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  90 <span id="id1"></span><h1>性能改善に関する情報<a class="headerlink" href="#index-0" title="このヘッドラインへのパーマリンク">¶</a></h1>
  91 <p>Ring の性能改善方法を学びます。</p>
  92 <div class="section" id="index-1">
  93 <span id="id2"></span><h2>リストの作成<a class="headerlink" href="#index-1" title="このヘッドラインへのパーマリンク">¶</a></h2>
  94 <p>用例:</p>
  95 <div class="highlight-ring"><div class="highlight"><pre><span class="o">?</span> <span class="s">&quot;Create the list using the Range operator&quot;</span>
  96 <span class="n">t1</span> <span class="o">=</span> <span class="n">clock</span><span class="p">()</span>
  97 <span class="n">aList</span> <span class="o">=</span> <span class="mi">1</span><span class="p">:</span><span class="mi">1000000</span>
  98 <span class="o">?</span> <span class="s">&quot;Time : &quot;</span> <span class="o">+</span> <span class="p">((</span><span class="n">clock</span><span class="p">()</span><span class="o">-</span><span class="n">t1</span><span class="p">)</span><span class="o">/</span><span class="n">clockspersecond</span><span class="p">())</span> <span class="o">+</span> <span class="s">&quot; seconds&quot;</span>
  99
 100 <span class="o">?</span> <span class="s">&quot;Create the list using the For loop&quot;</span>
 101 <span class="n">t1</span> <span class="o">=</span> <span class="n">clock</span><span class="p">()</span>
 102 <span class="n">aList</span> <span class="o">=</span> <span class="o">[]</span>
 103 <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="mi">1000000</span>
 104         <span class="n">aList</span> <span class="o">+</span> <span class="n">x</span>
 105 <span class="k">next</span>
 106 <span class="o">?</span> <span class="s">&quot;Time : &quot;</span> <span class="o">+</span> <span class="p">((</span><span class="n">clock</span><span class="p">()</span><span class="o">-</span><span class="n">t1</span><span class="p">)</span><span class="o">/</span><span class="n">clockspersecond</span><span class="p">())</span> <span class="o">+</span> <span class="s">&quot; seconds&quot;</span>
 107
 108 <span class="o">?</span> <span class="s">&quot;Create the list using the list() function and the For loop&quot;</span>
 109 <span class="n">t1</span> <span class="o">=</span> <span class="n">clock</span><span class="p">()</span>
 110 <span class="n">aList</span> <span class="o">=</span> <span class="kt">list</span><span class="p">(</span><span class="mi">1000000</span><span class="p">)</span>
 111 <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="mi">1000000</span>
 112         <span class="n">aList</span><span class="o">[</span><span class="n">x</span><span class="o">]</span> <span class="o">=</span> <span class="n">x</span>
 113 <span class="k">next</span>
 114 <span class="o">?</span> <span class="s">&quot;Time : &quot;</span> <span class="o">+</span> <span class="p">((</span><span class="n">clock</span><span class="p">()</span><span class="o">-</span><span class="n">t1</span><span class="p">)</span><span class="o">/</span><span class="n">clockspersecond</span><span class="p">())</span> <span class="o">+</span> <span class="s">&quot; seconds&quot;</span>
 115 </pre></div>
 116 </div>
 117 <p>実行結果:</p>
 118 <div class="highlight-none"><div class="highlight"><pre>Create the list using the Range operator
 119 Time : 0.48 seconds
 120 Create the list using the For loop
 121 Time : 0.79 seconds
 122 Create the list using the list() function and the For loop
 123 Time : 1.56 seconds
 124 </pre></div>
 125 </div>
 126 <div class="admonition note">
 127 <p class="first admonition-title">注釈</p>
 128 <p class="last">リストの作成で for ループ、または list() 関数を使用するよりも、範囲演算子のほうが速いです。</p>
 129 </div>
 130 <div class="admonition note">
 131 <p class="first admonition-title">注釈</p>
 132 <p class="last">リストの追加で add() 関数を使用するよりも、連結演算子‘+’を使用したほうが関数呼び出しのオーバーヘッドが少ないため速いです。ただしソースコードの可読性は落ちる場合があります。</p>
 133 </div>
 134 <div class="admonition note">
 135 <p class="first admonition-title">注釈</p>
 136 <p class="last">処理に時間が掛かり過ぎるため copy() 関数で数十万件を超える大量のテストデータを作成しないでください。</p>
 137 </div>
 138 </div>
 139 <div class="section" id="index-2">
 140 <span id="id3"></span><h2>算術演算子<a class="headerlink" href="#index-2" title="このヘッドラインへのパーマリンク">¶</a></h2>
 141 <p>用例:</p>
 142 <div class="highlight-ring"><div class="highlight"><pre><span class="o">?</span> <span class="s">&quot;Using * operator&quot;</span>
 143 <span class="n">t1</span> <span class="o">=</span> <span class="n">clock</span><span class="p">()</span>
