It takes no compression options. Feb 21 2008 - added durilca4linux_3. options, e for normal and ex for better but slower compression. Compression time increases approximately exponentially with the -l value. Program Options enwik8 enwik9 size (zip) enwik9+prog Comp Decomp Note except SFX) of enwik8 before and after the XML-WRT transform with option -f180 R. Tamayo, Sept. 15, 2022. Sep 02 2006 - corrected error in lexical analysis table on data page (found by Szymon Grabowski). encoded using an interleaved Elias Gamma code. thor 0.9a ex 41,670,916 368,669,696 61,556 x 368,731,252 54 51 5.5 There is also an "indirect" version that was not tested because there was no It supports parallel compression and decompression by dividing the It takes no options. The input is parsed into seqences of all uppercase letters or all lowercase letters, or one The program reads from a file and outputs to stdout like this: selected by options c0 through c5 as follows: source code is a free, 27 (Indirect) 36,108,281 4,773 x 2700 3090 1182 26 It uses CM. May 26 2009 - added decmprs8. which was tested below. At this point all codes have frequencies that are a power of 1/2 and codes are assigned. file compressor by Michael Schindler, Mar. is a free, open source (C and MASM) file compressor by Joergen Ibsen, Program Options enwik8 enwik9 size (zip) enwik9+prog Comp Decomp Mem Alg lpaq6e is tuned for large text files. arbc0 63,501,994 644,561,590 5,988 sd 644,567,578 2459 2606 1.5 o0 An update appends to an archive 8, 2008. These programs are unique for their small executable size. Apr 05 2007 - added quad 1.11, quad 1.11HASH2, ccm 1.20a, updated FreeArc description. is a free Windows command line file compressor 19, 2007. .3676 lzw was released Nov. 19, 2014. and 20 undocumented options each specified by a single digit. -b488282 169,396,680 60,990 x 169,457,670 472 341 2440 BWT 28 The model is based on fpaq0p (adaptive order 0), but with probabilities .3626 urban lzsr 0.01 is a free file compressor -mx -b512 -h4 25,348,872 213,722,850 265,102 x 213,987,952 767 26 1500 LZ77 48 The decompressor source code "-Dexp=expand" removes a compiler error due to a K&R style redefinition of exp(). It takes one Memory usage depends on the input size. Memory usage per thread zstd 0.6.0 -22 236,376,273 69,687 s 236,445,960 473 1.6 LZ77 76 was released Feb. 19, 2012. fpaq0pv4a Added fpaq0s5. Version 1.40 (Nov. 13, 2007) is an experimental version designed for better speed. lzw v0.2 was released with (adding 79,360 bytes). turtle v0.05 28,860,689 251,626,176 9,779 x 251,635,955 242 203 174 PPM .4092 srank are packed 8 to a byte, followed by up to 8 literals for each incorrect guess. A literal of length 1 to 60 is encoded by storing the length - 1 in the upper 6 bits. includes default is to use 1 less than the number of cores, up to 16 threads. -q 9 30,227,246 407 4.7 68 6 LZ77 48 (SDK released Jan. 8, 2002). Aug 13 2006 - typo in Rationale. "attrib -r" before they can be modified or deleted. file compressor and archiver by Matt Mahoney, Jan. 21, 2011. version runs at high priority. -mx5 selects History is collected in a context sorted ring (like BWT) called a "funnel of ------- ---------- ----------- ------- ----------- ---- ---- --- --- It is a faster TarsaLZP Aug 10 2007 25,135,357 215,301,079 3,546 xd 215,304,626 269 322 341 LZP Only the latest version (now open source) is supported, so only that version open(TMP2,"tmp2")||die "$! uses ROLZ. command line optimizer and file compressor by Serge Osnach, Oct. 16, 2003. Compression Compressed size Decompresser Total size Time (ns/byte) can be obtained by using -M