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cache.cpp.html
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cache.cpp.html
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<meta name="GENERATOR" content="GNU source-highlight
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite">
<title>cache.cpp</title>
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<pre><b><span style="color:#000080">#include</span></b> <span style="color:#FF0000"><iostream></span>
<b><span style="color:#000080">#include</span></b> <span style="color:#FF0000"><unistd.h></span>
<b><span style="color:#0000FF">using</span></b> <b><span style="color:#0000FF">namespace</span></b> std<span style="color:#990000">;</span>
<span style="color:#009900">int</span> <b><span style="color:#000000">main</span></b> <span style="color:#990000">(</span><span style="color:#009900">void</span><span style="color:#990000">)</span> <span style="color:#FF0000">{</span>
cout <span style="color:#990000"><<</span> <span style="color:#FF0000">"page size: "</span> <span style="color:#990000"><<</span> <b><span style="color:#000000">getpagesize</span></b><span style="color:#990000">()</span> <span style="color:#990000"><<</span> endl<span style="color:#990000">;</span>
<span style="color:#009900">int</span> array<span style="color:#990000">[</span><span style="color:#993399">1024</span><span style="color:#990000">][</span><span style="color:#993399">1024</span><span style="color:#990000">];</span>
<b><span style="color:#0000FF">for</span></b> <span style="color:#990000">(</span> <span style="color:#009900">int</span> i <span style="color:#990000">=</span> <span style="color:#993399">0</span><span style="color:#990000">;</span> i <span style="color:#990000"><</span> <span style="color:#993399">1024</span><span style="color:#990000">;</span> i<span style="color:#990000">++</span> <span style="color:#990000">)</span>
<b><span style="color:#0000FF">for</span></b> <span style="color:#990000">(</span> <span style="color:#009900">int</span> j <span style="color:#990000">=</span> <span style="color:#993399">0</span><span style="color:#990000">;</span> j <span style="color:#990000"><</span> <span style="color:#993399">1024</span><span style="color:#990000">;</span> j<span style="color:#990000">++</span> <span style="color:#990000">)</span>
array<span style="color:#990000">[</span>i<span style="color:#990000">][</span>j<span style="color:#990000">]</span> <span style="color:#990000">=</span> <span style="color:#993399">0</span><span style="color:#990000">;</span>
<b><span style="color:#0000FF">for</span></b> <span style="color:#990000">(</span> <span style="color:#009900">int</span> c <span style="color:#990000">=</span> <span style="color:#993399">0</span><span style="color:#990000">;</span> c <span style="color:#990000"><</span> <span style="color:#993399">1024</span><span style="color:#990000">;</span> c<span style="color:#990000">++</span> <span style="color:#990000">)</span>
<b><span style="color:#0000FF">for</span></b> <span style="color:#990000">(</span> <span style="color:#009900">int</span> i <span style="color:#990000">=</span> <span style="color:#993399">0</span><span style="color:#990000">;</span> i <span style="color:#990000"><</span> <span style="color:#993399">1024</span><span style="color:#990000">;</span> i<span style="color:#990000">++</span> <span style="color:#990000">)</span>
<b><span style="color:#0000FF">for</span></b> <span style="color:#990000">(</span> <span style="color:#009900">int</span> j <span style="color:#990000">=</span> <span style="color:#993399">0</span><span style="color:#990000">;</span> j <span style="color:#990000"><</span> <span style="color:#993399">1024</span><span style="color:#990000">;</span> j<span style="color:#990000">++</span> <span style="color:#990000">)</span>
array<span style="color:#990000">[</span>i<span style="color:#990000">][</span>j<span style="color:#990000">]++;</span>
<span style="color:#009900">int</span> sum <span style="color:#990000">=</span> <span style="color:#993399">0</span><span style="color:#990000">;</span>
<b><span style="color:#0000FF">for</span></b> <span style="color:#990000">(</span> <span style="color:#009900">int</span> i <span style="color:#990000">=</span> <span style="color:#993399">0</span><span style="color:#990000">;</span> i <span style="color:#990000"><</span> <span style="color:#993399">1024</span><span style="color:#990000">;</span> i<span style="color:#990000">++</span> <span style="color:#990000">)</span>
<b><span style="color:#0000FF">for</span></b> <span style="color:#990000">(</span> <span style="color:#009900">int</span> j <span style="color:#990000">=</span> <span style="color:#993399">0</span><span style="color:#990000">;</span> j <span style="color:#990000"><</span> <span style="color:#993399">1024</span><span style="color:#990000">;</span> j<span style="color:#990000">++</span> <span style="color:#990000">)</span>
sum <span style="color:#990000">+=</span> array<span style="color:#990000">[</span>i<span style="color:#990000">][</span>j<span style="color:#990000">];</span>
cout <span style="color:#990000"><<</span> sum <span style="color:#990000"><<</span> endl<span style="color:#990000">;</span>
<b><span style="color:#0000FF">return</span></b> <span style="color:#993399">0</span><span style="color:#990000">;</span>
<span style="color:#FF0000">}</span>
<i><span style="color:#9A1900">// average time for i as outer, j as inner: 2.696 sec</span></i>
<i><span style="color:#9A1900">// average time for j as outer, i as inner: 124.947 sec</span></i>
<i><span style="color:#9A1900">// a factor of 46.345</span></i>
</pre>
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