 144 <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="mi">1000000</span>
 145         <span class="n">out</span> <span class="o">=</span> <span class="n">x</span> <span class="o">*</span> <span class="mi">2</span>
 146 <span class="k">next</span>
 147 <span class="o">?</span> <span class="s">&quot;Time : &quot;</span> <span class="o">+</span> <span class="p">((</span><span class="n">clock</span><span class="p">()</span><span class="o">-</span><span class="n">t1</span><span class="p">)</span><span class="o">/</span><span class="n">clockspersecond</span><span class="p">())</span> <span class="o">+</span> <span class="s">&quot; seconds&quot;</span>
 148
 149 <span class="o">?</span> <span class="s">&quot;Using *= operator&quot;</span>
 150 <span class="n">t1</span> <span class="o">=</span> <span class="n">clock</span><span class="p">()</span>
 151 <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="mi">1000000</span>
 152         <span class="n">out</span> <span class="o">=</span> <span class="n">x</span>
 153         <span class="n">out</span> <span class="o">*=</span> <span class="mi">2</span>
 154 <span class="k">next</span>
 155 <span class="o">?</span> <span class="s">&quot;Time : &quot;</span> <span class="o">+</span> <span class="p">((</span><span class="n">clock</span><span class="p">()</span><span class="o">-</span><span class="n">t1</span><span class="p">)</span><span class="o">/</span><span class="n">clockspersecond</span><span class="p">())</span> <span class="o">+</span> <span class="s">&quot; seconds&quot;</span>
 156 </pre></div>
 157 </div>
 158 <p>実行結果:</p>
 159 <div class="highlight-none"><div class="highlight"><pre>Using * operator
 160 Time : 1.34 seconds
 161 Using *= operator
 162 Time : 0.47 seconds
 163 </pre></div>
 164 </div>
 165 <div class="admonition note">
 166 <p class="first admonition-title">注釈</p>
 167 <p class="last">* 演算子よりも *= 演算子を使用したほうが速いです。</p>
 168 </div>
 169 </div>
 170 <div class="section" id="len-for">
 171 <span id="index-3"></span><h2>len() と For ループの使用<a class="headerlink" href="#len-for" title="このヘッドラインへのパーマリンク">¶</a></h2>
 172 <p>用例:</p>
 173 <div class="highlight-ring"><div class="highlight"><pre><span class="n">aList</span> <span class="o">=</span> <span class="mi">1</span><span class="p">:</span><span class="mi">1000000</span>
 174
 175 <span class="o">?</span> <span class="s">&quot;Using len() in the For loop&quot;</span>
 176 <span class="n">t1</span> <span class="o">=</span> <span class="n">clock</span><span class="p">()</span>
 177 <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="n">len</span><span class="p">(</span><span class="n">aList</span><span class="p">)</span>
 178 <span class="k">next</span>
 179 <span class="o">?</span> <span class="s">&quot;Time : &quot;</span> <span class="o">+</span> <span class="p">((</span><span class="n">clock</span><span class="p">()</span><span class="o">-</span><span class="n">t1</span><span class="p">)</span><span class="o">/</span><span class="n">clockspersecond</span><span class="p">())</span> <span class="o">+</span> <span class="s">&quot; seconds&quot;</span>
 180
 181 <span class="o">?</span> <span class="s">&quot;Using len() before the For loop&quot;</span>
 182 <span class="n">t1</span> <span class="o">=</span> <span class="n">clock</span><span class="p">()</span>
 183 <span class="n">nMax</span> <span class="o">=</span> <span class="n">len</span><span class="p">(</span><span class="n">aList</span><span class="p">)</span>
 184 <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="n">nMax</span>
 185 <span class="k">next</span>
 186 <span class="o">?</span> <span class="s">&quot;Time : &quot;</span> <span class="o">+</span> <span class="p">((</span><span class="n">clock</span><span class="p">()</span><span class="o">-</span><span class="n">t1</span><span class="p">)</span><span class="o">/</span><span class="n">clockspersecond</span><span class="p">())</span> <span class="o">+</span> <span class="s">&quot; seconds&quot;</span>
 187 </pre></div>
 188 </div>
 189 <p>実行結果:</p>
 190 <div class="highlight-none"><div class="highlight"><pre>Using len() in the For loop
 191 Time : 5.50 seconds
 192 Using len() before the For loop
 193 Time : 0.24 seconds
 194 </pre></div>
 195 </div>
 196 <div class="admonition note">
 197 <p class="first admonition-title">注釈</p>
 198 <p class="last">Len() 関数は For ループ内ではなく For ループの手前で使用したほうが早いです。</p>
 199 </div>
 200 </div>
 201 <div class="section" id="index-4">
