blosc2

A Python wrapper for the extremely fast Blosc2 compression library

Author:: The Blosc development team
Contact:: blosc@blosc.org
Github:: https://github.com/Blosc/python-blosc2
PyPi:
Gitter:
Code of Conduct:

What it is

Blosc (http://blosc.org) is a high performance compressor optimized for binary data. It has been designed to transmit data to the processor cache faster than the traditional, non-compressed, direct memory fetch approach via a memcpy() OS call.

Blosc works well for compressing numerical arrays that contains data with relatively low entropy, like sparse data, time series, grids with regular-spaced values, etc.

python-blosc2 is a Python package that wraps C-Blosc2, the newest version of the Blosc compressor. Currently python-blosc2 already reproduces the API of python-blosc, so the former can be used as a drop-in replacement for the later. However, there are a few exceptions for the complete compatibility that are listed here: https://github.com/Blosc/python-blosc2/blob/main/RELEASE_NOTES.md#changes-from-python-blosc-to-python-blosc2

In addition, python-blosc2 aims to leverage the new C-Blosc2 API so as to support super-chunks, serialization and all the features introduced in C-Blosc2. This is work in process and will be done incrementally in future releases.

Note: python-blosc2 is meant to be backward compatible with python-blosc data. That means that it can read data generated with python-blosc, but the opposite is not true (i.e. there is no forward compatibility).

Installing

Blosc is now offering Python wheels for the main OS (Win, Mac and Linux) and platforms. You can install binary packages from PyPi using pip:

pip install blosc2

Documentation

The documentation is here:

https://blosc.org/python-blosc2/python-blosc2.html

Also, some examples are available on:

https://github.com/Blosc/python-blosc2/tree/main/examples

Building

python-blosc2 comes with the Blosc sources with it and can be built with:

git clone https://github.com/Blosc/python-blosc2/
cd python-blosc2
git submodule update --init --recursive
python -m pip install -r requirements.txt
python setup.py build_ext --inplace

That’s all. You can proceed with testing section now.

Testing

After compiling, you can quickly check that the package is sane by running the doctests in blosc/test.py:

python -m pip install -r requirements-tests.txt
python -m pytest  (add -v for verbose mode)

Benchmarking

If curious, you may want to run a small benchmark that compares a plain NumPy array copy against compression through different compressors in your Blosc build:

PYTHONPATH=. python bench/pack_compress.py

Just to whet your appetite, here are some speed figures for an Intel box (i9-10940X CPU @ 3.30GHz, 14 cores) running Ubuntu 22.04. In particular, see how performance for pack_array2/unpack_array2 has improved vs the previous version (labeled as pack_array/unpack_array):

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
python-blosc2 version: 0.3.3.dev0
Blosc version: 2.4.2.dev ($Date:: 2022-09-16 #$)
Compressors available: ['blosclz', 'lz4', 'lz4hc', 'zlib', 'zstd']
Compressor library versions:
  BLOSCLZ: 2.5.1
  LZ4: 1.9.4
  LZ4HC: 1.9.4
  ZLIB: 1.2.11.zlib-ng
  ZSTD: 1.5.2
Python version: 3.9.13 | packaged by conda-forge | (main, May 27 2022, 16:56:21)
[GCC 10.3.0]
Platform: Linux-5.15.0-41-generic-x86_64 (#44-Ubuntu SMP Wed Jun 22 14:20:53 UTC 2022)
Linux dist: Ubuntu 22.04 LTS
Processor: x86_64
Byte-ordering: little
Detected cores: 14.0
Number of threads to use by default: 8
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Creating NumPy arrays with 10**8 int64/float64 elements:
  Time for copying array with np.copy:                  0.394 s (3.79 GB/s))


*** the arange linear distribution ***
Using *** Codec.BLOSCLZ *** compressor:
  Time for compress/decompress:         0.051/0.101 s (29.08/14.80 GB/s))   cr: 444.3x
  Time for pack_array/unpack_array:     0.600/0.764 s (2.49/1.95 GB/s))     cr: 442.3x
  Time for pack_array2/unpack_array2:   0.059/0.158 s (25.28/9.44 GB/s))    cr: 444.2x
Using *** Codec.LZ4 *** compressor:
  Time for compress/decompress:         0.059/0.116 s (25.07/12.82 GB/s))   cr: 279.2x
  Time for pack_array/unpack_array:     0.615/0.758 s (2.42/1.97 GB/s))     cr: 277.9x
  Time for pack_array2/unpack_array2:   0.058/0.160 s (25.52/9.31 GB/s))    cr: 279.2x
Using *** Codec.LZ4HC *** compressor:
  Time for compress/decompress:         0.193/0.085 s (7.71/17.45 GB/s))    cr: 155.9x
  Time for pack_array/unpack_array:     0.786/0.754 s (1.89/1.98 GB/s))     cr: 155.4x
  Time for pack_array2/unpack_array2:   0.218/0.165 s (6.84/9.02 GB/s))     cr: 155.9x
Using *** Codec.ZLIB *** compressor:
  Time for compress/decompress:         0.250/0.141 s (5.96/10.55 GB/s))    cr: 273.8x
  Time for pack_array/unpack_array:     0.799/0.845 s (1.87/1.76 GB/s))     cr: 273.2x
  Time for pack_array2/unpack_array2:   0.261/0.243 s (5.71/6.13 GB/s))     cr: 273.8x
Using *** Codec.ZSTD *** compressor:
  Time for compress/decompress:         0.189/0.079 s (7.89/18.92 GB/s))    cr: 644.9x
  Time for pack_array/unpack_array:     0.725/0.770 s (2.06/1.94 GB/s))     cr: 630.9x
  Time for pack_array2/unpack_array2:   0.206/0.143 s (7.25/10.39 GB/s))    cr: 644.8x

