Windows x64 for Haswell CPUsWindows x64 for modern computersWindows x64Windows 32Linux x64 for Haswell CPUsLinux x64 for modern computersLinux x64Author: Joona Kiiski
Date: Mon Feb 16 20:36:13 2015 +0000
Timestamp: 1424118973
Improve smp performance for high number of threads
Balance threads between split points.
There are huge differences between different machines and autopurging makes it very difficult to measure the improvement in fishtest, but the following was recorded for 16 threads at 15+0.05:
For Bravone (1000 games): 0 ELO
For Glinscott (1000 games): +20 ELO
For bKingUs (1000 games): +50 ELO
For fastGM (1500 games): +50 ELO
The change was regression for no one, and a big improvement for some, so it should be fine to commit it.
Also for 8 threads at 15+0.05 we measured a statistically significant improvement:
ELO: 6.19 +-3.9 (95%) LOS: 99.9%
Total: 10325 W: 1824 L: 1640 D: 6861
Finally it was verified that there was no (significant) regression for
4 threads:
ELO: 0.09 +-2.8 (95%) LOS: 52.4%
Total: 19908 W: 3422 L: 3417 D: 13069
2 threads:
ELO: 0.38 +-3.0 (95%) LOS: 60.0%
Total: 19044 W: 3480 L: 3459 D: 12105
1 thread:
ELO: -1.27 +-2.1 (95%) LOS: 12.3%
Total: 40000 W: 7829 L: 7975 D: 24196
Resolves #258
http://abrok.eu/stockfish/
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