X-Git-Url: http://git.scottworley.com/planeteer/blobdiff_plain/c45c1bcae7063b858bfa08a2376efe3a87b2c7f2..330093c150f51922dfd2edeca88aff1668e14979:/planeteer.go diff --git a/planeteer.go b/planeteer.go index 25c9e03..7f343b9 100644 --- a/planeteer.go +++ b/planeteer.go @@ -23,19 +23,24 @@ import "json" import "os" import "strings" +var funds = flag.Int("funds", 0, + "Starting funds") + var start = flag.String("start", "", "The planet to start at") +var flight_plan_string = flag.String("flight_plan", "", + "Your hidey-holes for the day, comma-separated.") + var end = flag.String("end", "", - "A comma-separated list of planets to end at") + "A comma-separated list of acceptable ending planets.") var planet_data_file = flag.String("planet_data_file", "planet-data", "The file to read planet data from") -var fuel = flag.Int("fuel", 16, - "Reactor units; How many non-Eden jumps we can make " + - "(but remember that deviating from the flight plan " + - "costs two units of fuel per jump)") +var fuel = flag.Int("fuel", 16, "Reactor units") + +var hold = flag.Int("hold", 300, "Size of your cargo hold") var start_edens = flag.Int("start_edens", 0, "How many Eden Warp Units are you starting with?") @@ -46,19 +51,27 @@ var end_edens = flag.Int("end_edens", 0, var cloak = flag.Bool("cloak", false, "Make sure to end with a Device of Cloaking") -var drones = flag.Int("drones", 0, - "Buy this many Fighter Drones") +var drones = flag.Int("drones", 0, "Buy this many Fighter Drones") -var batteries = flag.Int("batteries", 0, - "Buy this many Shield Batterys") +var batteries = flag.Int("batteries", 0, "Buy this many Shield Batterys") var visit_string = flag.String("visit", "", "A comma-separated list of planets to make sure to visit") func visit() []string { + if *visit_string == "" { + return []string{} + } return strings.Split(*visit_string, ",") } +func flight_plan() []string { + if *flight_plan_string == "" { + return []string{} + } + return strings.Split(*flight_plan_string, ",") +} + type Commodity struct { BasePrice int CanSell bool @@ -68,12 +81,13 @@ type Planet struct { BeaconOn bool /* Use relative prices rather than absolute prices because you can get relative prices without traveling to each planet. */ - RelativePrices map [string] int + RelativePrices map[string]int } type planet_data struct { - Commodities map [string] Commodity - Planets map [string] Planet - pi, ci map [string] int // Generated; not read from file + Commodities map[string]Commodity + Planets map[string]Planet + p2i, c2i map[string]int // Generated; not read from file + i2p, i2c []string // Generated; not read from file } func ReadData() (data planet_data) { @@ -107,76 +121,106 @@ func ReadData() (data planet_data) { * Note that the sizes of each dimension are data driven. Many dimensions * collapse to one possible value (ie, disappear) if the corresponding * feature is not enabled. + * + * The order of the dimensions in the list of constants below determines + * their layout in RAM. The cargo-based 'dimensions' are not completely + * independent -- some combinations are illegal and not used. They are + * handled as three dimensions rather than one for simplicity. Placing + * these dimensions first causes the unused cells in the table to be + * grouped together in large blocks. This keeps them from polluting + * cache lines, and if they are large enough, prevent the memory manager + * from allocating pages for these areas at all. + * + * If the table gets too big to fit in RAM: + * * Combine the Edens, Cloaks, and UnusedCargo dimensions. Of the + * 24 combinations, only 15 are legal: a 38% savings. + * * Reduce the size of the Fuel dimension to 3. We only ever look + * backwards 2 units, so just rotate the logical values through + * the same 3 physical addresses. This is good for an 82% savings. + * * Reduce the size of the Edens dimension from 3 to 2, for the + * same reasons as Fuel above. 