*** the linspace linear distribution ***
Using *** Codec.BLOSCLZ *** compressor:
  Time for compress/decompress:         0.091/0.113 s (16.34/13.21 GB/s))   cr:  50.1x
  Time for pack_array/unpack_array:     0.623/0.751 s (2.39/1.98 GB/s))     cr:  50.0x
  Time for pack_array2/unpack_array2:   0.124/0.163 s (11.98/9.12 GB/s))    cr:  50.1x
Using *** Codec.LZ4 *** compressor:
  Time for compress/decompress:         0.077/0.114 s (19.33/13.12 GB/s))   cr:  55.7x
  Time for pack_array/unpack_array:     0.624/0.740 s (2.39/2.01 GB/s))     cr:  55.8x
  Time for pack_array2/unpack_array2:   0.098/0.190 s (15.19/7.83 GB/s))    cr:  55.7x
Using *** Codec.LZ4HC *** compressor:
  Time for compress/decompress:         0.352/0.075 s (4.23/19.98 GB/s))    cr:  53.6x
  Time for pack_array/unpack_array:     0.918/0.781 s (1.62/1.91 GB/s))     cr:  53.6x
  Time for pack_array2/unpack_array2:   0.389/0.139 s (3.83/10.72 GB/s))    cr:  53.6x
Using *** Codec.ZLIB *** compressor:
  Time for compress/decompress:         0.395/0.148 s (3.77/10.08 GB/s))    cr:  50.4x
  Time for pack_array/unpack_array:     0.940/0.824 s (1.59/1.81 GB/s))     cr:  50.4x
  Time for pack_array2/unpack_array2:   0.433/0.252 s (3.44/5.92 GB/s))     cr:  50.4x
Using *** Codec.ZSTD *** compressor:
  Time for compress/decompress:         0.402/0.098 s (3.71/15.22 GB/s))    cr:  74.7x
  Time for pack_array/unpack_array:     0.949/0.782 s (1.57/1.91 GB/s))     cr:  74.7x
  Time for pack_array2/unpack_array2:   0.426/0.175 s (3.50/8.49 GB/s))     cr:  74.7x

*** the random distribution ***
Using *** Codec.BLOSCLZ *** compressor:
  Time for compress/decompress:         0.240/0.119 s (6.22/12.48 GB/s))    cr:   4.0x
  Time for pack_array/unpack_array:     0.794/0.767 s (1.88/1.94 GB/s))     cr:   4.0x
  Time for pack_array2/unpack_array2:   0.578/0.162 s (2.58/9.20 GB/s))     cr:   4.0x
Using *** Codec.LZ4 *** compressor:
  Time for compress/decompress:         0.250/0.114 s (5.97/13.11 GB/s))    cr:   4.0x
  Time for pack_array/unpack_array:     0.794/0.767 s (1.88/1.94 GB/s))     cr:   4.0x
  Time for pack_array2/unpack_array2:   0.590/0.161 s (2.53/9.24 GB/s))     cr:   4.0x
Using *** Codec.LZ4HC *** compressor:
  Time for compress/decompress:         1.102/0.088 s (1.35/17.01 GB/s))    cr:   4.0x
  Time for pack_array/unpack_array:     1.690/0.758 s (0.88/1.97 GB/s))     cr:   4.0x
  Time for pack_array2/unpack_array2:   1.445/0.178 s (1.03/8.38 GB/s))     cr:   4.0x
Using *** Codec.ZLIB *** compressor:
  Time for compress/decompress:         1.258/0.210 s (1.18/7.11 GB/s))     cr:   4.7x
  Time for pack_array/unpack_array:     1.822/0.898 s (0.82/1.66 GB/s))     cr:   4.7x
  Time for pack_array2/unpack_array2:   1.549/0.355 s (0.96/4.20 GB/s))     cr:   4.7x
Using *** Codec.ZSTD *** compressor:
  Time for compress/decompress:         1.653/0.098 s (0.90/15.21 GB/s))    cr:   4.4x
  Time for pack_array/unpack_array:     2.206/0.796 s (0.68/1.87 GB/s))     cr:   4.4x
  Time for pack_array2/unpack_array2:   2.077/0.179 s (0.72/8.30 GB/s))     cr:   4.4x

As can be seen, is perfectly possible for python-blosc2 to go faster than a plain memcpy(). But more interestingly, you can easily choose the codecs and filters that better adapt to your datasets, and persist and transmit them faster and using less memory.

