zstandard-overview.html
I recently realised that, while there is a specification for Zstandard, which describes in great details what is encoded where, there is no “overview†of the format, which would be neither too detailed nor too vague for programmers with a casual interest in data compression to understand its inner working. This blog post is an attempt to correct that. Introduction Zstandard is an LZ77-class compre
Zstd Compression For Btrfs & Squashfs Set For Linux 4.14, Already Used Within Facebook - Phoronix
Zstd Compression For Btrfs & Squashfs Set For Linux 4.14, Already Used Within Facebook Written by Michael Larabel in Linux Kernel on 8 September 2017 at 03:50 PM EDT. 13 Comments As we've been expecting, Zstd compression for Btrfs is coming with the Linux 4.14 along with Zstd support in SquashFS. Zstd/Zstandard was developed at Facebook and offers compression similar to zip/gzip but with faster sp
Brotli を用ã„ãŸé™çš„コンテンツé…信最é©åŒ–㨠Accept-Encoding: br ã«ã¤ã„㦠| blog.jxck.io
Intro High Sierra ã«ä¹—ã‚‹ Safari 11 㧠Brotli 対応ãŒã•ã‚Œã‚‹ã¨ã„ã†ã“ã¨ã§ã€ãƒ¡ã‚¸ãƒ£ãƒ¼ãƒ–ラウザ㮠Brotli 対応ãŒæ¦‚ãæƒã†ã“ã¨ã«ãªã‚‹ã€‚ ãã“ã§ã€æœ¬ã‚µã‚¤ãƒˆã‚‚ Brotli ã«ã‚ˆã‚‹é™çš„コンテンツé…ä¿¡ã«å¯¾å¿œã—ãŸã€‚ brotli brotli 㯠Google ãŒé–‹ç™ºã—ãŸæ–°ã—ã„圧縮形å¼ã§ã‚る。 Brotli Compressed Data Format LZ77 ã¨ãƒãƒ•ãƒžãƒ³ç¬¦å·åŒ–ã‚’åˆã‚ã›ãŸã‚‚ã®ã§ã‚ã‚Šã€å…ƒã€…㯠WOFF2 ã®ä»•æ§˜ã®ä¸€éƒ¨ã¨ã—ã¦ä½œã‚‰ã‚ŒãŸã‚‚ã®ãŒã€æ±Žç”¨åŒ–ã•ã‚ŒãŸã‚‚ã®ã§ã‚る。 éŽåŽ»ã«å…¬é–‹ã•ã‚Œã¦ã„ã‚‹ zopfli ã¨æ¯”ã¹ã¦ã‚‚ã€ã•ã‚‰ã«åœ§ç¸®çŽ‡ãŒ 20-26% å‘上ã—ã¦ãŠã‚Šã€è§£ç”速度㯠zlib 相当ã¨ã•ã‚Œã¦ã„る。 ã“ã®åŠ¹æžœã«å¯„与ã™ã‚‹ç‰¹å¾´çš„ãªè¦å› ã¨ã—ã¦ã€ä»•æ§˜ã«å«ã¾ã‚Œã‚‹è¾žæ›¸ãŒæŒ™ã’られる。 Static Dictionary 圧縮アルゴリズムã¯ã€ç°¡å˜ã«è¨€ãˆã°é »å‡ºã™ã‚‹ä¸€è‡´éƒ¨åˆ†
Facebook Looking To Add Zstd Support To The Linux Kernel, Btrfs - Phoronix
Facebook Looking To Add Zstd Support To The Linux Kernel, Btrfs Written by Michael Larabel in Linux Kernel on 4 August 2017 at 05:48 PM EDT. 45 Comments Zstd (also known as Zstandard) is a lossless data compression developed by Facebook that has been open-source since last year. This BSD-licensed compression algorithm aims to offer compression similar to zip/gzip but with faster speeds both for co
A guide to PNG optimization
1. Background 1.1 The PNG file format The Portable Network Graphics (PNG) is a format for storing compressed raster graphics. The compression engine is based on the Deflate method [RFC1951], designed by PKWare and originally used in PKZIP. The PNG format is defined by the PNG Specification. This specification was developed by an ad-hoc group named the PNG Development Group, and it is both an Inter
Squeezing PNG Images
Ariya Hidayat (@ariyahidayat) is an engineer/technical lead/FOSS fan/blogger/speaker. These days, his activities are mostly on software craftsmanship around HTML5, JavaScript, and other web technologies. PNG is a popular format for icons, sprites, logos, screenshots, and many others. Creating PNG images is fairly easy, but what do we need to do if we want to get the smallest file possible without
LZ4m: Taking LZ4 Compression To The Next Level - Phoronix
LZ4m: Taking LZ4 Compression To The Next Level Written by Michael Larabel in Free Software on 2 June 2017 at 05:59 AM EDT. 14 Comments While LZ4 can be very fast with its compression and decompression speeds, there's a new kid on the block that appears to be even faster: LZ4m. LZ4m is a compression algorithm designed for in-memory data geared for use when dealing with data intensive applications.
