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641 // dump32(inputs); |
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642 int len2 = zip(nDeflater, out, 0, bufs); |
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643 </pre> |
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644 </small> |
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645 <li>一度再圧縮してしまえば後はどこからデータを流しても問題ない。</li> |
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646 <table class="textcenter" width=100%> |
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647 <tr> |
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648 <td> |
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649 <img src="./pix/ZRLEE2.png" width="600"> |
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650 </td> |
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651 <td> |
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652 <img src="./pix/ZRLEE3.png" width="600"> |
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653 </td> |
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654 </tr> |
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655 </table> |
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656 </div> |
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657 <!-- PAGE --> |
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658 <div class="slide"> |
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659 <h1>ZRLEE</h1> |
| 9 | 660 <li>クライアント側は毎回新しいZRLEのストリームを使うようにする。</li> |
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661 <pre> |
| 9 | 662 if (rfb.updateRectEncoding==RfbProto.EncodingZRLEE) |
| 663 zrleInStream = null; | |
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664 if (zrleInStream == null) |
| 9 | 665 zrleInStream = new ZlibInStream(); |
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666 </pre> |
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667 <li>JavaではZlibの辞書の取り出しが実装されていなかった為、このような方法をとることになった。</li> |
| 0 | 668 </div> |
| 669 <!-- PAGE --> | |
| 670 <div class="slide"> | |
| 671 <h1>MulticastQueue</h1> | |
| 672 <li>MulticastQueueの図を入れる。 </li> | |
| 673 <p style="text-align: center;"> | |
| 674 <small> | |
| 675 接続されてきた時点からデータの送信が始まる。データは読み込まれるまでメモリ上に残っている。 | |
| 676 </small> | |
| 677 </p> | |
| 678 </div> | |
| 679 <!-- PAGE --> | |
| 680 <div class="slide"> | |
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681 <h1>MulticastQueue</h1> |
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682 <li>MulticastQueueからデータを取り出し子供に送っている部分のソース</li> |
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683 <pre> |
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684 LinkedList<ByteBuffer> bufs = c.poll(); |
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685 int inputIndex = 0; |
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686 ByteBuffer header = bufs.get(inputIndex); |
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687 if (header==null) continue; |
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688 writeToClient(os, bufs, inputIndex); |
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689 </pre> |
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690 <li>c.poll(inputIndex) 内部では次の処理を行っている。</li> |
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691 <pre> |
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692 latch.await(); |
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693 return next; |
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694 </pre> |
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695 <li>次のデータが用意できるまでawait()で待つのである。</li> |
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696 </div> |
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697 <!-- PAGE --> |
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698 <div class="slide"> |
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699 <h1>MulticastQueue</h1> |
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700 <li>データは作られるとMulticastQueueにputされる。</li> |
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701 <p><small>put内部ではつぎの処理が行われる。</small></p> |
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702 <pre> |
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703 Node<T> next = new Node<T>(item); |
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704 tail.set(next); |
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705 tail = next; |
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706 </pre> |
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707 |
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708 <small> |
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709 <p> |
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710 set()内部ではlatchがcountDown()され、await()で止まっていたスレッドが動き出す。 |
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711 </small> |
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712 </div> |
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713 <!-- PAGE --> |
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714 <div class="slide"> |
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715 <h1>MulticastQueue</h1> |
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716 <li>MulticastQueueは次の次のデータへの参照を順序良く行うためのクラスである。</li> |
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717 <li></li> |
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718 |
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719 <li>MulticastQueueはjava.util.CountDownLatchを用いて実装されたクラスである。 </li> |
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720 <li>クライアントから接続されると、データ転送用のスレッド(sender)が走る。 </li> |
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721 <li>このスレッドは次に流すデータが来るまでは待機して置かなければならない。そして流すべきデータがくるとまた動き始めなければならない。</li> |
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722 <li>このスレッドの待機・解放を行うのがMulticastQueueとなる。 </li> |
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723 <!-- |
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724 <small> |
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725 <li>CountDownLatchはカウントを用いてスレッドの待機と解放を行えるクラスである。</li> |
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726 </small> |
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727 --> |
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728 </div> |
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729 <!-- PAGE --> |
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730 <div class="slide"> |
| 0 | 731 <h1>MulticastQueueの問題点</h1> |
| 732 <li>Clientがデータを読み込まないとデータが溜まりメモリを圧迫してしまう。 </li> | |
| 733 <p style="text-align: center;"> | |
| 734 <img src="./pix/TimeOut1.png"> | |
| 735 </p> | |
| 736 </div> | |
| 737 <!-- PAGE --> | |
| 738 <div class="slide"> | |
| 739 <h1>MulticastQueueの問題点</h1> | |
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740 <li>TimeOut(TO)スレッドを走らせ、一定の時間データを読み込まなければ代わりにこのTOが読み込むようにする。</li> |
| 0 | 741 <p style="text-align: center;"> |
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742 <img src="./pix/TimeOut2.png"><br> |
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743 解決策 |
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744 </p> |
| 0 | 745 </div> |
| 746 <!-- PAGE --> | |
| 747 <div class="slide"> | |
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748 <h1>テスト環境の構築</h1> |
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749 <li>CUI版のVNCクライアントを作成</li> |
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750 <li>48台あるクラスタでCUI版のクライアントをはしらせてVNCをかけさせる。</li> |
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751 <li>最初の1台目と48台めをGUI版のクライアントで接続を行い見比べてみる。 </li> |
| 0 | 752 </div> |
| 753 <!-- PAGE --> | |
| 754 <div class="slide"> | |
|
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755 <h1>TreeVNCの発端</h1> |
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756 <li>大学のB3でうける授業の1つ、programming4で作り始めたことがきっかけ。</li> |
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757 <li>programming4は作りたいものを提案して作る授業。 </li> |
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758 <li>授業が終わっても改良を加えていた。</li> |
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759 <li>B4になりこの場で発表してみることになった。</li> |
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| 761 <!-- PAGE --> | |
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762 <!-- |
| 0 | 763 <div class="slide"> |
| 764 <h1>既存のプログラムとの比較</h1> | |
| 765 <li>VNC Reflector</li> | |
| 766 <ul> | |
| 767 <li>tightVNCの作者が作成したプログラム</li> | |
| 768 <li>VNC Reflecotrにクライアントが接続することでVNCを行うことができる</li> | |
| 769 </ul> | |
| 770 </div> | |
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771 --> |
| 0 | 772 <!-- PAGE --> |
| 773 </div> | |
| 774 </body> | |
| 775 </html> |