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2016-02-04 10:02

ChristopherJam

Registered: Aug 2004
Posts: 1409

Nucrunch 0.1

Continuing from the benchmarks WVL posted in Doynamite 1.x:

I dusted off my unfinished nucrunch in December to pack just enough of the second page of Reutastic to give me some workspace for some precalculations. Pity I didn't schedule enough time to pack the entire demo, else it would have been ~90 blocks instead of 190, but I digress. I've spent bits of the past month cleaning up the code, optimizing the packer (mostly by porting it from python to rust :P), and adding reverse direction support.

It's still no more than a component, with an commandline packer and asm decrunch subroutine, but no tools yet for generating an executable from a single commandline. It does at least now support multiple input segments that are unpacked to their destination addresses, and it's also now useable enough to for me to do some benchmarking.

In short, doynamite's ratio looks pretty unbeatable for anything lz based; my ratio's almost identical despite a somewhat different encoding.

Where I can win though is speed at that ratio; nucrunch is usually ten to twenty percent faster. The one exception in the test corpus is 6.bin, where it's 20% slower; not sure why yet.

I've added the times for pucrunch -ffast below for to complete the comparison. Last two columns are nucrunch, and nucrunch -r (the latter decodes in reverse; should be a more useful component for single filers)

If anyone wants to have a play at this stage, poke me and I'll upload some source. Failing that I'll hold off until I at least have something that can make onefilers without any faffing about with relocating the last couple of pages by hand.

filesizes
#   bin   rle wvl-f wvl-s    tc    bb  pu-f doyna nucru rnucr
- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
1 11008  8020  4529  4151  4329  3383  3711  3265  3225  3230
2  4973  4314  3532  3309  3423  2648  3005  2512  2498  2490
3  3949  3498  2991  2617  2972  2187  2530  2108  2091  2093
4  7016  6456  4242  4085  4225  3681  3924  3617  3622  3614
5 34760 27647 25781 24895 25210 21306 21182 20405 20447 20516
6 31605 12511 11283 10923 11614  9194  9203  8904  8915  8894
7 20392 17295 12108 11285 11445  9627  9789  9289  9140  9144
8  5713  5407  4179  3916  3936  3251  3656  3132  3165  3187
9  8960  7986  6914  6896  6572  5586  6000  5430  5502  5486

filesize in %
#   bin   rle wvl-f wvl-s    tc    bb  pu-f doyna nucru rnucr
- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
1   100  72.9  41.1  37.7  39.3  30.7  33.7  29.7  29.3  29.3
2   100  86.7  71.0  66.5  68.8  53.2  60.4  50.5  50.2  50.1
3   100  88.6  75.7  66.3  75.3  55.4  64.1  53.4  53.0  53.0
4   100  92.0  60.5  58.2  60.2  52.5  55.9  51.6  51.6  51.5
5   100  79.5  74.2  71.6  72.5  61.3  60.9  58.7  58.8  59.0
6   100  39.6  35.7  34.6  36.7  29.1  29.1  28.2  28.2  28.1
7   100  84.8  59.4  55.3  56.1  47.2  48.0  45.6  44.8  44.8
8   100  94.6  73.1  68.5  68.9  56.9  64.0  54.8  55.4  55.8
9   100  89.1  77.2  77.0  73.3  62.3  67.0  60.6  61.4  61.2

number of frames to depack
#   bin   rle wvl-f wvl-s    tc    bb  pu-f doyna nucru rnucr
- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
1     0    11    13    14    15    58    54    27    22    22
2     0     5     7     7     9    38    39    17    14    14
3     0     4     6     6     7    28    31    12    10    10
4     0     8     9     9    10    43    51    20    17    18
5     0    36    39    42    59   300   298   119   104   107
6     0    20    25    25    37   126   152    49    59    59
7     0    22    25    26    32   138   139    60    51    52
8     0     6     8     8    10    43    47    18    16    17
9     0     9    12    12    16    73    81    32    28    29

