7-Zip 9.30 alpha

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  • PIK

    PIK - 2012-12-24

    9.22beta x64 equally

  • Igor Pavlov

    Igor Pavlov - 2012-12-24

    try 32 MB or 16 MB dictionary.

  • Igor Pavlov

    Igor Pavlov - 2012-12-24

    256 MB file set is too small for 64 MB dictionary multithreading.

  • PIK

    PIK - 2012-12-24

    Yeah, my mistake. It was "Maximum". With "Normal" 18s compress, 2s decompress and 49MB archive. Its ok.


  • Igor Pavlov

    Igor Pavlov - 2012-12-24

    Try also with LZMA2:
    1) "Fastest"
    2) "Fast"
    4) "Fast" with 4 MB dictionary
    Is it faster than WinRAR?

  • PIK

    PIK - 2012-12-24

    Well... Simply faster is not a question. Or problem. "Normal" ist ok. Also with 64 word. No problem.

    But I wishes, 4 threads which a "very little" more faster. Its Christmas ;-)
    2 threads respectively lzma is fast enough.

    Hey Igor we need a Final for outside volks. Realy... For 7-zip PR its to long ago :-\

  • PIK

    PIK - 2012-12-25

    With I mean:
    I choose today lzma2 und Normal (default) to archive my copys of thunerbird dir, and profile of Thunderbird and few another dirs.
    Make 183.136.094 Bytes.

    winrar make a 105.205.253 Bytes archive. 7-zip a 102.226.274 Bytes.

    Great for those free multiformat soft. With for me more reasonable GUIs.

    But on my 8GB, 4.3Ghz 2500k (4 cores, 4 Threads) and Win7 x64 system, winrar (4.20 x64) need to archive near 8 seconds. 9.30 x64 near 18 seconds.

    Not a drama for those great free soft, but I mean, in the most real cases we have lately a... little bit... lost a former trade-off of time/ratio in comparisons to winrar.

    I think comparison of time/ratio to winrar is not overstated and make sense. Its good to know where we break off.
    Then before 64 bit and 4 threads, 7-zip did not have dread of any such challenges.

    Sorry for my english.

  • Igor Pavlov

    Igor Pavlov - 2012-12-25

    Can you test also "Fast" and "Fast" with 4 MB dictionary?
    Maybe some of these modes is faster than WinRAR / Normal and provides better compression ratio.

  • PIK

    PIK - 2012-12-27

    Is the handling of passwords in 7-zip pbkdf2? sha, sha256? With how much iterations? Or bcrypt or scrypt?

    • Igor Pavlov

      Igor Pavlov - 2012-12-27

      1) for ZIP-AES archives: it uses WinZip-AES (Pbkdf2 / Sha1)
      2) for 7z archives: 512K iterations of SHA256:

  • szfong

    szfong - 2013-01-20

    I seem to get best compression when using single threads/CPU, and I'm wondering if I create archives using single threads, will un-archiving *.7z files created using single threads on a multi-core CPU also force 7-Zip to only utilize a single core/thread?


  • Igor Pavlov

    Igor Pavlov - 2013-01-20

    7-Zip uses single thread for decompression of 7z archives.
    But it can use some minor additional threads for filters or AES decryption.

  • Will

    Will - 2013-01-20


    You should get rid of the help file from the start menu.

    Why, you ask?

    See: http://msdn.microsoft.com/en-us/library/windows/desktop/aa511447.aspx#files

    Put only program shortcuts on the Start menu. Don't put shortcuts to the following items on the Start menu:

    Help files. Users access Help topics directly from your program.

    Nice guidelines to follow! :D



  • tim

    tim - 2013-01-22

    the www.7-zip.org site (hosted on sourceforge.net) seams to have been wiped.!. there is nothing there.

  • John Zhang

    John Zhang - 2013-01-23

    9.30 not support split Zip file of winzip too.We still need winzip to extract file like .z01.

    • Jiri Palecek

      Jiri Palecek - 2013-02-19

      There is a patch in the patch tracker (click on Tickets) that implements reading split .zip files.

  • FC117

    FC117 - 2013-02-14

    is 7z new versions has solved duplicate file problems?

  • Rainforce

    Rainforce - 2013-02-19

    Wow. Didn't know that You have updated...umm, file archiver.

  • grml4d

    grml4d - 2013-03-01

    despite the answer about gzip . 7zip and gzip are not handling well big size files ;']
    these days i made several install of win7 ultimate in a vhd file for a dual cpu . i make the choice of win7 mostly for network reason : win8 does not handle some direct cache transfers that win 7 does with the correct hardware...
    so after install , i found that best size for the vhd is above 12 Go and i have set it at 16 Go . 16 Go being also the amount of ram of the mainboard .
    my win7 has the firadisk driver that can handle files loaded by grub4dos in ram . grub4dos also handle gziped images or vhds .
    i first made a gz file out of my 16 Go vhd using gzip but grub4dos said it cannot load it . so i used easeus and win7 to reduce the size of the vhd . first i compressed the ntfs partition , then shrinked and made a copy of it in a new file .
    i gziped with gzip and 7zip : the first did it in half an hour at -9 while 7 z took 5 hours at ultra .
    i uploaded an image that shows all files : http://postimage.org/image/i40czyhd3/
    on the left the 16 Go and its gz . below the gz opened by gzip that shows a size of 512 and a packed of 6.5 Go
    on the right the new reduced vhd called w7x88.vhd , gziped name are not same because i did not wanted to reedit the gru4dos menu file .
    gzip or 7zip are both giving a size 3.624.927.744 , so does grub4dos too : http://postimage.org/image/6q98b0hgn/

    i tried the reduced vhd no gziped and it booted well : http://postimage.org/image/9vtu1802v/

  • thexfile

    thexfile - 2013-03-21

    What's the status of 9.30a 7zip..is it dead?

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