lila-tablebase benchmark suite and results

For Lichess's tablebase server lila-tablebase.

Also see https://lichess.org/@/revoof/blog/optimizing-the-tablebase-server/MetV0ZQd

Run benchmarks

unzstd fens.txt.zst
RAYON_NUM_THREADS=12 cargo run --release -- fens.txt | tee results.tsv

fens.txt

1 million tablebase requests recorded in production. Sample:

1Q6/3kr3/8/3K4/8/8/8/8 b - - 1 1
8/3k4/3B4/3BK3/8/8/8/8 w - - 26 14
8/8/3k1Q2/8/8/3NK3/8/8 b - - 1 1
8/8/8/8/8/2K5/8/3k4 w - - 0 13
8/8/2Pr3k/p3P3/8/8/2K1B3/8 w - - 0 1

results

FEN, tab, response time in milliseconds. Sample:

8/1R4k1/r7/5KPP/8/8/8/8 b - - 2 55	0
8/1R3k1p/5b2/4pK2/4P3/7P/8/8 b - - 5 57	0
8/2K5/3P4/2k2b2/8/8/6B1/8 w - - 20 11	1
8/8/4k3/4Pn1p/8/1K6/8/q7 w - - 0 42	0

• pread/mmap/parallel-pread: I/O method as described in blog
• normal/random: PPOSIX_FADV_NORMAL/POSIX_FADV_RANDOM or equivalent
• no-prefix/hot-prefix/hot-prefix2: Unused SSD, RAID 1 with many table prefixes, RAID 0 with all table prefixes

License

CC0