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3.7
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@bagaturchess bagaturchess released this 06 Feb 18:29
· 459 commits to master since this release
v3.7
ce88b64
  • SMP version:
    1. On https://tcec-chess.com/ S24, there is still NPS scaling issue, because the achieved value is 5-10M nps and the expected is 30M nps.
    1. The issue is reproducible on CentOS Stream release 8 and Java OpenJDK 1.8.0.
    1. The tests show that with up to 64 cores (128 logical processors) it still achieves more stable and deeper depth, for a fixed time, with only 1 Transposition Table, although the NPS is between 3 and 6 times smaller.
    1. A new UCI option is introduced for SMP version - CountTranspositionTables.
    1. On CentOS Stream release 8 and Java OpenJDK 1.8.0, with 8 Transposition Tables the SMP search achieves similar depth and time, so there is sense to set it not to be 1, only when there is a NPS scaling issue. In such cases it could be set up to SQRT(THREADS_COUNT) Transposition Tables.
    1. More details about the tests of the SMP version, could be found here: https://github.com/bagaturchess/Bagatur/tree/master/Sources/Search#readme
    1. Bug fixing and optimizations inside the bagaturchess.search.impl.rootsearch.parallel.SearchersInfo class.
    1. SMP version: Code clean up and simplification
  • Single Core version
    1. Randomize the non-attacking moves, before moves' ordering and sorting, in order to benefit from the search's undeterminism and minimize error.
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