Acme::CPANModules::BloomFilters - List of bloom filter modules on CPAN


This document describes version 0.004 of Acme::CPANModules::BloomFilters (from Perl distribution Acme-CPANModules-BloomFilters), released on 2022-03-18.


Bloom filter is a data structure that allows you to quickly check whether an element is in a set. Compared to a regular hash, it is much more memory-efficient. The downside is that bloom filter can give you false positives, although false negatives are not possible. So in essence you can ask a bloom filter which item is "possibly in set" or "definitely not in set". You can configure the rate of false positives. The larger the filter, the smaller the rate. Some examples for application of bloom filter include: 1) checking whether a password is in a dictionary of millions of common/compromised passwords; 2) checking an email address against leak database; 3) virus pattern checking; 4) IP/domain blacklisting/whitelisting. Due to its properties, it is sometimes combined with other data structures. For example, a small bloom filter can be distributed with a software to check against a database. When the answer from bloom filter is "possibly in set", the software can further consult on online database to make sure if it is indeed in set. Thus, bloom filter can be used to reduce the number of direct queries to database.

In Perl, my default go-to choice is Algorithm::BloomFilter, unless there's a specific feature I need from other implementations.


  • Bloom::Filter - Sample Perl Bloom filter implementation

    Author: XAERXESS

    Does not provide mehods to save/load to/from strings/files, although you can just take a peek at the source code or the hash object and get the filter there. Performance might not be stellar since it's pure-Perl.

  • Bloom16 - Perl extension for "threshold" Bloom filters

    Author: IWOODHEAD

    An Inline::C module. Barely documented. Also does not provide filter saving/loading methods.

  • Algorithm::BloomFilter - A simple bloom filter data structure

    Author: SMUELLER

    XS, made by SMUELLER. Can merge other bloom filters. Provides serialize and deserialize methods.

  • Bloom::Scalable - Implementation of the probalistic datastructure - ScalableBloomFilter

    Author: SUBBU

    Pure-perl module. A little weird, IMO, e.g. with hardcoded filenames. The distribution also provides Bloom::Simple.

  • Bloom::Simple

    Author: SUBBU

    Pure-perl module. A little weird, IMO, e.g. with hardcoded filenames. The distribution also provides Bloom::Simple.

  • Bloom::Faster - Perl extension for the c library libbloom.

    Author: PALVARO

    XS module. Serialize/deserialize directly to/from files, no string (de)serialization provided.

  • Text::Bloom

    Author: ASPINELLI

    Pure-Perl module, part of Text-Document distribution. Uses Bit::Vector.

  • App::BloomUtils - Utilities related to bloom filters

    Author: PERLANCAR

  • Bencher::Scenarios::BloomFilters


What is an Acme::CPANModules::* module?

An Acme::CPANModules::* module, like this module, contains just a list of module names that share a common characteristics. It is a way to categorize modules and document CPAN. See Acme::CPANModules for more details.

What are ways to use this Acme::CPANModules module?

Aside from reading this Acme::CPANModules module's POD documentation, you can install all the listed modules (entries) using cpanm-cpanmodules script (from App::cpanm::cpanmodules distribution):

 % cpanm-cpanmodules -n BloomFilters

Alternatively you can use the cpanmodules CLI (from App::cpanmodules distribution):

    % cpanmodules ls-entries BloomFilters | cpanm -n

or Acme::CM::Get:

    % perl -MAcme::CM::Get=BloomFilters -E'say $_->{module} for @{ $LIST->{entries} }' | cpanm -n

or directly:

    % perl -MAcme::CPANModules::BloomFilters -E'say $_->{module} for @{ $Acme::CPANModules::BloomFilters::LIST->{entries} }' | cpanm -n

This Acme::CPANModules module also helps lcpan produce a more meaningful result for lcpan related-mods command when it comes to finding related modules for the modules listed in this Acme::CPANModules module. See App::lcpan::Cmd::related_mods for more details on how "related modules" are found.


Please visit the project's homepage at


Source repository is at


Acme::CPANModules - about the Acme::CPANModules namespace

cpanmodules - CLI tool to let you browse/view the lists


perlancar <>


To contribute, you can send patches by email/via RT, or send pull requests on GitHub.

Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:

 % prove -l

If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla plugin and/or Pod::Weaver::Plugin. Any additional steps required beyond that are considered a bug and can be reported to me.


This software is copyright (c) 2022, 2021, 2018 by perlancar <>.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.


Please report any bugs or feature requests on the bugtracker website

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.