Facebook compression algorithm

How does a compression algorithm work?
Compression algorithms reduce the number of bytes required to represent data and the amount of memory required to store images.
Compression allows a larger number of images to be stored on a given medium and increases the amount of data that can be sent over the internet..
How does the zstd algorithm work?
Zstandard combines a dictionary-matching stage (LZ77) with a large search window and a fast entropy-coding stage.
It uses both Huffman coding (used for entries in the Literals section) and finite-state entropy (FSE) - a fast tabled version of ANS, tANS, used for entries in the Sequences section..
What image compression does Facebook use?
Here is the link facebook/zstd .
There are other compression mechanisms are also present viz zlib, gzip, Zip etc.
According to FB, zstd is providing much better performance compared to zlib which is used traditionally._{Mar 20, 2015}.
What is the new compression algorithm for Facebook?
Zstandard is a fast compression algorithm, providing high compression ratios.
It also offers a special mode for small data, called dictionary compression.
The reference library offers a very wide range of speed / compression trade-off, and is backed by an extremely fast decoder (see benchmarks below)..
What is Zstandard compression in Facebook?
Zstandard, or zstd as short version, is a fast lossless compression algorithm, targeting real-time compression scenarios at zlib-level and better compression ratios.
It's backed by a very fast entropy stage, provided by Huff0 and FSE library. Zstandard's format is stable and documented in RFC8878..
Here is the link facebook/zstd .
There are other compression mechanisms are also present viz zlib, gzip, Zip etc.
According to FB, zstd is providing much better performance compared to zlib which is used traditionally._{Mar 20, 2015}
LZMA, short for Lempel-Ziv-Markov chain-Algorithm, is a data compression algorithm.
It uses a dictionary compression scheme somewhat similar to LZ77 and features a high compression ratio (generally higher than bzip2) and a variable compression-dictionary size.
The Lempel–Ziv (LZ) compression methods are among the most popular algorithms for lossless storage.
DEFLATE is a variation on LZ optimized for decompression speed and compression ratio, but compression can be slow.

Aug 31, 2016Most algorithms have "levels” based on time/space trade-offs: The higher the level, the greater the compression achieved at a loss of

Zstandard, or zstd as short version, is a fast lossless compression algorithm, targeting real-time compression scenarios at zlib-level and better compression ratios.

Zstandard, or zstd as short version, is a fast lossless compression algorithm, targeting real-time compression scenarios at zlib-level and better Releases 66README.mdIssues 153Pull requests 28

Benchmarks

For reference, several fast compression algorithms were tested and compared on a desktop running Ubuntu 20.04 (Linux 5.11.0-41-generic)

The case for Small Data compression

Previous charts provide results applicable to typical file and stream scenarios (several MB). Small data comes with different perspectives

Build instructions

Makefile If your system is compatible with standard make (or gmake)

Testing

You can run quick local smoke tests by running make check. If you can't use make, execute the playTest.sh script from the src/tests directory

Status

Zstandard is currently deployed within Facebook and many other large cloud infrastructures

License

Zstandard is dual-licensed under BSD OR GPLv2

Contributing

The dev branch is the one where all contributions are merged before reaching release. If you plan to propose a patch, please commit into the dev branch

How do compression algorithms work?

Most compression algorithms work through a combination of methods

One of the most common involvereplacing repeated strings of characters with references

Very simplistically: let's say that within the coding of a particular file the string "ABCDEFGHIJKLMNOPQRSTUVWXYZ" occurs 100 times

What is Facebook's algorithm?

Colloquially, we use the term “Facebook’s algorithm” as though there’s only one

In fact, Facebook decides how to target ads and rank content based on hundreds, perhaps thousands, of algorithms

Some of those algorithms tease out a user’s preferences and boost that kind of content up the user’s news feed

Zstandard is a fast real-time, lossless data compression algorithm and compression tool which offers high compression ratios, developed by Facebook.Zstandard is a fast compression algorithm, providing high compression ratios. It also offers a special mode for small data, called dictionary compression. The reference library offers a very wide range of speed / compression trade-off, and is backed by an extremely fast decoder (see benchmarks below).

Facebook compression algorithm

How does a compression algorithm work?

How does the zstd algorithm work?

What image compression does Facebook use?

What is the new compression algorithm for Facebook?

What is Zstandard compression in Facebook?