Stockfish 8 with and without Contempt Factor under Windows & Linux
Windows: Windows 10 Professional 64-Bit, Dual AMD Opteron 6376 @ 2.3 GHz
Linux: Ubuntu Server 16.04 LTS (HVM) 64-Bit, Amazon EC2 Instance, m4.16xlarge, Intel Xeon E5-2686v4 @ 2.3 GHz
Stockfish: default settings, except Contempt, 128 MB Hash
Cutechess-Cli: no draw and resign rules, no ponder, no learning, no tablebases, 1500 diff. opening positions, changing colors
TC = time control, T = number of threads, Depth = Average search depth, Elostat Start Elo = 3000
Here the results, also as PDF-File:
http://www.fastgm.de/schach/SMP-scaling-SF8-C10.pdf
Code: Select all
Windows – 1 thread vs 2 threads
TC = 60" + 0.05" – default Contempt = 0 Contempt = 10
Program Elo + - Games Score Draws Depth Program Elo + - Games Score Draws Depth
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1 Stockfish 8 T2 : 3031 6 6 3000 58.7 % 73.7 % 21.59 1 Stockfish 8 T2 : 3035 6 6 3000 60.0 % 71.3 % 21.90
2 Stockfish 8 T1 : 2969 6 6 3000 41.3 % 73.7 % 20.33 2 Stockfish 8 T1 : 2965 6 6 3000 40.0 % 71.3 % 20.51
Result : 1761.0/3000 (+655,=2212,-133) Result : 1800.0/3000 (+731,=2138,-131)
Perf. : 58.7 % Perf. : 60.0 %
Elo : 3061 Elo : 3070 +9 Elo
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Linux – 1 thread vs 2 threads
TC = 10" + 0.1" – default Contempt = 0 Contempt = 10
Program Elo + - Games Score Draws Depth Program Elo + - Games Score Draws Depth
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1 Stockfish 8 T2 : 3039 7 7 3000 61.0 % 68.1 % 19.84 1 Stockfish 8 T2 : 3043 7 7 3000 62.0 % 63.0 % 20.56
2 Stockfish 8 T1 : 2961 7 7 3000 39.0 % 68.1 % 18.73 2 Stockfish 8 T1 : 2957 7 7 3000 38.0 % 63.0 % 19.39
Result : 1830.0/3000 (+809,=2042,-149) Result : 1860.0/3000 (+915,=1890,-195)
Perf. : 61.0 % Perf. : 62.0 %
Elo : 3078 Elo : 3085 +8 Elo
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Windows – 1 thread vs 4 threads
TC = 60" + 0.05" – default Contempt = 0 Contempt = 10
Program Elo + - Games Score Draws Depth Program Elo + - Games Score Draws Depth
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1 Stockfish 8 T4 : 3056 7 7 3000 65.6 % 65.7 % 23.08 1 Stockfish 8 T4 : 3062 7 7 3000 67.2 % 62.1 % 23.21
2 Stockfish 8 T1 : 2944 7 7 3000 34.4 % 65.7 % 20.66 2 Stockfish 8 T1 : 2938 7 7 3000 32.8 % 62.1 % 20.69
Result : 1968.0/3000 (+982,=1972,-46) Result : 2015.5/3000 (+1084,=1863,-53)
Perf. : 65.6 % Perf. : 67.2 %
Elo : 3112 Elo : 3124 +12 Elo
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Linux – 1 thread vs 4 threads
TC = 10" + 0.1" – default Contempt = 0 Contempt = 10
Program Elo + - Games Score Draws Depth Program Elo + - Games Score Draws Depth
------------------------------------------------------------------- -------------------------------------------------------------------
1 Stockfish 8 T4 : 3064 7 7 3000 67.6 % 61.2 % 21.41 1 Stockfish 8 T4 : 3074 8 8 3000 70.1 % 56.0 % 22.20
