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Thread: QUAD 1.10 has been released!

  1. #1
    The Founder encode's Avatar
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    What's new:
    + Slightly higher compression with Max mode (Thanks to Uwe Herklotz)
    + Faster decompression (Thanks to Christian Martelock)
    + Added a new "-f" switch (force overwrite)
    + Some source changes

    Enjoy!

    quad.sourceforge.net


  2. #2
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    Awesome! Thanks Ilia!

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    Programmer Bulat Ziganshin's Avatar
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    my results of comparision with lzma: on executable quad was significantly worse. on text files it was comparable, so i made deeper tests with texts preprocessed by my dict preprocessor (because on these files it improves compression of both lzma and quad)

    quad:normal always slower than lzma:fast and always compress better. speed difference is 1.5-2x

    quad:max is a bit slower that lzma:ultra and sometimes compress better, sometimes worser. of my 7 test files, 3 are concatenated htmls and quad was better just on these files. on one file (russian books) it was equal to lzma, other files (sources) lzma was better

    in cases where quad has better max compression than lzma, its default compression is better in terms of speed/ratio than lower lzma settings

    so, i can propose
    - OP to beat lzma unconditionally
    - settable memory usage option to beat 7z using tons of memory
    - some speed optimization (?) to work as fast as 7z in fast mode
    - local compression tricks from lzma which makes it so beatiful for executables

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    The Founder encode's Avatar
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    Okay, what's next:

    + Some speed optimizations with Normal mode, probably, in addition to slightly higher compression
    + Finally add the truly Optimal Parsing

    Just a few notes about QUAD's modes and speed. The Normal mode is intended for every day use and represents something efficient - that's why I will inrease speed (and probably slightly compression). The Max mode is about max compression at any cost (Of course, with the same decompressor - thus decompression time and memory usage will be the same). The max mode with some optimizations can work much faster, however, currently I'll keep all eyes on compression ratio of Max mode and compression speed of Normal mode.


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    Programmer Bulat Ziganshin's Avatar
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    today's hard compression users often ignore "normal" settings and use only "maximum" ones. then they wonder why 7z/uharc/... is so slow

    anyway, i mean speed otimizations for normal mode where you already outperform lzma:fast by comperssion and it will be great to outperform by speed. while for max mode OP is most important goal

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    Tested 1.10:
    Small gains on all tests and 38% decompression speed increase.
    http://uclc.info/

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    Quote Originally Posted by Bulat Ziganshin
    then they wonder why 7z/uharc/... is so slow
    On my laptop is 7z Ultra (-mx9) is all but slow
    2162.3 KB/s compression speed.
    48609.4 KB/s decompression speed.

    Fast enough for me

  8. #8
    Programmer Bulat Ziganshin's Avatar
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    too fast! are you drinking with 7z?

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    Quote Originally Posted by JohanDeBock
    Tested 1.10:
    Small gains on all tests and 38% decompression speed increase.
    http://uclc.info/
    Thank you, Johan!

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    Why did you not keep old versions on sourceforge ?

  11. #11
    The Founder encode's Avatar
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    Quote Originally Posted by Mike
    Why did you not keep old versions on sourceforge ?
    Each new version is significantly better than older one - currently Im working 24/7 on QUAD. Its just to forget the past...

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