to select one block for the whole file. The option -ex selects maximum compression. -d26 25,091,033 279 7.3 LZ77 70 for Windows by Nania Francesco Antonio, Oct. 1, 2011. from 4 MB to 64 MB, which effectively increases the context from order-4 to components in the chain each mix the next lower order prediction using a A newer version, 1.02 rc1 Aug 06 2006 - added the Hutter Prize, renamed Large Text Compression Benchmark to Human Knowledge Compression Contest, Choosing higher than -d127 causes decompresser to either output garbage or crash. lengths from 2 up to the number of unused bytes - 1. faster with better compression. Method 6 (auto-pick best) 24,419,299 212,392,465 1,015,808 x 213,408,273 2149 68 12 RH2_x86 c1 34,857,781 67 27 64 LZP 26 All levels use 9 MB memory for compression or May 29 2007 - added fpaq02. maximum compression. Jan 19 2010 - added kwc. follows: lzf 1.02 .2104 pim This is smaller than the source Note: I reduced the memory setting from 1800 to 1700 to prevent disk thrashing, For example, if the symbols and their frequencies are A=3, B=2, C=1, then the sum (6) is Sizes are as reported by right clicking on the compressed Oct. 12, 2012. bzip2 1.0.3 was released Dec. 11, 2009. The option -m lzx:21 selects a window size of 221 Some of these options was released June 2, 2007. using MinGW 3.4.2 as specified in the Makefile. Apr 14 2014 - added libzling 20140414. hook v0.2 is a free, It is an order 2 model based on the order 0 compressor fpaq0s by David A. Scott, Jun 18 2008 - added flzp v1. -skip-checksums is not used because it has no effect on compression. rather than as pointers. Matches to a context length of 12 or more are -f64 sets minimum word frequency for the dictionary to 64. open source file compressor by P. M. Fenwick, originally written Sept. 5, 1996 Optimal encoding on discrete lattice with translational invariant constrains Run times are (2+41+2132, using both cores. gzip and many zip-compatible programs. It uses PPM. Oct 27 2008 - added nanozip 0.05a. Feb 04 2008 - added flashzip 0.3. (CAUTION, this will make your computer unusable while running). balz 1.09 ex 26,534,257 229,476,459 49,928 x 229,526,387 4049 128 201 ROLZ (Vic 20, Commodore 64, Commodore 128 and Commodore Plus 4/C16) in 6510 and if L is in 1..15 then P is L + 5 bits (65..221). 21, 2007) has only one version. .2328 qc However, compression could be improved by using larger blocks at fpaq0s5 30,374,122 266,244,843 4,027 s 266,248,870 480 419 200 PPM Jan 17 2007 - completed dmc and Info-Zip 2.3.1. an archive is compressed with one of these three models and decompresses Task Manager in this mode was 360 MB for compression and 107 MB for decompression. epmopt compressed this about 100 times in The memory size must also be given for decompression. May 08 2009 - updated opendark-A. Text is not affected. 5, 2007, experimental, no source code) produces the same size archives, but uses is a free, closed source file comprssor by Dec 24 2006 - added quad v1.01a, tc 5.1 dev 7. Aug 07 2007 - added lzpm 0.07. file compressor by Ilia Muraviev, Jan. 30, 2008. matches as the compressor. paq8hp10 compression in separate threads. The command e370 means to use a block size of 370 MB. --------- --- --------- ----------- ------- ----------- ---- ---- --- ---- maximum compression. times including disk I/O in ns/byte, with CPU (process) times in parenthesis. There is a smaller, separate program (unlzp2) that only was compiled with MinGW gcc 4.8.0. with option -O3. .2190 PX comprox 0.6.0 was released Aug. 24, 2012. Oct. 12, 2012. Program Options enwik8 enwik9 size (zip) enwik9+prog Comp Decomp Mem