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    Assuming you know your OS doesn't have its own leaks. Commented Dec 29, 2015 at 5:57
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    "waste of CPU time" Though a very, very small amount of time. free is usually much faster than malloc. Commented Dec 29, 2015 at 16:13
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    @PaulDraper Aye, waste of time swapping everything back in is much more significant. Commented Oct 9, 2016 at 18:08