Monday, December 24, 2007

7-Zip 4.58 alpha 1 for Windows 32 bit and x64 by Igor Pavlov

7-Zip 4.58 alpha 1 was released.

7-Zip for 32-bit Windows:

What's new:
- Small improvements in ZIP/Deflate compression.
- 7-Zip was compiled by new version of C++ compiler.

7-Zip 4.58 alpha was compiled by VC++ compiler from Windows Driver Kit (WDK). Some codecs now are faster and some codecs are slower. I need more information about the performance of new version. If the performance is poor, I can go back to old compiler (VC++ 6).

You can post some benchmark results here for 7-Zip 4.57 / 4.58. Just call:
7z b > res.txt
Write also some information about your CPU: CPU Type/Frequency.

Also you can compare another codecs (Bzip2/PPMD/Deflate/AES) using timer program:
To exclude HDD reading time from results you can run 7-zip two or more times with same file.

Note also that compression speed for Zip/Deflate in Ultra mode was improved in 7-zip 4.58. So it is faster than 4.57 by another reason.

Another question is compatibility with Windows 9x/ME and NT4.
If you have any compatibility problems, write here about them and write also information about msvcrt.dll in you system folder (version number and timestamp).


Win x64:

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