This project is an implementation of the pop_jump_push algorithm. It uses graph data from the MMORPG Black Desert Online's town building networks, which provide varying graph sizes and multistate nodes, to generate and score exact solutions to the problem of minimizing cost while maximizing utilization given minimum usage levels.
In Black Desert Online the map is split into regions, each region consists of towns and the towns have buildings in chains where a building can be required to be rented prior to another building in the chain (an arborescence). The buildings can be used for many purposes and this project only concerns itself with worker lodging and warehouse storage.
Note: Calpheon City, Valencia City and Heidel are not included in the exact results.
When one chain can provide the same or more lodging/storage for less or the same cost it is said to 'dominate' another chain. Multiple chains can be dominant for a cost such that one may have more or less lodging/storage than the other but both have the same or more than the requested counts.
> housecraft -R "Velia" -S 12 -L 3
Building 🪙 📦 👷
────────────────────────────────────────────
Velia 1, Rm. 1 1 1
Velia 1, Rm. 2 1 2
Velia 1, Rm. 3 1 5
Balenos 1-1, Bartali Farm 2 5
Balenos 1-2, Bartali Farm 1 5
Totals 6 15 3
════════════════════════════════════════════
Building 🪙 📦 👷
────────────────────────────────────────────
Velia 1, Rm. 1 1 3
Velia 1, Rm. 2 1 2
Velia 1, Rm. 3 1 2
Balenos 1-1, Bartali Farm 2 5
Balenos 1-2, Bartali Farm 1 5
Totals 6 13 4
════════════════════════════════════════════> housecraft --list-crafts -R Shakatu
Shakatu
Crafting Usage Count
───────────────────────────────
Crop Factory 1 1
Fish Factory 1 1
Lodging 1 3
Lodging 2 2
Lodging 3 1
Mineral Workshop 1 1
Mushroom Factory 1 2
Refinery 1 1
Refinery 2 2
Residence 1 7
Storage 1 2
Storage 2 2
Storage 3 2
Storage 4 1
Tool Workshop 1 1
Tool Workshop 2 1
Wood Workshop 1 1
═══════════════════════════════> housecraft --find-craft "Wood Workshop 2"
Duvencrune
Crafting Usage Key Building Cost
───────────────────────────────────────────────────────────
Wood Workshop 2 3615 Dormann Lumber Camp 2 7
Wood Workshop 2 3616 Khimut Lumber Camp 1-1 5
═══════════════════════════════════════════════════════════
Eilton
Crafting Usage Key Building Cost
──────────────────────────────────────────────────
Wood Workshop 2 3821 Camp Balacs 1 3
══════════════════════════════════════════════════
Grána
Crafting Usage Key Building Cost
─────────────────────────────────────────────
Wood Workshop 2 3510 Grána 9 6
═════════════════════════════════════════════
O'draxxia
Crafting Usage Key Building Cost
────────────────────────────────────────────────
Wood Workshop 2 3803 O'draxxia 3 3
════════════════════════════════════════════════> housecraft --list-regions
Region CP Storage Lodging
──────────────────────────────────────────────────
Altinova 143 386 18
Ancado Inner Harbor 13 36 3
Arehaza 8 26 3
Calpheon City 585 1703 94
Duvencrune 96 272 7
Eilton 22 112 11
Glish 16 57 4
Grána 132 288 8
Heidel 156 416 27
Iliya Island 19 59 2
Keplan 60 163 10
Muiquun 8 32 0
O'draxxia 16 80 13
Old Wisdom Tree 5 32 0
Olvia 50 151 15
Port Epheria 60 188 28
Sand Grain Bazaar 24 67 7
Shakatu 18 44 11
Tarif 31 86 7
Trent 38 109 9
Valencia City 340 1116 46
Velia 45 117 7
Totals 1885 5540 330
══════════════════════════════════════════════════- Exhaustively calculates exact node chain costs for warehouse and workers.
- Data is written to a file
/data/housecraft/{region_name}.jsoncontaining storage, lodging, building and usage states sorted by warehouse and worker count in ascending order.
> housecraft.exe --generate -R Velia
Generating values for Velia consisting of 23 buildings in 186624 chains with 1166400 storage/lodging combinations
With a maximum cost of 45 with 7 lodging and 98 storage (out of 117 possible).
[2023-04-02T08:56:59.946816800Z] generating...
[2023-04-02T08:56:59.954274Z] Visited 1166400 combinations.
[2023-04-02T08:56:59.954342300Z] retaining...
Captured chain count: 795
[2023-04-02T08:56:59.954715Z] writing...
Result: 252 'best of best' scored storage/lodging chains written to ./data/housecraft/Velia.json- Calculates node chain costs for warehouse and workers using HiGHS.
- Data is written to a file
/data/housecraft/{region_name}.jsoncontaining storage, lodging, building and usage states sorted by warehouse and worker count in ascending order.
> housecraft.exe --optimize -R Velia
[2023-04-25T22:56:47.468527300Z INFO housecraft] Start up
[2023-04-25T22:56:47.468602200Z INFO housecraft::optimize] preparing...
Optimizing values for Velia consisting of 23 buildings in 186624 chains with 1166400 storage/lodging combinations
With a maximum cost of 45 with 7 lodging and 98 storage (out of 117 possible).
[2023-04-25T22:56:47.473279400Z INFO housecraft::optimize] optimizing...
[2023-04-25T22:56:47.474107800Z INFO housecraft::optimize] START: Job 0 with 944 combinations on 24 nodes using 72 cols and 37 rows.
[2023-04-25T22:56:48.237550900Z INFO housecraft::optimize] COMPLETE: Job 0 with 944 combinations with 878 feasible yielding 878 chains.
[2023-04-25T22:56:48.237850100Z INFO housecraft::optimize] merging...
[2023-04-25T22:56:48.238293500Z INFO housecraft::optimize] Captured chain count: 878
[2023-04-25T22:56:48.238523600Z INFO housecraft::optimize] retaining...
[2023-04-25T22:56:48.239145700Z INFO housecraft::optimize] Retained chain count: 252
[2023-04-25T22:56:48.239284200Z INFO housecraft::optimize] writing...
Result: 252 'best of best' scored storage/lodging chains written to ./data/housecraft/Velia.json.
[2023-04-25T22:56:48.240876000Z INFO housecraft] CompleteEven though the generator visits all combinations of all buildings in all states and the optimizer visits all combinations of storage and lodging they both yield only the dominating chains.
A dominant chain strictly dominates a different chain when it provides the same or more workers and or warehouse counts for less or the same cost.
The resulting chains are the best-of-the-best chains for any combination of cost, worker and warehouse counts.
All regions except Heidel, Valencia City and Calpheon City have had exact results generated.
The exact results validated the results of the both the Python implmentated optimizer using CBC and the Rust implemented optimizer using HiGHS with 100% matches. Then both CBC and HiGHS optimized the regions of Heidel, Valencia City and Calpheon City with only a single resulting difference. That difference was on an instance that would never happen in reality; it utilized 6 lodging, and either 399 or 400 storage slots both with a cost of 152 when the maximum usable lodging in-game is 192 per region.
External requirements for building on Windows:
- cmake
- clang
- libz
- ninja