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Back-of-the-envelope Estimation

Sumit Rawal answered on May 20, 2023 Popularity 6/10 Helpfulness 2/10

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  • Back-of-the-envelope Estimation

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    In a system design interview, sometimes you are asked to estimate system capacity or performance requirements using a back-of-the-envelope estimation. According to Jeff Dean, Google Senior Fellow, “back-of-the-envelope calculations are estimates you create using a combination of thought experiments and common performance numbers to get a good feel for which designs will meet your requirements” [1].

    You need to have a good sense of scalability basics to effectively carry out back-of-the-envelope estimation. The following concepts should be well understood: power of two [2], latency numbers every programmer should know, and availability numbers. 

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    Contributed on May 20 2023
    Sumit Rawal
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