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1. Welcome to the Encode's Forum!
It's probably the biggest forum about the data compression software and
algorithms on the web! Here you can find state of the art compression
software, detailed description on algorithms, the latest news and, most
importantly, you may ask a professional and get the answers! Join us today!
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THREAD: ULTRA-FAST LZ
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1. 13th July 2017, 22:23 #211
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
519 Times in 199 Posts
> The brand new ULZ v0.06 is here!
>
> It's byte-aligned LZ77 with a 16MB window (=block size). Now it looks
> like an LZ4 with a large window. For literal run length coding I make use
> of EncodeMod as described by Charles Bloom. I'm not 100% sure about the
> Optimal Parsing here - currently ULZ uses some ad hoc solution for
> hard-to-compress files - and looks like it does work!
>
> Anyway, enjoy new release! :D
>
> Some testing results (Intel Core i7-4790K @ 4.6GHz, 32GB @ 1866MHz DDR3
> RAM, RAMDisk)
>
> Code:
>
> Z:\>ulz c9 enwik9
> Compressing enwik9:
> 1000000000 -> 291028084 in 325.732 sec
>
> Z:\>ulz d enwik9.ulz e9
> Decompressing enwik9.ulz:
> 291028084 -> 1000000000 in 1.110 sec
>
> Z:\>ulz c enwik9
> Compressing enwik9:
> 1000000000 -> 365851618 in 30.323 sec
>
> Z:\>ulz d enwik9.ulz e9
> Decompressing enwik9.ulz:
> 365851618 -> 1000000000 in 1.072 sec
>
> Z:\>ulz c1 enwik9
> Compressing enwik9:
> 1000000000 -> 421011442 in 7.379 sec
>
> Z:\>ulz d enwik9.ulz e9
> Decompressing enwik9.ulz:
> 421011442 -> 1000000000 in 0.950 sec
Attached Files
* ulz006.zip (48.3 KB, 465 views)
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2. THANKS (7):
> avitar (15th July 2017),Cyan (14th July 2017),hunman (21st July
> 2017),Matt Mahoney (14th July 2017),Mike (13th July
> 2017),RamiroCruzo (18th July 2017),xezz (15th July 2017)
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3. 14th July 2017, 03:47 #212
Matt Mahoney
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Expert
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Join Date May 2008 Location Melbourne, Florida, USA Posts 3,267 Thanks 313
Thanked 831 Times in 499 Posts
> Congrats on the world's fastest decompressor. :)
> http://mattmahoney.net/dc/text.html
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4. THANKS (2):
> encode (14th July 2017),Mike (14th July 2017)
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5. 31st August 2017, 15:01 #213
boxerab
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Join Date May 2014 Location Canada Posts 142 Thanks 75 Thanked 21 Times in
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> Is this compressor open source, or binary only ?
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6.
7. 31st August 2017, 17:29 #214
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
519 Times in 199 Posts
> Originally Posted by boxerab
> Is this compressor open source, or binary only ?
> At this moment, it is binary only!
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8. THANKS:
> boxerab (1st September 2017)
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9. 23rd March 2019, 12:39 #215
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
519 Times in 199 Posts
> Well, I'm about to release the ULZ as an open source (public domain) data
> compression library. With minimalistic and simplest interface. The
> library consists of ULZ.HPP - the library itself and ULZ.CPP - simple
> demo compressor.
> The usage is as simple as that:
>
> Code:
>
> int comp_len=ulz->Compress(in, in_len, out, level);
>
> I'm undecided about the compressor configuration. Currently I have:
> 16-bit window with rep offsets (a la LZ4 competitor)
> 17-bit window
> 18-bit window
> 18-bit window with 4 rep offsets
> 19-bit window
> 21-bit window with rep offsets (actual window size is limited to 2 GB)
> 22-bit window with rep offsets (same unlimited window as with 21-bit
> version)
> 24-bit window (ULZ v0.06 modification)
>
> At this time I'm planning to keep the Greedy (unoptimized) parsing only,
> for simplicity.
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10. THANKS (3):
> Hakan Abbas (23rd March 2019),hunman (5th April
> 2021),moisesmcardona (23rd March 2019)
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11. 23rd March 2019, 12:43 #216
algorithm
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Join Date Apr 2015 Location Greece Posts 143 Thanks 45 Thanked 40 Times in
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> Decompressor should include out_len for buffer over run.
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12.
13. 23rd March 2019, 12:59 #217
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
519 Times in 199 Posts
> All compressed/raw size storage is up to the user. Simply write raw_len
> within your stream.
> and do
>
> Code:
>
> int out_len=ulz->Decompress(in, comp_len, out);
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14.