2 Stockfish 8 T1 : 2936 7 7 3000 32.4 % 61.2 % 19.39 2 Stockfish 8 T1 : 2926 8 8 3000 29.9 % 56.0 % 19.97
Result : 2028.5/3000 (+1111,=1835,-54) Result : 2104.0/3000 (+1264,=1680,-56)
Perf. : 67.6 % Perf. : 70.1 %
Elo : 3128 Elo : 3148 +20 Elo
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Windows – 1 thread vs 8 threads
TC = 60" + 0.05" – default Contempt = 0 Contempt = 10
Program Elo + - Games Score Draws Depth Program Elo + - Games Score Draws Depth
------------------------------------------------------------------- -------------------------------------------------------------------
1 Stockfish 8 T8 : 3079 8 8 3000 71.2 % 56.4 % 23.87 1 Stockfish 8 T8 : 3090 8 8 3000 73.8 % 50.7 % 24.25
2 Stockfish 8 T1 : 2921 8 8 3000 28.8 % 56.4 % 20.40 2 Stockfish 8 T1 : 2910 8 8 3000 26.2 % 50.7 % 20.42
Result : 2135.5/3000 (+1289,=1693,-18) Result : 2215.0/3000 (+1454,=1522,-24)
Perf. : 71.2 % Perf. : 73.8 %
Elo : 3157 Elo : 3180 +23 Elo
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Linux – 1 thread vs 8 threads
TC = 10" + 0.1" – default Contempt = 0 Contempt = 10
Program Elo + - Games Score Draws Depth Program Elo + - Games Score Draws Depth
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1 Stockfish 8 T8 : 3093 8 8 3000 74.4 % 50.4 % 22.35 1 Stockfish 8 T8 : 3101 9 9 3000 76.2 % 45.6 % 23.22
2 Stockfish 8 T1 : 2907 8 8 3000 25.6 % 50.4 % 19.38 2 Stockfish 8 T1 : 2899 9 9 3000 23.8 % 45.6 % 20.09
Result : 2232.5/3000 (+1477,=1511,-12) Result : 2285.5/3000 (+1601,=1369,-30)
Perf. : 74.4 % Perf. : 76.2 %
Elo : 3185 Elo : 3202 +17 Elo
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Linux – 1 thread vs 16 threads
TC = 10" + 0.1" – default Contempt = 0 Contempt = 10
Program Elo + - Games Score Draws Depth Program Elo + - Games Score Draws Depth
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1 Stockfish 8 T16 : 3113 13 13 1516 78.7 % 42.0 % 23.33 1 Stockfish 8 T16 : 3123 10 10 3000 80.4 % 38.5 % 23.96
2 Stockfish 8 T1 : 2887 13 13 1516 21.3 % 42.0 % 19.33 2 Stockfish 8 T1 : 2877 10 10 3000 19.6 % 38.5 % 19.89
Result : 1192.5/1516 (+874,=637,-5) Result : 2411.5/3000 (+1834,=1155,-11)
Perf. : 78.7 % Perf. : 80.4 %
Elo : 3227 Elo : 3245 +18 Elo
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Linux – 1 thread vs 32 threads
TC = 10" + 0.1" – default Contempt = 0 Contempt = 10
Program Elo + - Games Score Draws Depth Program Elo + - Games Score Draws Depth
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1 Stockfish 8 T32 : 3115 13 13 1502 79.0 % 41.5 % 23.03 1 Stockfish 8 T32 : 3130 15 14 1510 81.7 % 36.0 % 23.89
2 Stockfish 8 T1 : 2885 13 13 1502 21.0 % 41.5 % 19.45 2 Stockfish 8 T1 : 2870 14 15 1510 18.3 % 36.0 % 20.07
Result : 1186.0/1502 (+874,=624,-4) Result : 1234.0/1510 (+962,=544,-4)
Perf. : 79.0 % Perf. : 81.7 %
Elo : 3230 Elo : 3260 +30 Elo