#bzip3 — Public Fediverse posts

Ok, that was really unexpected. ;)

#Compression #bzip3

386,009,603 'IMG_8676.xcf'
188,423,510 'IMG_8676.xcf.zst'  #(zstd --ultra -22 was used)
179,906,528 'IMG_8676.xcf.xz'   #(xz -9e was used)
179,719,797 'IMG_8676.xcf.7z'   #(highest options available on 7z were used, IIRC (original file))
140,906,669 'IMG_8676.xcf.bz3'  #(just bzip3, no options specified)

bzip3 is also the fastest out of these (with the given parameters)

For text with a lot of repetition, #bzip3 still blows my mind. 😆

rld@Intrepid:Documents$ for x in cat "gzip -9" "zstd --ultra -22" "xz -9e" "bzip2 -9" bzip3; do $x < weatherlog-2024.txt |wc -c |tr "\n" "\t"; echo "$x"; done
 1735300	cat
   80423	gzip -9
   63275	zstd --ultra -22
   53516	xz -9e
   52374	bzip2 -9
   40645	bzip3
rld@Intrepid:Documents$ echo 1735300/40645 |bc -l
42.69405830975519744125

#Lossless #Compression #LosslessCompression

P.S. times:

real 1.49 zstd --ultra -22
real 0.94 xz -9e
real 0.23 bzip2 -9
real 0.07 gzip -9
real 0.06 bzip3
real 0.00 cat

DANG. 😂

New #blog post: Unix Data Compression Shootout

https://rldane.space/unix-data-compression-shootout.html

881 words

cc: my wonderful #chorus: @joel @dm @sotolf @thedoctor @pixx @twizzay @orbitalmartian @adamsdesk @krafter @roguefoam @clayton @giantspacesquid

(I will happily add/remove you from the chorus upon request! :)

#100DaysToOffload #32

#rlDaneWriting #Unix #Linux #BSD #DataCompression #gzip #bzip #bzip2 #bzip3 #zstd #zst #xz #lz4 #compression

BZip3

在 Hacker News 上看到 BZip3 的連結：「Bzip3: A spiritual successor to BZip2 (github.com/kspalaiologos)」。

雖然名字看起來與 bzip2 有關，但看起來是不同的人弄出來的東西，不過有些經典的演算法有留下來用，像是 Burrows-Wheeler transform。

另外值得一提的是，bzip2 是 1996 年出的 (不過 1.0 大約是 2000 年時出的)，BZip3 的第一個 release 在 2022 年，這段時間也累積了不少有趣的演算法可以用。

無損壓縮中如果期望有比較的壓縮率，目前比較常用的應該是 LZMA 類的演算法 (差不多是 2001 年出現的)，用的工具通常會是 X

https://blog.gslin.org/archives/2025/02/02/12240/bzip3/

#Computer #Murmuring #Software #bzip2 #bzip3 #compression #lzma #ratio #xz