15. 23rd March 2019, 13:05 #218
algorithm
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Join Date Apr 2015 Location Greece Posts 143 Thanks 45 Thanked 40 Times in
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> out_len should be included for malicious files that during decompression
> produce larger file than specified in the format and thus cause buffer
> overrun.
> should be
>
> Code:
>
> size_t Decompress(in, comp_len, out, out_len) or
> int Decompress(in, comp_len, out, out_len)
>
> Also see the LZ4 which has similar API.
> Last edited by algorithm; 23rd March 2019 at 14:07.
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16. THANKS (2):
> Bulat Ziganshin (23rd March 2019),encode (23rd March 2019)
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17. 23rd March 2019, 14:33 #219
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
519 Times in 199 Posts
> Well, or at least:
>
> Code:
>
> ulz->Decompress(in, comp_len, out, BLOCK_SIZE);
>
> or
>
> ulz->Decompress<BLOCK_SIZE>(in, comp_len, out);
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18.
19. 23rd March 2019, 18:18 #220
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
519 Times in 199 Posts
> Added buffer overrun protection!
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20.
21. 24th March 2019, 11:31 #221
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
519 Times in 199 Posts
> Here you go:
> https://compressme.net/#downloads
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22. THANKS (9):
> algorithm (24th March 2019),Bulat Ziganshin (24th March 2019),Cyan (25th
> March 2019),introspec (29th March 2019),jibz (24th March 2019),Mike (24th
> March 2019),moisesmcardona (24th March 2019),spark (26th March
> 2019),svpv (25th March 2019)
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23. 24th March 2019, 12:31 #222
algorithm
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> So ulz is similar to lz4 with 17 bits window ,3 bit run length 4 bits
> match length and larger run and match lengths encoded as variable length
> integers of length multiple of 7 bits.
>
> I think for g++ you must use ftello with _FILE_OFFSET_BITS defined as 64.
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24. THANKS:
> encode (24th March 2019)
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25. 24th March 2019, 13:09 #223
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
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> Thanks! Added g++ support.
> And yep, you are correct about the ULZ algorithm description.
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26.
27. 24th March 2019, 16:01 #224
moisesmcardona
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Join Date Jun 2009 Location Puerto Rico Posts 286 Thanks 177 Thanked 72
Times in 53 Posts
> A recommendation, for binary files it's best to use the Release section
> ;)
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28. THANKS:
> encode (24th March 2019)
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29. 25th March 2019, 02:29 #225
Shelwien
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Join Date May 2008 Location Kharkov, Ukraine Posts 4,905 Thanks 432 Thanked
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> 7820X @ 4.5Ghz, ramdisk
>
> Code:
>
> 5.188s 1.000s: ulz_ic19_SSE2-O1-ipo.exe c1 enwik9 x & ulz_ic19_SSE2-O1-ipo.exe d x y
> 5.219s 1.016s: ulz_ic19_SSE2-O3-ipo-PGO.exe c1 enwik9 x & ulz_ic19_SSE2-O3-ipo-PGO.exe d x y
> 5.313s 1.015s: ulz_VS2017.exe c1 enwik9 x & ulz_VS2017.exe d x y
> 5.328s 1.015s: ulz_clang9_k8.exe c1 enwik9 x & ulz_clang9_k8.exe d x y
> 5.375s 1.015s: ulz_ic19_SSE2-O3-ipo.exe c1 enwik9 x & ulz_ic19_SSE2-O3-ipo.exe d x y
> 5.391s 1.015s: ulz_ic19_SSE2-O3.exe c1 enwik9 x & ulz_ic19_SSE2-O3.exe d x y
> 5.391s 1.032s: ulz_gcc82_k8.exe c1 enwik9 x & ulz_gcc82_k8.exe d x y
> 5.406s 1.015s: ulz_ic19_SSE2-O2-ipo.exe c1 enwik9 x & ulz_ic19_SSE2-O2-ipo.exe d x y
> 5.453s 1.032s: ulz_gcc82_k8-lto.exe c1 enwik9 x & ulz_gcc82_k8-lto.exe d x y
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30. THANKS (4):
> encode (25th March 2019),Mike (25th March 2019),moisesmcardona (25th
> March 2019),spark (26th March 2019)
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31. 29th March 2019, 22:05 #226
dnd
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Join Date Mar 2013 Location Worldwide Posts 751 Thanks 97 Thanked 300 Times
in 215 Posts
> ULZ added into Turbobench Compression Benchmark
> Homepage - Twitter - Github
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32. THANKS:
> encode (29th March 2019)
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33. 3rd April 2019, 14:03 #227
FatBit
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Join Date Jan 2012 Location Prague, CZ Posts 195 Thanks 0 Thanked 36 Times
in 27 Posts
ULZ TEST
> Dear colleagues,
>
> I woud like to share my results for tar file compression (tarred files
> from my benchmark for FileOptimizer) on "average" pc.
