If median performance (50th %) is "everyday performance", what is 95th percentile? "Worst-case" or "outlier" imply less common than reality
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@wycats Normal requests taking 500ms are a "problem". 95s taking 200ms probably not. -
@dhh Right, but 95s taking 2s probably is, even if median is 200ms, and this is common. -
@wycats There's your answer. A problem request is one that takes 2s, whether it happens at the median or the 95th. -
@dhh not totally obvious. Tolerance is different at different occurrences. -
@wycats By that token labeling 95ths "problem" isn't apt either, though. And 2s at the median would be 'catastrophe'. -
@dhh yeah the hard thing is labelling relative occurrences so 95p sounds common but not typical. -
@wycats Doesn't mean you can't sell to people who don't know what a distribution is, just that teaching them is separate from labels. -
@dhh yeah totally. Nudging them away from bell curve, especially since all competitors use mean, is hard but important. - 4 more replies
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