Code: Select all
Ponder ON vs OFF 5s+0.05s:
Score of Komodo vs Komodo: 836 - 174 - 990 [0.665] 2000
ELO difference: 119.50 +/- 10.74
Score of Komodo vs Komodo: 813 - 202 - 985 [0.653] 2000
ELO difference: 109.64 +/- 10.80
Finished match
Ponder OFF 10s+0.1 vs 5s+0.05s:
Score of Komodo vs Komodo: 942 - 125 - 933 [0.704] 2000
ELO difference: 150.72 +/- 11.06
Score of Komodo vs Komodo: 935 - 133 - 932 [0.701] 2000
ELO difference: 147.60 +/- 11.07
http://www.talkchess.com/forum/viewtopic.php?t=62146
Effective Speed-Up = 1 / (1 - 0.955 + 0.955/n_cores)
This gives speedups of:
2 --> 4 cores: 1.84
4 --> 8 cores: 1.73
8 --> 16 cores: 1.57
16 --> 32 cores: 1.40
32 --> 64 cores: 1.25
Therefore 4 --> 8 cores is almost even with Ponder ON 4 cores each, and anything above, say 6 --> 12 , 8 --> 16 is better played Ponder ON on half cores than Ponder OFF on full number of cores. In the TCEC case, the improvement from Ponder ON is substantial over doubling number of cores Ponder OFF (1.71 compared to 1.40 or 1.25). Also, worth noting than the Ponder hit rate only increases going to LTC and more cores, therefore the benefit of Ponder ON.