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author Yuhi TOMARI <yuhi@cr.ie.u-ryukyu.ac.jp>
date Tue, 12 Aug 2014 17:11:48 +0900
parents 3d5fd010131d
children 220243d8ef68
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    <title>Seminar</title>

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    <div class="layout">
      <div id="header"></div>
      <div id="footer">
        <div align="right">
          <img src="images/concurrency.png" width="200">
        </div>
      </div>
    </div>

    <div class="presentation">

      <!-- add slides here; example -->
      
      <div class='slide cover'>
        <table width="90%" height="90%" border="0" align="center">
          <tr>
            <td><div align="center">
                <h1><font color="#808db5">CeriumにおけるGPGPUの最適化</font></h1>
            </div></td>
          </tr>
          <tr>
            <td><div align="left">
                Yuhi TOMARI
                <script>
                  var date = new Date();
                  var year = date.getFullYear();
                  var month = date.getMonth();
                  var day = date.getDate();
                  
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                  "July","August","September","October","November","December");
                  
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                <hr style="color:#ffcc00;background-color:#ffcc00;text-align:left;border:none;width:300%;height:0.2em;">
            </div></td>
          </tr>
        </table>
      </div>
      
      <div class='slide'>
        <h2>研究目的</h2>
        <p>
          当研究室ではCellおよびLinux、
          Mac OSX上で動く並列プログラミングフレームワーク、
          Ceriumの開発・改良を行っている。
        </p>
        <p>本研究では新たにGPU上での並列実行に対応し、
          ヘテロジニアス(異種混合)環境下でのプログラミングをサポートする
        </p>
        <p>
          GPGPUでは通常のマルチコア<font color="red">CPUとは異なる並列プログラミング</font>
          と<font color="red">特別なチューニング</font>が必要となる。
          そこでCeriumを用いてその差を吸収し、自動的なチューニングを可能にする。
        </p>
      </div>

      <div class='slide'>
        <h2>進捗</h2>
        <ul>
          <li><dt>CPU固定でthreadを生成するAPI</dt></li>
          <li><dt>glibcの環境構築</dt>
            <dd>実はまだgcc...</dd></li>
        </ul>
      </div>

      <div class='slide'>
        <h2>CPU固定でthreadを生成するAPI(Linux)</h2>
        <pre class="code">
int sched_setaffinity(pid_t pid,
    size_t cpusetsize, const cpu_set_t *mask);
        </pre>
        
        <ul>
          <li><dt>affinity(親和度、cpu_set_t)は、そのスレッドが実行を許可されているCPUの集合を決定する
              <dd>maskにCPUをsetするときは、CPU_SETを使用する(例:CPU_SET(cpu_id,&mask)</dd></dt></li>
          <li><dt>スレッドのaffinityマスクを一つのCPUに設定し、スレッドをCPUに括りつけることができる(Man page)</dt></li>
        </ul>
      </div>

      <div class='slide'>
        <h2>sched_setaffinity Sample</h2>
        <pre class="code">
void
bind_cpu()
{
    cpu_set_t mask;
    __CPU_ZERO(&mask);

    char *p = getenv("BIND_CPU_ID");
    int cpu_id = atoi(p);
    __CPU_SET(cpu_id, &mask);
    sched_setaffinity(0, sizeof(mask), &mask)
}</pre>
        <p>sarコマンドで確認できるらしい……</p>
        こんな感じ
        <pre>
% sar -P ALL 1 1000

17:51:28          CPU     %user     %nice   %system   %iowait    %steal     %idle
17:51:29          all     50.00      0.00      0.00      0.00      0.00     50.00
17:51:29            0      0.00      0.00      0.00      0.00      0.00    100.00
17:51:29            1    100.00      0.00      0.00      0.00      0.00      0.00

17:51:29          CPU     %user     %nice   %system   %iowait    %steal     %idle
17:51:30          all     50.25      0.00      0.00      0.00      0.00     49.75
17:51:30            0      0.00      0.00      0.00      0.00      0.00    100.00
17:51:30            1    100.00      0.00      0.00      0.00      0.00      0.00
          </pre>
      </div>

      <div class='slide'>
        <h2>CPU固定でthreadを生成するAPI(OSX)</h2>
        <p>apple developerのKernel Programming Guide</p>
      </div>

      <div class='slide'>
        <h2>glibc 環境構築</h2>
        <p>install</p>
        <pre class="code">
$ mkdir build;cd build
$ ../configure --prefix=/home/hiyoko/glibc-2.19/build/bin
$ make <font color="red">--debug</font> -j
$ make install</pre>
        <p>compile</p>
        <pre class="code">
$ g++  -Wall -g -O0   -c malloc_sample.cc -o malloc_sample.o
$ g++  -o malloc_sample malloc_sample.o  -g <font color="red">-static</font>
       -I../glibc-2.19/build/bin/include
       -L../glibc-2.19/build/bin/lib</pre>
      </div>

      <div class='slide'>
        <h2>Todo</h2>
        <ul>
          <li><dt>調べたAPIの例題の作成</dt></li>
          <li><dt>malloc読み終わる</dt></li>
          <li><dt>Cyber Agentインターンシップの告知</dt>
            <dd>2016年度新卒、インターンシップ面接(？)免除</dd></li>
        </ul>
      </div>
      </div>

    </div> <!-- presentation -->
  </body>
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