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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"><div class="line"><span class="preprocessor">#include <<a class="code" href="itbase_8h.html">itpp/itbase.h</a>></span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="namespaceitpp.html">itpp</a>;</div><div class="line"></div><div class="line"><span class="comment">//These lines are needed for use of cout and endl</span></div><div class="line"><span class="keyword">using</span> std::cout;</div><div class="line"><span class="keyword">using</span> std::endl;</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main()</div><div class="line">{</div><div class="line"> <span class="comment">//Declare the scalars used:</span></div><div class="line"> <span class="keywordtype">long</span> i, <a class="code" href="group__matrix__functions.html#ga8907d7a7df866d4244dbc2679f7e3e58">sum</a>, N;</div><div class="line"></div><div class="line"> <span class="comment">//Declare tt as an instance of the timer class:</span></div><div class="line"> <a class="code" href="classitpp_1_1Real__Timer.html">Real_Timer</a> tt;</div><div class="line"></div><div class="line"> <span class="comment">//Initiate the variables:</span></div><div class="line"> N = 1000000;</div><div class="line"> sum = 0;</div><div class="line"></div><div class="line"> <span class="comment">//Start and reset the timer:</span></div><div class="line"> tt.<a class="code" href="classitpp_1_1Timer.html#afeed20347c7ba104cbddb62e76340bc7">tic</a>();</div><div class="line"></div><div class="line"> <span class="comment">//Do some processing</span></div><div class="line"> <span class="keywordflow">for</span> (i = 0; i < N; i++) {</div><div class="line"> sum += i;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="comment">// Print the elapsed time</span></div><div class="line"> tt.<a class="code" href="classitpp_1_1Timer.html#adc264ac0276f798f33d229e17c66f8a5">toc_print</a>();</div><div class="line"></div><div class="line"> <span class="comment">//Print the result of the processing:</span></div><div class="line"> cout << <span class="stringliteral">"The sum of all integers from 0 to "</span> << N - 1 << <span class="stringliteral">" equals "</span> << sum << endl;</div><div class="line"></div><div class="line"> <span class="comment">//Exit program:</span></div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line"></div><div class="line">}</div></div><!-- fragment --><p>When you run this program, the output will look something like this:</p>
<div class="fragment"><div class="line">Elapsed time = 0.000797055 seconds</div><div class="line">The sum of all integers from 0 to 999999 equals 1783293664</div></div><!-- fragment --> </div></div><!-- contents -->
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