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<div class="title">Using timers to measure execution time </div> </div>
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<div class="textblock"><p>In this example we are using the Real_Timer class to measure the execution time of a simple program. The Real_Timer class is included in the itmisc library.</p>
<div class="fragment"><pre class="fragment"><span class="preprocessor">#include <<a class="code" href="itbase_8h.html" title="Include file for the IT++ base module.">itpp/itbase.h</a>></span>
<span class="keyword">using namespace </span>itpp;
<span class="comment">//These lines are needed for use of cout and endl</span>
<span class="keyword">using</span> std::cout;
<span class="keyword">using</span> std::endl;
<span class="keywordtype">int</span> main()
{
<span class="comment">//Declare the scalars used:</span>
<span class="keywordtype">long</span> i, <a class="code" href="group__matrix__functions.html#ga8b3dcc61484fce58ee4244d5731e18fa" title="Sum of all elements in the vector.">sum</a>, N;
<span class="comment">//Declare tt as an instance of the timer class:</span>
<a class="code" href="classitpp_1_1Real__Timer.html" title="A real time timer classMeasures real time.">Real_Timer</a> tt;
<span class="comment">//Initiate the variables:</span>
N = 1000000;
sum = 0;
<span class="comment">//Start and reset the timer:</span>
tt.<a class="code" href="classitpp_1_1Timer.html#afeed20347c7ba104cbddb62e76340bc7" title="Resets the timer and starts it.">tic</a>();
<span class="comment">//Do some processing</span>
<span class="keywordflow">for</span> (i = 0; i < N; i++) {
sum += i;
}
<span class="comment">// Print the elapsed time</span>
tt.<a class="code" href="classitpp_1_1Timer.html#adc264ac0276f798f33d229e17c66f8a5" title="Prints the elapsed time since last tic()">toc_print</a>();
<span class="comment">//Print the result of the processing:</span>
cout << <span class="stringliteral">"The sum of all integers from 0 to "</span> << N - 1 << <span class="stringliteral">" equals "</span> << sum << endl;
<span class="comment">//Exit program:</span>
<span class="keywordflow">return</span> 0;
}
</pre></div><p>When you run this program, the output will look something like this:</p>
<div class="fragment"><pre class="fragment">Elapsed time = 0.000797055 seconds
The sum of <a class="code" href="namespaceitpp.html#af8943303111340f2be687512ff112501" title="Returns true if all elements are ones and false otherwise.">all</a> integers from 0 <a class="code" href="group__fixed.html#gab4732503214b5293aef0cbd2ab271c7c">to</a> 999999 equals 1783293664
</pre></div> </div></div>
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