Alg was released Dec. 8, 2009. RangeCoderC v1.4 27 (Hashed) 30,371,685 271,371,793 4,407 x 271,376,200 1809 1658 1050 26 with 2 hyperthreads each. To decompress, QUAD uses ROLZ compression (Reduced Offset LZ). Memory is used slowly as the program runs up to a maximum value which is not reached on SARS-CoV-2 Coronavirus Data Compression Benchmark Virtual c2 32,215,361 282,209,254 48 14 64 ROLZ 48 (P+W+C) 22,023,144 178,321,588 11,203 sd 178,332,791 36828 6.6 1800 Dict 67 It costs $29 with a 40 day free trial quantized using the PAQ's state machine since CMM4 (will be replaced). As an optimization for hard to Sep 01 2006 - updated bbb, TarsaLZP, paq8hp2 (as a preprocessor). -p1 selects 1 thread. LL or LLL is the 2 or 3 If zpaq encounters a transition count (ny for y=0) from state 1111 exceeded a limit. It uses arithmetic coding with 16 bit probabilities (rather than 12 bits). select "File/compress single file" from the upper menu, Options enwik8 enwik9 size (zip) enwik9+prog Comp Decomp Mem Alg Note of CPU (process) time and the rest for disk I/O. The command e370 means to use a block size of 370 MB. but uses a 16K sliding window and 128 byte look-ahead buffer. Ross Williams in 1991. balz 1.20 It uses ROLZ plus arithmetic coding. (2+51+2691, 2+2682+38 sec). even with -t set. This is faster because it avoids a division quad v1.11 -x 29,110,579 256,145,858 13,387 s 256,159,245 956 116 34 ROLZ c2 32,215,361 282,209,254 48 14 64 ROLZ 48 Compression requires compressing with gzip, bzip2, or ppmd. fpaq0pv4b1 61,287,234 620,488,244 56 60 Eugene Shelwien Apr 18 2008 The memory size must also be given for decompression. -9 selects maximum compression. with ppmd (similar to XMill). models from v1.4 into one program and includes the model type in the archive header. Compression Compressed size Decompresser Total size Time (ns/byte) or 2N8 respectively. lcssr 0.2 (Dec. 3, 2007, same website) strings of 6 bytes each, and each value is replaced with a dictionary code. CTW 0.1 is a free, command line file compressor with source has 3 compression levels, from -c0 (fastest) to -c2 (best). numbers compressing slower without affecting decompression speed. For this test -b1 32,088,940 148 125 70 ROLZ uses a deep hash table (8 offsets per hash) with LRU replacement. might give better compression, but were not tested. and last updated Apr. 4 MSBs and on the coding order. blocks. lzrw5 (July 17, 1991) uses LZW. I wrote the following Perl scripts to compress and decompress. For this test, the source was compiled with MinGW g++ 4.8.0 using the supplied suffix sorting and BWT construction algorithms. First, the decompresser appends a 2 byte A. Scott in which the starting index is not stored. In addition, QUAD "Data Compression using Dynamic Markov Modelling", Subsets (e.g. 6, 2008, as discussed .2139 boa Jun 05 2007 - added turtle 0.03. zstd 0.4.2 -1 40,799,603 358,186,203 289,735 s 358,475,938 7.1 3.6 2 LZ77 48 The compressed file has a 4 byte header containing the file size. and level 9 (1..9) for best compression. Redundancy Off, Text Encoding None, Encrypt archive disabled, Segment archive disabled. .1984 WinRAR 26, 2007. lzgt3 54,253,334 1,963 sd 889 280 1 LZ77 .5902 lzbw1 Apr 21 2009 - added paq8p3, paq8p3 v2. single file compressor by Julian Seward, released Dec. 30, 2001. To reduce the size of the coding tables, q is quantized to R=7 bits on a nonlinear file to be omitted, in which case it simply compresses. glza 0.2 was released May 24, 2015. fpaq0pv4nc 61,350,834 621,169,159 64 69 Eugene Shelwien Apr 06 2008 free command line file compressors by Dmitry Shkarin (model) and . CRC32 is replaced with Adler32. 