Roaring Bitmap in Cython

A roaring bitmap is an efficient compressed datastructure to store a set of integers. A Roaring bitmap stores a set of 32-bit integers in a series of arrays and bitmaps, whichever takes the least space (which is always 2 ** 16 bits or less).

This datastructure is useful for storing a large number of integers, e.g., for an inverted index used by search engines and databases. In particular, it is possible to quickly compute the intersection of a series of sets, which can be used to implement a query as the conjunction of subqueries.

This implementation is based on the Java and C implementations at https://github.com/lemire/RoaringBitmap and https://github.com/lemire/CRoaring

Additional features of this implementation:

Inverted list representation: blocks that are mostly full are stored compactly as an array of non-members (instead of as an array of members or a fixed-size bitmap).
Collections of immutable roaring bitmaps can be efficiently serialized with mmap in a single file.

Missing features w.r.t. CRoaring:

Run-length encoded blocks
Various AVX2 / SSE optimizations

See also PyRoaringBitmap, a Python wrapper of CRoaring: https://github.com/Ezibenroc/PyRoaringBitMap

License, requirements

The code is licensed under GNU GPL v2, or any later version at your option.

Python 2.7+/3.3+ http://www.python.org (headers required, e.g. python-dev package)
Cython 3.0+ http://www.cython.org

Installation

::: $ pip install roaringbitmap

For Linux and Mac, there are binary wheels. Binary wheels for x86-64 require the POPCNT CPU instruction and raise ImportError on unsupported CPUs. Builds from source use -march=native by default and are optimized for the build machine.

To compile from source:

$ git clone https://github.com/andreasvc/roaringbitmap.git
$ cd roaringbitmap
$ make

For Python 2, build with a Cython version that supports Python 2.7:

$ python2 -m pip install 'Cython>=3,<3.1'
$ make py2

The C sources published on PyPI are generated with the current Cython release and support Python 3 only.

Usage

A RoaringBitmap() can be used as a replacement for a normal (mutable) Python set containing (unsigned) 32-bit integers:

>>> from roaringbitmap import RoaringBitmap
>>> RoaringBitmap(range(10)) & RoaringBitmap(range(5, 15))
RoaringBitmap({5, 6, 7, 8, 9})

ImmutableRoaringBitmap is an immutable variant (analogous to frozenset) which is stored compactly as a contiguous block of memory.

A sequence of immutable RoaringBitmaps can be stored in a single file and accessed efficiently with mmap, without needing to copy or deserialize:

>>> from roaringbitmap import MultiRoaringBitmap
>>> mrb = MultiRoaringBitmap([range(n, n + 5) for n in range(10)], filename='index')

>>> mrb = MultiRoaringBitmap.fromfile('index')
>>> mrb[5]
ImmutableRoaringBitmap({5, 6, 7, 8, 9})

For API documentation cf. http://roaringbitmap.readthedocs.io

Benchmarks

Output of $ make bench:

small sparse set
100 runs with sets of 200 random elements n s.t. 0 <= n < 40000
                    set()  RoaringBitmap()    ratio
init         0.000383         0.000627     0.61
initsort     0.000992         0.000258     3.85
and          0.000499         0.000125     3.98
or           0.000507          8.9e-05      5.7
xor          0.000479         8.14e-05     5.88
sub          0.000335         7.57e-05     4.42
iand         1.18e-05         2.77e-06     4.26
ior          8.39e-06         2.75e-06     3.05
ixor         8.12e-06         2.81e-06     2.89
isub         6.54e-06         2.87e-06     2.28
eq_identity  0.000183         4.78e-06     38.2
eq_equal     0.000169         7.33e-06       23
neq_card     4.62e-06         5.43e-06     0.85
neq_early    1.79e-05         6.21e-06     2.89
neq_late     0.000167         6.64e-06     25.2
jaccard      0.000973         4.99e-05     19.5

medium load factor
100 runs with sets of 59392 random elements n s.t. 0 <= n < 118784
                    set()  RoaringBitmap()    ratio
init            0.451            0.138     3.26
initsort        0.349           0.0995     3.51
and             0.362         0.000271     1336
or              0.482         0.000248     1942
xor              0.46         0.000258     1780
sub             0.381         0.000444      857
iand          0.00421         5.33e-06      790
ior           0.00581         5.49e-06     1058
ixor          0.00243         5.05e-06      481
isub          0.00229         4.88e-06      469
eq_identity     0.123         1.64e-05     7501
eq_equal        0.137         3.75e-05     3643
neq_card     7.49e-06         7.06e-06     1.06
neq_early    8.08e-06         2.22e-05    0.364
neq_late        0.139         5.42e-05     2571
jaccard          0.88         0.000183     4806

