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    <p>The first step would be to figure out how much of the time is spent in the <code>if(lineIn.find(...)...</code> and how much is the actual reading of input file. </p> <p>Time the time your application runs for (you may want to take a selection of log-files, rather than ALL of them). You may want to run this a few times in a row to see that you get the same (approximately) value. </p> <p>The add:</p> <pre><code>#if 0 if (lineIn.find(...) ...) ... #endif </code></pre> <p>and compare the time it takes. My guess is that it won't actually make that much of a difference. However, if the searching is a major component of the time, you may find that it's beneficial to use a more clever search method. There are some pretty clever methods for searching for strings in a larger string. </p> <p>I will post back with a couple of benchmarks of "read a file quicker" that I've posted elsewhere. But bear in mind that the hard-disk that you are reading from will be the major amount of time. </p> <p>References:</p> <p><a href="https://stackoverflow.com/questions/14463244/getline-while-reading-a-file-vs-reading-whole-file-and-then-splitting-based-on-n">getline while reading a file vs reading whole file and then splitting based on newline character</a></p> <p>slightly less relevant, but perhaps interesting:</p> <p><a href="https://stackoverflow.com/questions/15115943/what-is-the-best-efficient-way-to-read-millions-of-integers-separated-by-lines-f">What is the best efficient way to read millions of integers separated by lines from text file in c++</a></p>
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