Start using compression in your data workflows and feel the experience of doing more with less.

License

The software is licenses under a 3-Clause BSD license. A copy of the python-blosc2 license can be found in LICENSE. A copy of all licenses can be found in LICENSES/.

Mailing list

Discussion about this module is welcome in the Blosc list:

blosc@googlegroups.com

http://groups.google.es/group/blosc

Twitter

Please follow @Blosc2 to get informed about the latest developments.

Enjoy data!

Metadata

Release files for blosc2 0.4.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for blosc2 0.4.0
File	Size	Uploaded
blosc2-0.4.0.tar.gz	2.5 MB	Oct 1, 2022	Details

Built distributions (wheels)

Table of built distributions (wheels) for blosc2 0.4.0
File	Interpreter	ABI	Platform	Reset
blosc2-0.4.0-cp310-cp310-win_amd64.whl 1.9 MB Oct 1, 2022	CPython 3.10	CPython 3.10	Windows x86-64	Details
blosc2-0.4.0-cp310-cp310-musllinux_1_1_x86_64.whl 4.0 MB Oct 1, 2022	CPython 3.10	CPython 3.10	Linux musl 1.1+ x86-64	Details
blosc2-0.4.0-cp310-cp310-musllinux_1_1_i686.whl 4.0 MB Oct 1, 2022	CPython 3.10	CPython 3.10	Linux musl 1.1+ x86-32	Details
blosc2-0.4.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 3.9 MB Oct 1, 2022	CPython 3.10	CPython 3.10	Linux glibc 2.17+ x86-64	Details
blosc2-0.4.0-cp310-cp310-macosx_10_9_x86_64.whl 3.9 MB Oct 1, 2022	CPython 3.10	CPython 3.10	macOS 10.9+ x86-64	Details
blosc2-0.4.0-cp39-cp39-win_amd64.whl 1.9 MB Oct 1, 2022	CPython 3.9	CPython 3.9	Windows x86-64	Details
blosc2-0.4.0-cp39-cp39-musllinux_1_1_x86_64.whl 4.0 MB Oct 1, 2022	CPython 3.9	CPython 3.9	Linux musl 1.1+ x86-64	Details
blosc2-0.4.0-cp39-cp39-musllinux_1_1_i686.whl 4.0 MB Oct 1, 2022	CPython 3.9	CPython 3.9	Linux musl 1.1+ x86-32	Details
blosc2-0.4.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 3.9 MB Oct 1, 2022	CPython 3.9	CPython 3.9	Linux glibc 2.17+ x86-64	Details
blosc2-0.4.0-cp39-cp39-macosx_10_9_x86_64.whl 3.9 MB Oct 1, 2022	CPython 3.9	CPython 3.9	macOS 10.9+ x86-64	Details
blosc2-0.4.0-cp38-cp38-win_amd64.whl 1.9 MB Oct 1, 2022	CPython 3.8	CPython 3.8	Windows x86-64	Details
blosc2-0.4.0-cp38-cp38-musllinux_1_1_x86_64.whl 4.0 MB Oct 1, 2022	CPython 3.8	CPython 3.8	Linux musl 1.1+ x86-64	Details
blosc2-0.4.0-cp38-cp38-musllinux_1_1_i686.whl 4.0 MB Oct 1, 2022	CPython 3.8	CPython 3.8	Linux musl 1.1+ x86-32	Details
blosc2-0.4.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 3.9 MB Oct 1, 2022	CPython 3.8	CPython 3.8	Linux glibc 2.17+ x86-64	Details
blosc2-0.4.0-cp38-cp38-macosx_10_9_x86_64.whl 3.9 MB Oct 1, 2022	CPython 3.8	CPython 3.8	macOS 10.9+ x86-64	Details

Total release size: 55.7 MB

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Uploaded via	`twine/4.0.1 CPython/3.9.14`

Release files / blosc2-0.4.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

Download URL	blosc2-0.4.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Size	3.9 MB
Tags	CPython 3.8 Linux glibc 2.17+ x86-64
SHA-256 checksum How to use checksums	`c888e156c79dd995ba1c6bb6832fb66557c50d94d89f0d7d41fb004af0dbd3ec`
BLAKE2b-256 checksum How to use checksums	`03cee030739672a02add97b9ea43861c34d261a47f92ffd1f7bc3fba161a2c86`
Upload date	Oct 1, 2022
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/4.0.1 CPython/3.9.14`

Release files / blosc2-0.4.0-cp38-cp38-macosx_10_9_x86_64.whl

Download URL	blosc2-0.4.0-cp38-cp38-macosx_10_9_x86_64.whl
Size	3.9 MB
Tags	CPython 3.8 macOS 10.9+ x86-64
SHA-256 checksum How to use checksums	`95cf09a73c0ee8c3696659e71361d9e6816b8d80e258534f3184cab96644e040`
BLAKE2b-256 checksum How to use checksums	`9799a540d1fc672c55124767171f58553cd60531257b5f4d1e0510a0f363f96c`
Upload date	Oct 1, 2022
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/4.0.1 CPython/3.9.14`