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fishbuilder

Stockfish compilation optimisation tool

It's a genetic algorithm that selects compiler flags ; here are the results versus the standard build :

Engine Nodes/second
stockfish_gene 2296180.0 +- 17787.26
stockfish_base 2240525.0 +- 8060.88

Differences : 48329.0 +- 11991.0 Variance of the mean : 3461.5 ( 7.16 %) Speed up : 2.16 %

For the curious, here is the log of the 10 hour long genetic algorithm searching :

gen nevals avg std min max
0 80 2.1427e+06 61942.9 1.98496e+06 2.25507e+06
1 48 2.18633e+06 39955 2.07916e+06 2.27133e+06
2 39 2.21791e+06 28757 2.13467e+06 2.2868e+06
3 67 2.22677e+06 26266 2.16215e+06 2.29096e+06
4 52 2.24399e+06 25810.4 2.11052e+06 2.30564e+06
5 46 2.25497e+06 22220.2 2.18655e+06 2.3173e+06
6 37 2.26564e+06 21046.1 2.19608e+06 2.3173e+06
7 46 2.26501e+06 23533.6 2.19704e+06 2.3173e+06
8 44 2.26582e+06 25033.4 2.16494e+06 2.3173e+06
9 43 2.26658e+06 31425.1 2.07488e+06 2.29723e+06
10 51 2.25534e+06 41331.3 2.03713e+06 2.31305e+06
11 52 2.24033e+06 53506 2.01191e+06 2.31624e+06
12 58 2.25418e+06 28526.7 2.16867e+06 2.31624e+06
13 49 2.25808e+06 27323.6 2.16867e+06 2.32158e+06
14 53 2.25222e+06 41972.4 2.05374e+06 2.32158e+06
15 41 2.26364e+06 37065.6 2.09473e+06 2.32801e+06
16 53 2.24563e+06 66500.9 1.97098e+06 2.32801e+06
17 46 2.27418e+06 37863 2.07659e+06 2.32801e+06
18 48 2.25872e+06 57503.1 1.98183e+06 2.32801e+06
19 49 2.25597e+06 60615.1 2.0529e+06 2.32801e+06
20 52 2.24536e+06 65997.5 2.0396e+06 2.32801e+06
21 44 2.26852e+06 39503.7 2.08433e+06 2.33017e+06
22 53 2.25146e+06 53316.9 2.10876e+06 2.33017e+06
23 47 2.26317e+06 35696.7 2.12476e+06 2.33017e+06
24 39 2.24376e+06 72410.6 2.01836e+06 2.33017e+06
25 49 2.28877e+06 24930.5 2.20957e+06 2.33124e+06
26 47 2.28984e+06 19162.4 2.2057e+06 2.33124e+06
27 37 2.29416e+06 21662 2.23704e+06 2.33124e+06
28 49 2.27985e+06 41746 2.13196e+06 2.33448e+06
29 47 2.29446e+06 23827 2.21151e+06 2.33448e+06
30 47 2.27739e+06 50384.3 2.09212e+06 2.33448e+06
31 47 2.28591e+06 45503.5 2.08778e+06 2.33448e+06
32 42 2.2932e+06 36403.5 2.19608e+06 2.33448e+06
33 44 2.29355e+06 38319.5 2.14193e+06 2.33448e+06
34 53 2.29241e+06 30277.6 2.15476e+06 2.33448e+06
35 43 2.29278e+06 40626.2 2.12566e+06 2.33448e+06
36 57 2.2953e+06 24803.9 2.20473e+06 2.33448e+06
37 49 2.26904e+06 64312.2 2.07574e+06 2.33448e+06
38 53 2.28056e+06 44706.6 2.11851e+06 2.33448e+06
39 42 2.28306e+06 47772.4 2.02811e+06 2.33448e+06
40 46 2.28564e+06 42651.1 2.06722e+06 2.33448e+06

Also, here are the optimisation flags found (in addition to -O3), all done with gcc 7.2.0, on an Intel 6700 processor :

-fmodulo-sched -fmodulo-sched-allow-regmoves -fgcse-lm -fgcse-sm -faggressive-loop-optimizations -fdeclone-ctor-dtor -fdevirtualize-speculatively -fdevirtualize-at-ltrans -flifetime-dse=2 -flive-range-shrinkage -fira-region=one -fira-loop-pressure -fno-ira-share-save-slots -fsched-pressure -fsched-spec-load -fsched-spec-load-dangerous -fsched-stalled-insns-dep=0 -freschedule-modulo-scheduled-loops -fipa-pta -fgraphite-identity -floop-nest-optimize -ftree-loop-vectorize -fvect-cost-model=cheap -fsimd-cost-model=dynamic -flimit-function-alignment -fweb -flto -flto-partition=max -ffast-math -funsafe-math-optimizations -fsplit-loops -fbranch-target-load-optimize2 -fbtr-bb-exclusive

There is still room for progress (no PGO for now), and I plan to add command line options to the tool.

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Stockfish compilation optimisation tool

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