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Performance analysis in Linux (continued)

Last time I wrote about Performance Assessment, I discussed how an apparently naive code snippet can hide major performance drawbacks. In that example, the issue was caused by the randomness of the conditional branch direction, triggered by our unsorted vector, which really confused the Branch Predictor inside the processor. In this post, I will show one more example of how easy it is to disrupt performance of a modern CPU, and also run a quick discussion on why performance matters – as well as present a few cases where it shouldn’t matter.