Brotli - Wikipedia
Brotli[èªã¿ç–‘å•ç‚¹]ã¯ã€Jyrki Alakuijalaã¨Zoltán Szabadka（英語版）ã«ã‚ˆã‚Šé–‹ç™ºã•ã‚ŒãŸã‚ªãƒ¼ãƒ—ンソースã®ãƒ‡ãƒ¼ã‚¿åœ§ç¸®ãƒ©ã‚¤ãƒ–ラリã§ã‚ã‚‹[3][4]。 概è¦[編集] Brotliã¯LZ77ã‚„LZ78ã¨ãƒãƒ•ãƒžãƒ³ç¬¦å·åŒ–ã€ãŠã‚ˆã³2次文脈モデリング（英語版）処ç†ã®è¿‘代的ãªäºœç¨®ãŒãƒ™ãƒ¼ã‚¹ã§ã‚る。 Chromeã€Operaã€Firefoxã€Microsoft Edgeãªã©ã€Internet Explorerを除ã„ãŸä¸»è¦ãªãƒ–ラウザã¯ã“ã®ãƒ©ã‚¤ãƒ–ラリã«ã‚ˆã‚‹åœ§ç¸®ã®æ©æµã‚’å—ã‘ãŸWebブラウジングãŒå¯èƒ½ã§ã‚ã‚‹[5][6]。åŒã˜ãGoogleã«ã‚ˆã‚Šé–‹ç™ºã•ã‚ŒãŸZopfliã¨åŒã˜ãã€ã‚¹ã‚¤ã‚¹ã®ãƒ‘ンã§ã‚ã‚‹brötli（英語版）ã«ç”±æ¥ã—ã¦ã„ã‚‹[7]。 詳細[編集] Brotliã®æœ€åˆã®ç™ºè¡¨ã¯2015å¹´ã€webフォントã®ã‚ªãƒ•ãƒ©ã‚¤ãƒ³åœ§ç¸®ã‚’目的ã«ã—ã¦ã®ã“ã¨ã§ã‚ã£ãŸ[8]。åŒå¹´9月ã€Googleã®ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢
Smaller and faster data compression with Zstandard
People are creating, sharing, and storing data at a faster rate than at any other time in history. When it comes to innovating on storing and transmitting that data, at Facebook we're making advancements not only in hardware — such as larger hard drives and faster networking equipment — but in software as well. Software helps with data processing through compression, which encodes information, lik
MyRocks: A space- and write-optimized MySQL database
At Facebook we use MySQL to manage many petabytes of data, along with the InnoDB storage engine that serves social activities such as likes, comments, and shares. While InnoDB provides great performance and reliability for a variety of workloads, it has inefficiencies on space and write amplification when used with flash storage. A few years ago, we built RocksDB, an embeddable, persistent key-val
Frame of Reference and Roaring Bitmaps
Postings listsWhile it may surprise you if you are new to search engine internals, one of the most important building blocks of a search engine is the ability to efficiently compress and quickly decode sorted lists of integers. Why is this useful? As you may know, Elasticsearch shards, which are Lucene indices under the hood, split the data that they store into segments which are regularly merged
lzturbo
LzTurbo is a high performance lz77 based compressor featuring the fastest compression/decompression. Serveral times faster than the fastest compressor (see LzTurbo benchmarks) Download: LzTurbo v1.2 for windows and linux - Parallel and linear scalable compression/decompression on multiprocessor/multicore systems. - Overlapping i/o with compression/decompression. - Parallel compression/decompressio
GitHub - jasonmoo/smlr: Re-encode jpeg images with no perceivable quality loss.
smlr * This project is experimental and needs some tuning. * Re-encode jpeg images with no perceivable quality loss. Uses the butteraugli psychovisual comparison and k-ary search to determine the best jpeg quality setting that will not "appear" degraded. Installation: 1. Clone https://github.com/google/butteraugli. 2. Run `make` in the `src/` directory to build the `compare_pngs` binary. 3. Move `
GZ-Sort: A utility for sorting really big files.
Nice app, but unfortunately limited to gzipped data. Would be a lo... sources are at github git clone https://github.com/keenerd/gz-sort; cd gz-sort; make; ./gz-sort -h Gz-sort sorts gzipped data files. Really really big gzipped data files that I couldn't figure out how to wrangle with gnu-sort. After heavy tweaking gnu-sort can do some very large files indeed, but with poor big-O disk patterns. I
リリースã€éšœå®³æƒ…å ±ãªã©ã®ã‚µãƒ¼ãƒ“スã®ãŠçŸ¥ã‚‰ã›
最新ã®äººæ°—エントリーã®é…ä¿¡
j次ã®ãƒ–ックマーク
kå‰ã®ãƒ–ックマーク
lã‚ã¨ã§èªã‚€
eコメント一覧を開ã
oページを開ã
GitHub - chadnickbok/redis-zstd-module: Magically make your Redis data smaller with Zstandard compression.
Testing PGO with LZ4 and Zstd codecs
lzturbo - Compression Benchmark
GitHub - inikep/lizard: Lizard (formerly LZ5) is an efficient compressor with very fast decompression. It achieves compression ratio that is comparable to zip/zlib and zstd/brotli (at low and medium compression levels) at decompression speed of 1000 MB/s
https://blog.cloudflare.com/cloudflare-fights-cancer/
GitHub - airlift/aircompressor: A port of Snappy, LZO, LZ4, and Zstandard to Java
{{#tags}}- {{label}}
{{/tags}}