5x block size memory. c3 30,960,001 271,181,799 67 17 64 ROLZ 48 packet 1.0 precomp compresses JPEG files initialization file. May 03 2007 - added paq8hp11any -8 enwik8, fpaq0p. Program Options enwik8 enwik9 size (zip) enwik9+prog Comp Decomp Mem Alg Note Jan 09 2008 - added fpaq0r, fpaq0rs*, ranked lpaq8e, lcssr 0.2. fpaq3 (Nov. 20, 2006) is an order 3 compressor. -b1..b6. in which bytes 0-31 code a literal of that length, and 32-255 code a flashzip 0.99c1 (June 1, 2011) improves compression and speed. 16, 2007) has 4 modes (0-3) with 4 separate executables. Feb 06 2021 - added nncp v2.1. lzw 0.2 41,960,994 367,633,910 671 s 367,634,581 3597 31 18 LZW Program Opt enwik8 enwik9 prog (zip) enwik9+prog Comp Decomp Mem Alg parallel execution. Added fpaq0x1b. (Ubuntu 2.6.15.27-amd64-generic) on a 2.2 GHz Athlon-64. RH uses order 3 ROLZ and Huffman coding, using 8 MB Compression Compressed size Decompressor Total size Time (ns/byte) 0 to 9). Dec 16 2007 - uploaded symbra 0.2, lcssr 0.2 mirrors, added fpaqa*, hook 1.3, lzpm 1.3, cmm1, cmm2. it requires a rb..rb+23 bit code. a single core processor. sr2 is a free, balz 1.15 was released as open source It was written in K&R C for except the input and output filenames. quad v1.12 -x 29,110,519 256,145,858 13,516 s 256,159,334 527 120 34 ROLZ file compressor by Ilia Muraviev, Jan. 30, 2008. B to A). blocks. turtle 0.05 arbc1 (order 1), and arbc0 (order 0), all of which are bijective. -x selects maximum compression. ------- ---------- ------ ---- Total size flashzip 0.99d1 was released Oct. 31, 2011. Dec 17 2007 - corrected cmm1, cmm2, ranked cmm1. It uses PPM. WinTurtle 1.21, Aug. 16, 2007, `pucrunch -d -c0 tmp1 tmp2`; assigned by replacing the oldest codes first, starting with 256. cf, c, and cx respectively. bee 0.78 build 0154 pkzip 2.0.4 36,934,712 327,607,376 29,184 xd 327,636,560 123 44 1.7 LZ77 8 26,890,422 9330 62 723 ROLZ Apr 05 2007 - added quad 1.11, quad 1.11HASH2, ccm 1.20a, updated FreeArc description. .1984 WinRAR If step 2 does not compress, then the first byte is removed and a It was tested on a 2.66 GHz Core i7 M620 (2 cores x 2 hyperthreads per core) as in note 48. It uses up to 384K memory plus buffers. 18, 2008, replaces the arithmetic coder with Only the latest version (now open source) is supported, so only that version Jan 02 2009 - added M1 0.3. Sep 06 2007 - added lzpm 0.11. Higher levels It includes two dictionary files which must (mirror with .exe) Compressor Opt enwik8 enwik9 Prog Total Comp Decomp Mem Alg Note for each audio sample. decompression. The option does not affect letters converted to upper case, ignoring all other characters Compression Compressed size Decompresser Total size Time (ns/byte) -b1000 20,825,972 164,654,285 61,974 x 164,716,259 281 214 5000 BWT 50 It takes no options. experimental file compressor by Nania Francesco Antonio, May 11, 2008. order-5. tree 0.16b 21,602,648 173,848,464 13,395 sd 173,861,859 114739 8.1 1693 Dict 67 here. and instead uses a variable length context based on the length of the The third, TreeBitEncode.c .2428 comprox_ba using 1 to 5 digits in the low 7 bits. pucrunch is a free, I estimated 9 seconds for compressing with gzip, bzip2, or ppmd. The algorithm is designed for speed rather than good compression. Apr 24 2015 - added xz 5.2.1. 27, 2015. is a free, open source (C and MASM) file compressor by Joergen Ibsen, intermediate temporary file (file.dp) that removes the duplicates. zcm 0.93 was released May 12, 2015. Compression Compressed size Decompresser Total size Time (ns/byte)
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