Results 1 to 6 of 6

Thread: Maximum Practical Compression

  1. #1
    Programmer Bulat Ziganshin's Avatar
    Join Date
    Mar 2007
    Location
    Uzbekistan
    Posts
    4,497
    Thanks
    733
    Thanked 659 Times in 354 Posts
    about half year ago i've written small article about current "best practical" compressors. now i'm glad to present its english translation: http://freearc.org/Maximal-Practical-Compression.aspx

    due to age, it doesn't mention RZM and up-to-date versions of LPAQ/CCM with improved speed/compression

  2. #2
    Administrator Shelwien's Avatar
    Join Date
    May 2008
    Location
    Kharkov, Ukraine
    Posts
    3,134
    Thanks
    179
    Thanked 921 Times in 469 Posts
    I wonder if you use your freearc yourself, and how if you do (and how frequently).

    Here's my history of real compression application:
    199x:
    rar32 under DOS + 2mgui, to fit more data onto 1.44" discs.
    2003:
    my pkt preprocessor+ppmonstr+sh002 for fido echomail exchange at 26.4kbit
    2005:
    (got 64k adsl)
    mp3zip for mp3 albums compression on the remote server
    unshield/7z/cabextract to repack program installations on the shell
    (btw repack with rar, because it was preinstalled on the server and
    also 7zip's exe-filter is troublesome; also rar had better compression
    under server's memory usage restrictions (~100M)).
    2007:
    (512k unlim became available)
    avip+mp3zip+rar for 5-20% compression of avi movies
    2008:
    (upgraded to 4M)
    no compression is required, continuing to use rar for archiving, but
    nothing would change even if I'd completely disable its compression,
    also its more convenient than tar (or 7zip) as archival tool.
    current applications for compression (without any tools available)
    - a proxy with online compression of avis and such
    (manual compression isn't worth my time)
    - compression of DVD images (mostly video)

    Guess, someone might think its funny that I don't have much applications
    for compression, but still am working on it.
    But there's a small difference. Right from the start, I'm interested in
    the modelling part. And compression is just an objective measure of
    model performance, while for all AI tasks (eg. OCR/speech recognition)
    good modelling is necessary... and for _all_ other tasks it might be
    useful if lots of unused computing power is available (which we have now)
    (eg. DB caching mechanism... or password cracking like in JtR, but with
    a proper model).

  3. #3
    Guest
    "During my tests in 10-20% of cases it crashes while building archive or couldn’t extract it. Maybe you will be more lucky (I have compressed huge file sets)"

    i guess WinRK have 4gb limit, because it always stops working at that point

    Ps
    if i remember correcly it can't create >4Gb archives

  4. #4
    Programmer Bulat Ziganshin's Avatar
    Join Date
    Mar 2007
    Location
    Uzbekistan
    Posts
    4,497
    Thanks
    733
    Thanked 659 Times in 354 Posts
    Zonder, my tests are about 30-100mb long but contains several thousands of files

  5. #5
    Member
    Join Date
    May 2008
    Location
    Earth
    Posts
    115
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Confirmed. On one of my "testsets"(actually it's a directory which contanis a lot of executables) WinRK's progress stops. It's only 23mb large and contains 827 files.

  6. #6
    Programmer Bulat Ziganshin's Avatar
    Join Date
    Mar 2007
    Location
    Uzbekistan
    Posts
    4,497
    Thanks
    733
    Thanked 659 Times in 354 Posts
    Quote Originally Posted by Shelwien
    I wonder if you use your freearc yourself
    not much. but we know that now there is now good all-purpose archiver. 7zip lacks many features while rar lacks modern compression so its my hobby. taking into account that there are no so many areas where i can deliver world-class results, its no bad hobby

Similar Threads

  1. Most efficient/practical compression method for short strings?
    By never frog in forum Data Compression
    Replies: 6
    Last Post: 1st September 2009, 04:05
  2. Replies: 11
    Last Post: 20th February 2008, 11:39
  3. Best practical archiver
    By nimdamsk in forum Forum Archive
    Replies: 34
    Last Post: 24th March 2007, 21:51

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •