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    <p>I assume what you want to do is find out <em>which lines of code are costing you enough to be worth optimizing</em>. That is very different from timing functions. <a href="https://stackoverflow.com/questions/1777556/alternatives-to-gprof/1779343#1779343">You can do better than <strong>gprof</strong>.</a></p> <p><a href="https://stackoverflow.com/questions/375913/what-can-i-use-to-profile-c-code-in-linux/378024#378024">Here's a fairly complete explanation of how to do it.</a></p> <p>You can do it by hand, or use one of the profilers that can provide the same information, such as <a href="http://oprofile.sourceforge.net/news/" rel="nofollow noreferrer"><em>oprofile</em></a>, and <a href="http://www.rotateright.com/" rel="nofollow noreferrer"><em>RotateRight/Zoom</em></a>.</p> <p>BTW, inlining is of significant value only if the routines being inlined are small and don't call functions themselves, and if the lines where they are being called are active enough of the time to be significant.</p> <p>As for the order of magnitude performance ratio between debug and release build, it may be due to a number of things, maybe or maybe not the inlining. You can use the <a href="https://stackoverflow.com/questions/406760/whats-your-most-controversial-programming-opinion/1562802#1562802">stackshot</a> method mentioned above to find out for certain just what's going on in either case. I've found that debug builds can be slow for other reasons, like recursive data structure validation, for example.</p>
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    1. POProfiling C++ in the presence of aggressive inlining?
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    1. USMike Dunlavey
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    1. CO(+1) nice info, especially the stackshot link (which says the key is capturing and not sampling), although all the tools seem to be measuring rather than capturing -- stackshot too.
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      1. USHassan Syed
    2. CO@Hassan: Yeah. I think of it as a matter of emphasis, on the precision of location, rather than on the precision of measurement. Oprofile and Zoom take stack samples on wall-clock time, and they can give you, per statement, the % of samples containing that statement. If they give it from a lot of samples, that's OK but not really necessary. Personally I do it by hand, because then I can also see more state information such as the data being worked on. Often that is crucial information.
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      1. USMike Dunlavey
    3. COYes I am in agreement, I do this stuff by hand as well -- and consensus in profiling game engines / embedded work / OS routines and RTOS stuff pretty much uses this approach as well.
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