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README.md

m-queens

Multi-queens, a very fast solver for the general eight queens problem with OpenMP support.

Based on code from https://rosettacode.org/wiki/N-queens_problem#C but much more optimized.

If you find a way to make the code even faster, please let me know. Also feel free to open a Pull Request to add your own benchmarks.

Benchmarks

Single-Thread

Compiled with gcc-7 -o m-queens.bin main.c -O2 -march=native -mtune=native -std=c99 and run with ./m-queens 18.

CPU N Time to solve
Intel(R) Core(TM) i7-4600M CPU@ 3.5 GHz (single core) 18 129.56s

Multi-Thread

Compiled with gcc-7 -o m-queens.bin main.c -O2 -march=native -mtune=native -std=c99 -fopenmp and run with ./m-queens 18.

CPU Cores (real/virtual) N Time to solve Speedup from Single-Thread
Intel(R) Core(TM) i7-4600M CPU@ 3.4 GHz (all cores) 2/4 18 52.56s 2.46

Future Improvements

Use the optimized placement mentioned in https://github.com/preusser/q27 to reduce symmetries.

probably very hard to do with the current implementation

Use OpenCL to make use of GPUs

Work in progress in the sieves, split2_debug and ringbuffer branches.