 202 <span id="id4"></span><h2>関数とメソッドの呼び出し<a class="headerlink" href="#index-4" title="このヘッドラインへのパーマリンク">¶</a></h2>
 203 <p>用例:</p>
 204 <div class="highlight-ring"><div class="highlight"><pre><span class="o">?</span> <span class="s">&quot;calling 100000 functions&quot;</span>
 205 <span class="n">t1</span> <span class="o">=</span> <span class="n">clock</span><span class="p">()</span>
 206 <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="mi">100000</span>
 207         <span class="n">test</span><span class="p">()</span>
 208 <span class="k">next</span>
 209 <span class="o">?</span> <span class="s">&quot;Time : &quot;</span> <span class="o">+</span> <span class="p">((</span><span class="n">clock</span><span class="p">()</span><span class="o">-</span><span class="n">t1</span><span class="p">)</span><span class="o">/</span><span class="n">clockspersecond</span><span class="p">())</span> <span class="o">+</span> <span class="s">&quot; seconds&quot;</span>
 210
 211 <span class="n">o1</span> <span class="o">=</span> <span class="k">new</span> <span class="n">test</span>
 212
 213 <span class="o">?</span> <span class="s">&quot;calling 100000 methods using the dot operator&quot;</span>
 214 <span class="n">t1</span> <span class="o">=</span> <span class="n">clock</span><span class="p">()</span>
 215 <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="mi">100000</span>
 216         <span class="n">o1</span><span class="p">.</span><span class="n">test</span><span class="p">()</span>
 217 <span class="k">next</span>
 218 <span class="o">?</span> <span class="s">&quot;Time : &quot;</span> <span class="o">+</span> <span class="p">((</span><span class="n">clock</span><span class="p">()</span><span class="o">-</span><span class="n">t1</span><span class="p">)</span><span class="o">/</span><span class="n">clockspersecond</span><span class="p">())</span> <span class="o">+</span> <span class="s">&quot; seconds&quot;</span>
 219
 220 <span class="o">?</span> <span class="s">&quot;calling 100000 methods using braces &quot;</span>
 221 <span class="n">t1</span> <span class="o">=</span> <span class="n">clock</span><span class="p">()</span>
 222 <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="mi">100000</span>
 223         <span class="n">o1</span> <span class="p">{</span> <span class="n">test</span><span class="p">()</span> <span class="p">}</span>
 224 <span class="k">next</span>
 225 <span class="o">?</span> <span class="s">&quot;Time : &quot;</span> <span class="o">+</span> <span class="p">((</span><span class="n">clock</span><span class="p">()</span><span class="o">-</span><span class="n">t1</span><span class="p">)</span><span class="o">/</span><span class="n">clockspersecond</span><span class="p">())</span> <span class="o">+</span> <span class="s">&quot; seconds&quot;</span>
 226
 227
 228 <span class="k">func</span> <span class="n">test</span>
 229
 230 <span class="k">class</span> <span class="n">test</span>
 231         <span class="k">func</span> <span class="n">test</span>
 232 </pre></div>
 233 </div>
 234 <p>実行結果:</p>
 235 <div class="highlight-none"><div class="highlight"><pre>calling 100000 functions
 236 Time : 0.28 seconds
 237 calling 100000 methods using the dot operator
 238 Time : 0.36 seconds
 239 calling 100000 methods using braces
 240 Time : 1.19 seconds
 241 </pre></div>
 242 </div>
 243 <div class="admonition note">
 244 <p class="first admonition-title">注釈</p>
 245 <p class="last">メソッドの呼び出しよりも、関数の呼び出しのほうが僅かに速いです。</p>
 246 </div>
 247 <div class="admonition note">
 248 <p class="first admonition-title">注釈</p>
 249 <p class="last">メソッドの呼び出しで弓括弧を使用するよりも、ドット演算子を使用したほうが速いです。</p>
 250 </div>
 251 </div>
 252 </div>
 253
 254
 255           </div>
 256         </div>
 257       </div>
 258       <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
 259         <div class="sphinxsidebarwrapper"><h3>ページの内容</h3>
 260 <ul>
 261 <li><a class="reference internal" href="#">性能改善に関する情報</a><ul>
 262 <li><a class="reference internal" href="#index-1">リストの作成</a></li>
 263 <li><a class="reference internal" href="#index-2">算術演算子</a></li>
 264 <li><a class="reference internal" href="#len-for">len() と For ループの使用</a></li>
 265 <li><a class="reference internal" href="#index-4">関数とメソッドの呼び出し</a></li>
 266 </ul>
 267 </li>
 268 </ul>
 269
 270
 271   <h4>前のトピックへ</h4>
 272   <p class="topless"><a href="compiler.html"
 273                         title="前の章へ">コマンドラインオプション</a></p>
 274   <h4>次のトピックへ</h4>
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