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author Shohei KOKUBO <e105744@ie.u-ryukyu.ac.jp>
date Tue, 05 Nov 2013 23:18:04 +0900
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1 \section{Cerium での Task の生成}\label{section:cerium}
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2 Cerium では，user が createtask を行い、input data や依存関係の設定を行うと TaskManager で Task が生成される。
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3
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4 \begin{figure}[ht]
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5 \begin{center}
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6 \includegraphics[scale=0.4]{./images/createTask.pdf}
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7 \end{center}
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8 \caption{Task Manager}
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9 \label{fig:createTask}
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10 \end{figure}
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11 図\ref{fig:createTask}は Cerium が Task を作成/実行する場合のクラスの構成となる。
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12 Task 毎に依存関係を表す wait\_i と wait\_me というリストがあり、依存関係が解消されて実行可能になった
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13 Task は ActiveTaskList に移される。さらに、Scheduler に転送しやすい TaskList に変換してから各 Scheduler に
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14 転送される。
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15 \subsection{Taskの生成}
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16 以下に Task を生成する例題を示す。
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17 input data を二つ用意し、 input 同士を乗算し、 output に格納する multiply という例題となる。
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18 \begin{Verbatim}[fontsize=\footnotesize,xleftmargin=1cm]
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19 void
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20 multiply_init
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21 (HTaskPtr twice, int *i_data, int *o_data) {
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22 multiply =
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23 manager->create_task(MULTIPLY_TASK);
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24 // MULTIPLY_TASK is task id(enum)
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25 multiply->set_inData(0, i_data1,
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26 sizeof(int)*length);
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27 multiply->set_inData(1, i_data2,
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28 sizeof(int)*length);
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29 multiply->set_outData(0, o_data,
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30 sizeof(int)*length);
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31 multiply->set_param(0, (memaddr)length);
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32 multiply->set_cpu(SPE_ANY);
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33 multiply->spawn();
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34 }
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35 \end{Verbatim}
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36
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37 \begin{tiny}
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38 \begin{table}[ht]
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39 \begin{center}
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40 \caption{ Task 生成における API }
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41 \label{table:create_taskAPI}
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42 \scalebox{0.5}[0.9]
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43 \small
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44 \begin{tabular}[t]{c|l}
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45 \hline
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46 create\_task& Task を生成する \\
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47 \hline
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48 set\_inData & Task への入力データのアドレスを追加 \\
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49 \hline
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50 set\_outData & Task への入力データのアドレスを追加 \\
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51 \hline
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52 set\_param & Task へ値を一つ渡す。ここでは length \\
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53 \hline
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54 set\_cpu & Task を実行するデバイスの設定 \\
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55 \hline
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56 spawn& 生成した Task を ActiveTaskList に登録 \\
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57 \hline
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58 \end{tabular}
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59 \end{center}
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60 \end{table}
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61 \end{tiny}
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62 Task ( OpenCL における kernel )の記述は以下のようになる。
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63 \begin{Verbatim}[fontsize=\footnotesize,xleftmargin=1cm]
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64 static int
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65 run(SchedTask *s,void *rbuf, void *wbuf)
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66 {
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67 float i_data1=(float*)s->get_input(rbuf,0);
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68 float i_data2=(float*)s->get_input(rbuf,1);
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69 float o_data=(float*)s->get_output(wbuf,0);
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70 long length=(long)s->get_param(0);
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71 for (int i=0;i<length;i++) {
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72 outdata[i]=indata1[i]*indata2[i];
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73 }
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74 return 0;
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75 }
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76 \end{Verbatim}
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77 \begin{tiny}
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78 \begin{table}[ht]
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79 \begin{center}
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80 \caption{ Task 側で使用する API }
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81 \label{table:taskAPI}
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82 \small
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83 \begin{tabular}[t]{c|l}
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84 \hline
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85 get\_input & Schedulerからinput dataを取得 \\
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86 \hline
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87 get\_output & Schedulerからoutput dataを取得 \\
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88 \hline
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89 get\_param & set\_paramした値を取得 \\
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90 \hline
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91 \end{tabular}
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92 \end{center}
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93 \end{table}
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94 \end{tiny}