dense set / high load factor
100 runs with sets of 39800 random elements n s.t. 0 <= n < 40000
                    set()  RoaringBitmap()    ratio
init            0.206           0.0967     2.13
initsort        0.179           0.0531     3.37
and             0.149         0.000134     1117
or              0.209         0.000112     1862
xor             0.186         0.000112     1653
sub              0.12         0.000109     1092
iand          0.00174         3.75e-06      463
ior          0.000865         3.58e-06      241
ixor          0.00112          3.6e-06      310
isub          0.00102          3.5e-06      292
eq_identity     0.052         5.39e-06     9644
eq_equal       0.0559         1.68e-05     3318
neq_card     7.18e-06         7.53e-06    0.954
neq_early    7.17e-06         7.73e-06    0.928
neq_late       0.0437         1.36e-05     3209
jaccard         0.342         9.84e-05     3472

See https://github.com/Ezibenroc/roaring_analysis/ for a performance comparison of PyRoaringBitmap and this library.

References

http://roaringbitmap.org/
Chambi, S., Lemire, D., Kaser, O., & Godin, R. (2016). Better bitmap performance with Roaring bitmaps. Software: practice and experience, 46(5), pp. 709-719. http://arxiv.org/abs/1402.6407
The idea of using the inverted list representation is based on https://issues.apache.org/jira/browse/LUCENE-5983

Development Status
- 4 - Beta
Intended Audience
- Science/Research
Operating System
- POSIX
Programming Language

Release files for roaringbitmap 0.7.4

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Source distribution (sdist)

Source distribution for roaringbitmap 0.7.4
File	Size	Uploaded
roaringbitmap-0.7.4.tar.gz	338.6 kB	Sep 25, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for roaringbitmap 0.7.4
File	Interpreter	ABI	Platform	Reset
roaringbitmap-0.7.4-cp315-cp315-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl 1.2 MB Sep 25, 2026	CPython 3.15	CPython 3.15	Linux glibc 2.17+ x86-64, Linux glibc 2.28+ x86-64	Details
roaringbitmap-0.7.4-cp315-cp315-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl 1.2 MB Sep 25, 2026	CPython 3.15	CPython 3.15	Linux glibc 2.28+ ARM64, Linux glibc 2.17+ ARM64	Details
roaringbitmap-0.7.4-cp315-cp315-macosx_11_0_arm64.whl 198.5 kB Sep 25, 2026	CPython 3.15	CPython 3.15	macOS 11.0+ ARM64	Details
roaringbitmap-0.7.4-cp315-cp315-macosx_10_15_x86_64.whl 218.1 kB Sep 25, 2026	CPython 3.15	CPython 3.15	macOS 10.15+ x86-64	Details
roaringbitmap-0.7.4-cp314-cp314-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl 1.2 MB Sep 25, 2026	CPython 3.14	CPython 3.14	Linux glibc 2.17+ x86-64, Linux glibc 2.28+ x86-64	Details
roaringbitmap-0.7.4-cp314-cp314-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl 1.2 MB Sep 25, 2026	CPython 3.14	CPython 3.14	Linux glibc 2.17+ ARM64, Linux glibc 2.28+ ARM64	Details
roaringbitmap-0.7.4-cp314-cp314-macosx_11_0_arm64.whl 199.1 kB Sep 25, 2026	CPython 3.14	CPython 3.14	macOS 11.0+ ARM64	Details
roaringbitmap-0.7.4-cp314-cp314-macosx_10_15_x86_64.whl 218.2 kB Sep 25, 2026	CPython 3.14	CPython 3.14	macOS 10.15+ x86-64	Details
roaringbitmap-0.7.4-cp313-cp313-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl 1.2 MB Sep 25, 2026	CPython 3.13	CPython 3.13	Linux glibc 2.17+ x86-64, Linux glibc 2.28+ x86-64	Details
roaringbitmap-0.7.4-cp313-cp313-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl 1.2 MB Sep 25, 2026	CPython 3.13	CPython 3.13	Linux glibc 2.28+ ARM64, Linux glibc 2.17+ ARM64	Details
roaringbitmap-0.7.4-cp313-cp313-macosx_11_0_arm64.whl 197.8 kB Sep 25, 2026	CPython 3.13	CPython 3.13	macOS 11.0+ ARM64	Details
roaringbitmap-0.7.4-cp313-cp313-macosx_10_13_x86_64.whl 217.4 kB Sep 25, 2026	CPython 3.13	CPython 3.13	macOS 10.13+ x86-64	Details
roaringbitmap-0.7.4-cp312-cp312-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl 1.2 MB Sep 25, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.17+ x86-64, Linux glibc 2.28+ x86-64	Details
roaringbitmap-0.7.4-cp312-cp312-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl 1.2 MB Sep 25, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.17+ ARM64, Linux glibc 2.28+ ARM64	Details
roaringbitmap-0.7.4-cp312-cp312-macosx_11_0_arm64.whl 198.3 kB Sep 25, 2026	CPython 3.12	CPython 3.12	macOS 11.0+ ARM64	Details
roaringbitmap-0.7.4-cp312-cp312-macosx_10_13_x86_64.whl 217.7 kB Sep 25, 2026	CPython 3.12	CPython 3.12	macOS 10.13+ x86-64	Details
roaringbitmap-0.7.4-cp311-cp311-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl 1.2 MB Sep 25, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.17+ x86-64, Linux glibc 2.28+ x86-64	Details
roaringbitmap-0.7.4-cp311-cp311-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl 1.2 MB Sep 25, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.17+ ARM64, Linux glibc 2.28+ ARM64	Details
roaringbitmap-0.7.4-cp311-cp311-macosx_11_0_arm64.whl 196.0 kB Sep 25, 2026	CPython 3.11	CPython 3.11	macOS 11.0+ ARM64	Details
roaringbitmap-0.7.4-cp311-cp311-macosx_10_9_x86_64.whl 213.9 kB Sep 25, 2026	CPython 3.11	CPython 3.11	macOS 10.9+ x86-64	Details

