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    <p>Whenever I talk managed vs. unmanaged performance, I like to point to the series Rico (and Raymond) did comparing C++ and C# versions of a Chinese/English dictionary. This <a href="http://www.google.com/search?hl=en&amp;q=performance+quiz+6+site%3Ablogs.msdn.com" rel="noreferrer">google search</a> will let you read for yourself, but I like Rico's summary.</p> <blockquote> <p>So am I ashamed by my crushing defeat? Hardly. The managed code got a very good result for hardly any effort. To defeat the managed Raymond had to:</p> <ul> <li>Write his own file I/O stuff </li> <li>Write his own string class </li> <li>Write his own allocator </li> <li>Write his own international mapping</li> </ul> <p>Of course he used available lower level libraries to do this, but that's still a lot of work. Can you call what's left an STL program? I don't think so, I think he kept the std::vector class which ultimately was never a problem and he kept the find function. Pretty much everything else is gone.</p> <p>So, yup, you can definately beat the CLR. Raymond can make his program go even faster I think.</p> <p>Interestingly, the time to parse the file as reported by both programs internal timers is about the same -- 30ms for each. The difference is in the overhead.</p> </blockquote> <p>For me the bottom line is that it took 6 revisions for the unmanaged version to beat the managed version that was a simple port of the original unmanaged code. If you need every last bit of performance (and have the time and expertise to get it), you'll have to go unmanaged, but for me, I'll take the order of magnitude advantage I have on the first versions over the 33% I gain if I try 6 times.</p>
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    1. COlink is dead, found mentioned article here: http://blogs.msdn.com/b/ricom/archive/2005/05/10/416151.aspx
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    2. COFirst of all, if we look at Raymond Chen's code, he clearly does not understand C++ or data structures very well. His code almost reaches straight for low-level C code even in cases where the C code has no performance benefits (it just seems to be a sort of distrust and maybe a lack of knowledge of how to use profilers). He also failed to understand the most algorithmically sound way of implementing a dictionary (he used std::find for Christ's sake). If there's something good about Java, Python, C#, etc. - they all provide very efficient dictionaries...
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    3. COTries or even std::map would fare much more favorably towards C++ or even a hash table. Finally, a dictionary is exactly the type of program that benefits most from high-level libraries and frameworks. It doesn't demonstrate differences in the language so much as the libraries involved (of which, I would happily say that C# is far more complete and provides much more tools suited for the task). Show a program that manipulates large blocks of memory in comparison, like a large-scale matrix/vector code. That'll settle this quite quickly even if, as in this case, the coders don't know what...
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