>
> Best regards,
>
> FatBit
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34. THANKS:
> encode (3rd April 2019)
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35. 6th April 2019, 23:22 #228
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
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> Some testing results of the ULZ with Optimal Parsing + modifications:
>
> No code has to be inserted here.
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36.
37. 14th April 2019, 22:40 #229
jibz
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in 54 Posts
> Originally Posted by encode
> Added buffer overrun protection!
> Btw, I found a couple of places where bad input could still result in a
> buffer overrun, I opened a pull request with some fixes on the GitHub
> page.
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38. THANKS:
> encode (15th April 2019)
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39. 15th April 2019, 00:19 #230
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
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> Thanks a bunch! Already added these fixes to the upcoming release!
> In addition, I've already added a Fast compression mode (CompressFast())
> Completed the CompressOptimal() (but it will be not included in the
> upcoming release)
> My main concern for now is the Normal mode.
> Hash chains are good, but 2-byte lookahead in v1.00 is too slow.
> Double hash chains / my MMC implementation failed here - too much time
> spent on pointer setup.
> Binary tree with partial updates my main thing for experiments for now...
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40. THANKS (2):
> avitar (15th April 2019),jibz (15th April 2019)
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41. 19th April 2019, 10:53 #231
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
519 Times in 199 Posts
> ULZ v1.01 BETA has been released:
> https://compressme.net/#downloads
>
> + New fast compression mode (c1, default)
> + Safer decompressor
> + Reconfigured compression levels:
>
> 1 - CompressFast(), HashTable-based match finder
> 2..4 - Compress(), Hash chains, Greedy parsing
> 5..9 - Compress(), Hash chains, Non-greedy 1-byte lookahead
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42. THANKS (5):
> avitar (23rd April 2019),Bulat Ziganshin (22nd April 2019),comp1 (19th
> April 2019),jibz (20th April 2019),Mike (19th April 2019)
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43. 22nd April 2019, 17:39 #232
smjohn1
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> What is the O bit?
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44.
45. 22nd April 2019, 17:53 #233
encode
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> Originally Posted by smjohn1
> What is the O bit?
> Higher bits of an Offset (Match Distance)
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46.
47. 22nd April 2019, 21:12 #234
smjohn1
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> OK, thanks.
>
> Originally Posted by encode
> Higher bits of an Offset (Match Distance)
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48.
49. 28th April 2019, 19:22 #235
FatBit
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ULZ TIMING UPDATE
> Best regards,
>
> FatBit
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50. THANKS:
> encode (28th April 2019)
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51. 28th April 2019, 22:12 #236
Sportman
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Join Date Aug 2008 Location Planet Earth Posts 1,436 Thanks 211 Thanked 715
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> ULZ v1.01 BETA:
>
> Input:
> enwik9
>
> Output:
> 460,463,054 bytes, 3.158 sec. - 0.742 sec., c1
> 409,136,504 bytes, 5.848 sec. - 0.757 sec., c2
> 393,640,476 bytes, 7.711 sec. - 0.721 sec., c3
> 383,318,792 bytes, 10.716 sec. - 0.719 sec., c4
> 363,151,876 bytes, 23.298 sec. - 0.768 sec., c5
> 359,939,352 bytes, 31.166 sec. - 0.766 sec., c6
> 358,155,488 bytes, 39.326 sec. - 0.786 sec., c7
> 357,230,196 bytes, 47.285 sec. - 0.763 sec., c8
> 356,494,682 bytes, 65.747 sec. - 0.763 sec., c9
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52. THANKS:
> encode (28th April 2019)
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53. 28th April 2019, 22:38 #237
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
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> @Sportman
> System specs?
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54.
55. 28th April 2019, 23:18 #238
Sportman
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Join Date Aug 2008 Location Planet Earth Posts 1,436 Thanks 211 Thanked 715
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> Originally Posted by encode
> System specs?
> Z370
> i9-9900K at 5.3GHz (16MB cache)
> 32GB DDR4 4266MHz
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56. THANKS:
> encode (29th April 2019)
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57. 29th April 2019, 00:36 #239
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
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> Thanks! Traditionally and through the years, you have a very nice PC
> specs!
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58.
59. 14th March 2021, 11:37 #240
encode
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Join Date May 2006 Location Moscow, Russia Posts 4,119 Thanks 573 Thanked
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> Check out a new BETA version made to test some new ideas!
> It's still a byte aligned LZ77, window size is 64 KB.
Attached Files
* ulz102BETA.zip (61.4 KB, 127 views)
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60. THANKS (4):
> comp1 (17th March 2021),danlock (16th March 2021),kimstik (4th May
> 2023),Mike (14th March 2021)
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