Marlin :
loading : R:\tunstall_test\lzt24.literals
filelen = 1111673
H = 7.452694
sym_count = 256
lzt24.literals : 1,111,673 -> 1,286,166 = 9.256 bpb = 0.864 to 1
decode_time2 : seconds:0.0022 ticks per: 3.467 b/kc : 288.41 MB/s : 498.66
loading : R:\tunstall_test\monarch.tga.rrz_filtered.bmp
filelen = 1572918
H = 2.917293
sym_count = 236
monarch.tga.rrz_filtered.bmp: 1,572,918 -> 618,447 = 3.145 bpb = 2.543 to 1
decode_time2 : seconds:0.0012 ticks per: 1.281 b/kc : 780.92 MB/s : 1350.21
loading : R:\tunstall_test\paper1
filelen = 53161
H = 4.982983
sym_count = 95
paper1 : 53,161 -> 35,763 = 5.382 bpb = 1.486 to 1
decode_time2 : seconds:0.0001 ticks per: 1.988 b/kc : 503.06 MB/s : 869.78
loading : R:\tunstall_test\PIC
filelen = 513216
H = 1.210176
sym_count = 159
PIC : 513,216 -> 140,391 = 2.188 bpb = 3.656 to 1
decode_time2 : seconds:0.0002 ticks per: 0.800 b/kc : 1250.71 MB/s : 2162.48
loading : R:\tunstall_test\tabdir.tab
filelen = 190428
H = 2.284979
sym_count = 77
tabdir.tab : 190,428 -> 68,511 = 2.878 bpb = 2.780 to 1
decode_time2 : seconds:0.0001 ticks per: 1.031 b/kc : 969.81 MB/s : 1676.80
total bytes out : 1974785
naive plural Tunstall :
loading : R:\tunstall_test\lzt24.literals
filelen = 1111673
H = 7.452694
sym_count = 256
lzt24.literals : 1,111,673 -> 1,290,015 = 9.283 bpb = 0.862 to 1
decode_time2 : seconds:0.0022 ticks per: 3.443 b/kc : 290.45 MB/s : 502.18
loading : R:\tunstall_test\monarch.tga.rrz_filtered.bmp
filelen = 1572918
H = 2.917293
sym_count = 236
monarch.tga.rrz_filtered.bmp: 1,572,918 -> 627,747 = 3.193 bpb = 2.506 to 1
decode_time2 : seconds:0.0012 ticks per: 1.284 b/kc : 779.08 MB/s : 1347.03
loading : R:\tunstall_test\paper1
filelen = 53161
H = 4.982983
sym_count = 95
paper1 : 53,161 -> 35,934 = 5.408 bpb = 1.479 to 1
decode_time2 : seconds:0.0001 ticks per: 1.998 b/kc : 500.61 MB/s : 865.56
loading : R:\tunstall_test\PIC
filelen = 513216
H = 1.210176
sym_count = 159
PIC : 513,216 -> 145,980 = 2.276 bpb = 3.516 to 1
decode_time2 : seconds:0.0002 ticks per: 0.826 b/kc : 1211.09 MB/s : 2093.97
loading : R:\tunstall_test\tabdir.tab
filelen = 190428
H = 2.284979
sym_count = 77
tabdir.tab : 190,428 -> 74,169 = 3.116 bpb = 2.567 to 1
decode_time2 : seconds:0.0001 ticks per: 1.103 b/kc : 906.80 MB/s : 1567.86
total bytes out : 1995503
About the files :
lzt24.literals are the literals left over after LZ-parsing (LZQ1) lzt24
like all LZ literals they are high entropy and thus do terribly in Tunstall
monarch.tga.rrz_filtered.bmp is the image residual after filtering with my DPCM
(it actually has a BMP header on it which is giving Tunstall a harder time
than if I stripped the header)
paper1 & pic are standard
tabdir.tab is a text file of a dir listing with lots of tabs in it
For speed comparison, this is the Oodle Huffman on the same files :
loading file (0/5) : lzt24.literals
ooHuffman1 : ed...........................................................
ooHuffman1 : 1,111,673 -> 1,036,540 = 7.459 bpb = 1.072 to 1
encode : 8.405 millis, 13.07 c/b, rate= 132.26 mb/s
decode : 1.721 millis, 2.68 c/b, rate= 645.81 mb/s
ooHuffman1,1036540,8405444,1721363
loading file (1/5) : monarch.tga.rrz_filtered.bmp
ooHuffman1 : ed...........................................................
ooHuffman1 : 1,572,918 -> 586,839 = 2.985 bpb = 2.680 to 1
encode : 7.570 millis, 8.32 c/b, rate= 207.80 mb/s
decode : 2.348 millis, 2.58 c/b, rate= 669.94 mb/s
ooHuffman1,586839,7569562,2347859
loading file (2/5) : paper1
ooHuffman1 : 53,161 -> 33,427 = 5.030 bpb = 1.590 to 1
encode : 0.268 millis, 8.70 c/b, rate= 198.67 mb/s
decode : 0.080 millis, 2.60 c/b, rate= 665.07 mb/s
ooHuffman1,33427,267579,79933
loading file (3/5) : PIC
ooHuffman1 : 513,216 -> 106,994 = 1.668 bpb = 4.797 to 1
encode : 2.405 millis, 8.10 c/b, rate= 213.41 mb/s
decode : 0.758 millis, 2.55 c/b, rate= 677.32 mb/s
ooHuffman1,106994,2404854,757712
loading file (4/5) : tabdir.tab
ooHuffman1 : 190,428 -> 58,307 = 2.450 bpb = 3.266 to 1
encode : 0.926 millis, 8.41 c/b, rate= 205.70 mb/s
decode : 0.279 millis, 2.54 c/b, rate= 681.45 mb/s
ooHuffman1,58307,925742,279447
Tunstall is crazy fast. And of course that's a rather basic implementation of the decoder, I'm sure it could get faster.
Is there an application for plural Tunstall? I'm not sure. I tried it back in 2015 as an idea for literals in Mermaid/Selkie and abandoned it as not very relevant there. It works on low-entropy order-0 data (like image prediction residuals).
Of course if you wanted to test it against the state of the art you should consider SIMD Ryg RANS or GPU RANS. You should consider something like TANS with multiple symbols in the output table. You should consider merged-symbol codes, perhaps using escapes, perhaps runlen transforms. See for example "crblib/huffa.c" for a survey of Huffman ideas from 1996 (pre-runtransform, blocking MPS's, order-1-huff, multisymbol output, etc.)
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