Results 1 to 4 of 4

Thread: FreeArc has different results on a different CPUs? Please explain.

  1. #1
    Member
    Join Date
    Jul 2011
    Location
    Amsterdam
    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts

    FreeArc has different results on a different CPUs? Please explain.

    (I already posted this on official FreeArc forum, but it seems to be dead, no views, no replies...)

    Really strange thing. I have two machines:
    Linux (Debian), E7200, 2GB RAM, 1TB HDD
    Windows7 64bit, E8400, 6GB RAM, 1TB + 0.5TB HDD

    Under Linux I have Wine, so I am using exactly same, latest version 0.666 of FreeArc (http://freearc.org/download/0.666/Fr....666-win32.exe).

    My Windows machine is always better than Linux. How is it possible? I make archive with exactly same content (sometimes just one file), exactly same settings (always Ultra, self-extracting executable) and I have different results! For example:
    Windows 5700MB -> compressed to 3970MB
    Linux 5700MB -> compressed to 4080MB

    Windows 1000MB -> compressed to 667MB
    Linux 1000MB -> compressed to 697MB

    Is it CPU-dependent? When I buy Intel Sandy i7 2600k my compression results will be better?

  2. #2
    Member m^2's Avatar
    Join Date
    Sep 2008
    Location
    Ślůnsk, PL
    Posts
    1,611
    Thanks
    30
    Thanked 65 Times in 47 Posts
    FreeArc memory usage depends on how much of it your system has.
    Also, there might be some multithreading related differences, more cores = weaker with the same settings.

  3. #3
    Programmer Bulat Ziganshin's Avatar
    Join Date
    Mar 2007
    Location
    Uzbekistan
    Posts
    4,532
    Thanks
    755
    Thanked 674 Times in 365 Posts
    in ultra compression, you deal with lzma 2-threaded code. it doesn't have stable compression due to threading issues

  4. #4
    Member
    Join Date
    Jul 2011
    Location
    Amsterdam
    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Thanks for replies. It's more clear now.

Similar Threads

  1. FreeArc
    By Bulat Ziganshin in forum Data Compression
    Replies: 3160
    Last Post: 26th September 2019, 20:51
  2. Compiler related: Intel's code slower on AMD-CPUs?!
    By Vacon in forum Data Compression
    Replies: 5
    Last Post: 10th May 2008, 18:56
  3. FreeArc 0.40 released
    By Bulat Ziganshin in forum Forum Archive
    Replies: 301
    Last Post: 28th April 2008, 13:27
  4. Strange gcc4.3 results with paq8o8
    By Hahobas in forum Forum Archive
    Replies: 8
    Last Post: 22nd March 2008, 20:44
  5. TC 5.1dev7x test results
    By LovePimple in forum Forum Archive
    Replies: 8
    Last Post: 23rd January 2007, 23:00

Posting Permissions

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