kilobytes output per second
#   bin   rle wvl-f wvl-s    tc    bb  pu-f doyna nucru rnucr
- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
1        49.0  41.4  38.5  35.9   9.3  10.0  20.0  24.5  24.5
2        48.7  34.8  34.8  27.0   6.4   6.2  14.3  17.4  17.4
3        48.3  32.2  32.2  27.6   6.9   6.2  16.1  19.3  19.3
4        42.9  38.2  38.2  34.3   8.0   6.7  17.2  20.2  19.1
5        47.3  43.6  40.5  28.8   5.7   5.7  14.3  16.4  15.9
6        77.4  61.9  61.9  41.8  12.3  10.2  31.6  26.2  26.2
7        45.4  39.9  38.4  31.2   7.2   7.2  16.6  19.6  19.2
8        46.6  35.0  35.0  28.0   6.5   6.0  15.5  17.5  16.5
9        48.7  36.5  36.5  27.4   6.0   5.4  13.7  15.7  15.1

cycles per byte consumed
#   bin   rle wvl-f wvl-s    tc    bb  pu-f doyna nucru rnucr
- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
1     0    27    56    66    68   337   286   163   134   134
2     0    23    39    42    52   282   255   133   110   111
3     0    22    39    45    46   252   241   112    94    94
4     0    24    42    43    47   230   255   109    92    98
5     0    26    30    33    46   277   277   115   100   103
6     0    31    44    45    63   269   325   108   130   130
7     0    25    41    45    55   282   279   127   110   112
8     0    22    38    40    50   260   253   113    99   105
9     0    22    34    34    48   257   265   116   100   104

decrunch time for nucrunch/rnucrunch relative to doynamite
1:  81.5% (-18.5%)  81.5% (-18.5%)
2:  82.4% (-17.6%)  82.4% (-17.6%)
3:  83.3% (-16.7%)  83.3% (-16.7%)
4:  85.0% (-15.0%)  90.0% (-10.0%)
5:  87.4% (-12.6%)  89.9% (-10.1%)
6: 120.4% ( 20.4%) 120.4% ( 20.4%)
7:  85.0% (-15.0%)  86.7% (-13.3%)
8:  88.9% (-11.1%)  94.4% ( -5.6%)
9:  87.5% (-12.5%)  90.6% ( -9.4%)

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2016-03-09 13:16

ChristopherJam

Registered: Aug 2004
Posts: 1409

Fair point!

2016-03-09 13:19

Bitbreaker

Registered: Oct 2002
Posts: 508

For now, i decided to add the check back in, that ends decrunching after a 257 byte match is decoded. This decreases speed slightly, but i have made other optimizations to compensate for more than that.

2024-09-16 17:33

Martin Piper

Registered: Nov 2007
Posts: 726

LZMPi with -cu option:
https://github.com/martinpiper/C64Public/tree/master/bin

bytes
1 3,143
2 2,372
3 1,912
4 3,524
5 19,036
6 8,147
7 8,809
8 2,912
9 5,207

2024-09-17 16:14

ChristopherJam

Registered: Aug 2004
Posts: 1409

Oh, thanks for posting those.

How many cycles to decrunch? (or, speed in bytes per second produced or consumed, I can work out the rest from there)

2024-09-18 03:33

Martin Piper

Registered: Nov 2007
Posts: 726

| file | cycles |
| 1.bin | 420115 |
| 2.bin | 264355 |
| 3.bin | 199139 |
| 4.bin | 311702 |
| 5.bin | 1930613 |
| 6.bin | 1063796 |
| 7.bin | 954401 |
| 8.bin | 288310 |
| 9.bin | 515944 |

I've been porting this to the Amiga for a self extracting executable, so got around to testing the cycle times for this data: https://github.com/martinpiper/C64Public/blob/master/Decompress..

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