Takeaways
Let’s review what you just learned about profiling:
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Use ruby-prof for profiling. Get better profile visualization with KCachegrind/QCachegrind.
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Profiling is the only reliable way to understand what is slow in your application. Unfortunately it doesn’t tell you how to optimize.
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Profiling and visualization tools are prone to double counting. You must carefully examine your profile to draw the right conclusions.
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Remember little details that can make your profiles invalid. Turn off GC for CPU profiling.
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