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How to calculate the redis memory usage of CountingBloomFilterRedis #58

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techzhou opened this issue Nov 7, 2019 · 1 comment

techzhou commented Nov 7, 2019

For example,

new FilterBuilder(1000000, 1e-5)

when it full （added 1000000 elements）

how much memory it cost. is there any calculation method?

kangwen commented Apr 27, 2021

N (added elements , 1000000 eg.)
f (falseProbability, 1e-5 eg.)
M (total bit)： M = - N * ln(f) / ln2^2.
K(hash functions)： K = max(1, ln2* M/N)

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