Total release size: 14.4 MB

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Publishing platform: GitHub Actions
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Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

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Release files / roaringbitmap-0.7.4-cp314-cp314-macosx_10_15_x86_64.whl

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Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

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Artifact

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Release files / roaringbitmap-0.7.4-cp313-cp313-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl

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Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

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Release files / roaringbitmap-0.7.4-cp313-cp313-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl

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Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

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Release files / roaringbitmap-0.7.4-cp313-cp313-macosx_11_0_arm64.whl

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Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

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Artifact

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Release files / roaringbitmap-0.7.4-cp313-cp313-macosx_10_13_x86_64.whl

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Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

Workflow

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Artifact

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Release files / roaringbitmap-0.7.4-cp312-cp312-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl

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Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

Workflow

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Artifact

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Release files / roaringbitmap-0.7.4-cp312-cp312-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl

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Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

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Release files / roaringbitmap-0.7.4-cp312-cp312-macosx_11_0_arm64.whl

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Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

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Artifact

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Release files / roaringbitmap-0.7.4-cp312-cp312-macosx_10_13_x86_64.whl

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Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

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Publishing logs: github.com/andreasvc/roaringbitmap/actions/runs/36132942023/attempts/1

Artifact

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Release files / roaringbitmap-0.7.4-cp311-cp311-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl

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Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

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Publishing logs: github.com/andreasvc/roaringbitmap/actions/runs/36132942023/attempts/1

Artifact

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Release files / roaringbitmap-0.7.4-cp311-cp311-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl

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Upload date	Sep 25, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

Workflow

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Artifact

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SHA-256 checksum: 2290c0800b39336532bd14b38d78faa65c6a1c03f438f51670eef4fc0d499da4 Verifying attestations

Release files / roaringbitmap-0.7.4-cp311-cp311-macosx_11_0_arm64.whl

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Upload date	Sep 25, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

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Publishing logs: github.com/andreasvc/roaringbitmap/actions/runs/36132942023/attempts/1

Artifact

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Release files / roaringbitmap-0.7.4-cp311-cp311-macosx_10_9_x86_64.whl

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Upload date	Sep 25, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/andreasvc/roaringbitmap
Publishing commit: github.com/andreasvc/roaringbitmap/tree/09220fdc74f7a13df2ded81e95aac23f6242acc5

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Publishing logs: github.com/andreasvc/roaringbitmap/actions/runs/36132942023/attempts/1

Artifact

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