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📅 Original date posted:2018-05-30
📝 Original message:Hi Jim,
Yes please, could you share CSV? We are developing a Wallet that uses
Golomb-Rice filters it would help a lot for determine the best P value
depending on the estimated number of elements the client needs to watch.
2018-05-29 19:38 GMT-03:00 Jim Posen via bitcoin-dev <
bitcoin-dev at lists.linuxfoundation.org>:
> This is a really cool finding, thanks Pieter!
>
> I did some more analysis on selecting a good P value to reduce total data
> downloaded considering both filters themselves and blocks in the case of
> false positive matches, using data from mainnet. The quantity it minimizes
> is:
>
> filter_size(N, B) + block_size * false_positive_probability(C, N, B)
>
> N is the number of filter elements per block
> B is the Golomb-Rice coding parameter
> C is the number of filter elements watched by the client
>
> The main result is that:
>
> For C = 10, B = 13 is optimal
> For C = 100, B = 16 is optimal
> For C = 1,000, B = 20 is optimal
> For C = 10,000, B = 23 is optimal
>
> So any value of B in the range 16 to 20 seems reasonable, with M = 1.4971
> * 2^B for optimal compression, as Pieter derived. The selection of the
> parameter depends on the target number of elements that a client may watch.
>
> I attached some of the results, and would be happy to share the CSV and
> raw notebook if people are interested.
>
>
> On Fri, May 25, 2018 at 2:14 PM Gregory Maxwell via bitcoin-dev <
> bitcoin-dev at lists.linuxfoundation.org> wrote:
>
>> On Fri, May 25, 2018 at 6:42 PM, Gregory Maxwell <greg at xiph.org> wrote:
>> > configuration is roughly right, then M=1569861 and rice parameter 19
>> > should be used.
>>
>> That should have been M=784931 B=19 ... paste error.
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>>
>
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>
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