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Thread: Paq8pxd dict

  1. #691
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    I've run some tests with paq8pxd V73 and added the results to the table below.

    Tests run under Windows 7 64 bit, with i5-3570k CPU, and 8 GB RAM. Used SSE41 compiles of paq8pxd V*.

    Code:
    Compressor               Total file(s) size (bytes)    Compression time (seconds)    Compression options
    Original 171 jpg files         64,469,752
    paq8pxd v69                    51,365,725                          7,753                      -s9
    paq8pxd v72                    51,338,132                          7,533                      -s9
    paq8pxd v73                    51,311,533                          7,629                      -s9
    
    Tarred jpg files               64,605,696
    paq8pxd v69                    50,571,934                          7,897                      -s9
    paq8pxd v72                    50,552,930                          7,756                      -s9
    paq8pxd v73                    50,530,038                          7,521                      -s9
    Overall, improved compression, and slight reduction in compression time for v73!

  2. Thanks (2):

    Darek (Today),kaitz (Today)

  3. #692
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    Scores on my testset for paq8pxd_v73 - very nice improvements overall - especially for K.WAD file. In total 25KB of gain.
    Option -x (second table) gives additional 16KB of gain to -s test -> the gains are visible almost for every file.
    Time penalty for -x option compared to -s is about 21%.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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Name:	paq8pxd_v73_x.jpg 
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ID:	7419  

  4. Thanks:

    kaitz (Today)

  5. #693
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    Quote Originally Posted by brispuss View Post
    Overall, improved compression, and slight reduction in compression time for v73!
    In single mode there is file overhead about 50 bytes per file vs px version. Like when you compress 1 byte file.
    For this single mode test i think its about 9000 bytes total. Not sure how much overhead is on tarred file, probably 100 bytes total for input data. (data that cant be compressed)
    KZo


  6. #694
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    @kaitz - I have question - is there -x option works for -x15 option? I've tested enwik8 files and scores for -s15 and -x15 are identical. Timings are also similar.
    For my testset, for textual files there are difference between -s9 and -x9 options.

    From other side scores are great:

    16'013'638 - enwik8 -s15 by Paq8pxd_v72_AVX2
    16'672'036 - enwik8.drt -s15 by Paq8pxd_v72_AVX2

    15'993'409 - enwik8 -s15 by Paq8pxd_v73_AVX2
    15'956'537 - enwik8.drt -s15 by Paq8pxd_v73_AVX2

  7. #695
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    My bad, level 10 and up will be in -s mode.
    KZo


  8. #696
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    From one side that's good news -> if you could change this then scores for enwik8 could be even better!

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