33% savings. + * * Buy more ram. (Just sayin'. It's cheaper than you think.) + * */ // The official list of dimensions: const ( - // Name Num Size Description - Edens = iota // 1 3 # of Eden warp units (0 - 2 typically) - Cloaks // 2 2 # of Devices of Cloaking (0 or 1) - UnusedCargo // 3 4 # of unused cargo spaces (0 - 3 typically) - Fuel // 4 17 Reactor power left (0 - 16) - Location // 5 26 Location (which planet) - Hold // 6 15 Cargo bay contents (a *Commodity or nil) - NeedFighters // 7 2 Errand: Buy fighter drones (needed or not) - NeedShields // 8 2 Errand: Buy shield batteries (needed or not) - Visit // 9 2**N Visit: Stop by these N planets in the route + // Name Num Size Description + Edens = iota // 1 3 # of Eden warp units (0 - 2 typically) + Cloaks // 2 2 # of Devices of Cloaking (0 or 1) + UnusedCargo // 3 4 # of unused cargo spaces (0 - 3 typically) + Fuel // 4 17 Reactor power left (0 - 16) + Location // 5 26 Location (which planet) + Hold // 6 15 Cargo bay contents (a *Commodity or nil) + NeedFighters // 7 2 Errand: Buy fighter drones (needed or not) + NeedShields // 8 2 Errand: Buy shield batteries (needed or not) + Visit // 9 2**N Visit: Stop by these N planets in the route NumDimensions ) func bint(b bool) int { - if b { return 1 } + if b { + return 1 + } return 0 } func DimensionSizes(data planet_data) []int { eden_capacity := data.Commodities["Eden Warp Units"].Limit - cloak_capacity := bint(*cloak) - dims := []int{ - eden_capacity + 1, - cloak_capacity + 1, - eden_capacity + cloak_capacity + 1, - *fuel + 1, - len(data.Planets), - len(data.Commodities), - bint(*drones > 0) + 1, - bint(*batteries > 0) + 1, - 1 << uint(len(visit())), + if *start_edens > eden_capacity { + eden_capacity = *start_edens } - if len(dims) != NumDimensions { - panic("Dimensionality mismatch") + cloak_capacity := bint(*cloak) + dims := make([]int, NumDimensions) + dims[Edens] = eden_capacity + 1 + dims[Cloaks] = cloak_capacity + 1 + dims[UnusedCargo] = eden_capacity + cloak_capacity + 1 + dims[Fuel] = *fuel + 1 + dims[Location] = len(data.Planets) + dims[Hold] = len(data.Commodities) + dims[NeedFighters] = bint(*drones > 0) + 1 + dims[NeedShields] = bint(*batteries > 0) + 1 + dims[Visit] = 1 << uint(len(visit())) + + // Remind myself to add a line above when adding new dimensions + for i, dim := range dims { + if dim < 1 { + panic(i) + } } return dims } func StateTableSize(dims []int) int { - sum := 0 + product := 1 for _, size := range dims { - sum += size + product *= size } - return sum + return product } type State struct { - funds, from int -} - -func NewStateTable(dims []int) []State { - return make([]State, StateTableSize(dims)) + value, from int } func EncodeIndex(dims, addr []int) int { index := addr[0] - for i := 1; i < len(dims); i++ { - index = index * dims[i] + addr[i] + if addr[0] > dims[0] { + panic(0) + } + for i := 1; i < NumDimensions; i++ { + if addr[i] > dims[i] { + panic(i) + } + index = index*dims[i] + addr[i] } return index } func DecodeIndex(dims []int, index int) []int { - addr := make([]int, len(dims)) - for i := len(dims) - 1; i > 0; i-- { + addr := make([]int, NumDimensions) + for i := NumDimensions - 1; i > 0; i-- { addr[i] = index % dims[i] index /= dims[i] } @@ -184,102 +228,246 @@ func DecodeIndex(dims []int, index int) []int { return addr } -/* What is the value of hauling 'commodity' from 'from' to 'to'? - * Take into account the available funds and the available cargo space. */ -func TradeValue(data planet_data, - from, to Planet, - commodity string, - initial_funds, max_quantity int) int { - if !data.Commodities[commodity].CanSell { - return 0 +func InitializeStateTable(data planet_data, dims []int) []State { + table := make([]State, StateTableSize(dims)) + + addr := make([]int, NumDimensions) + addr[Fuel] = *fuel + addr[Edens] = *start_edens + addr[Location] = data.p2i[*start] + table[EncodeIndex(dims, addr)].value = *funds + + return table +} + +/* These four fill procedures fill in the cell at address addr by + * looking at all the possible ways to reach this cell and selecting + * the best one. + * + * The other obvious implementation choice is to do this the other way + * around -- for each cell, conditionally overwrite all the other cells + * that are reachable *from* the considered cell. We choose gathering + * reads over scattering writes to avoid having to take a bunch of locks. + */ + +func UpdateCell(table []State, here, there, value_difference int) { + possible_value := table[there].value + value_difference + if table[there].value > 0 && possible_value > table[here].value { + table[here].value = possible_value + table[here].from = there } - from_relative_price, from_available := from.RelativePrices[commodity] - if !from_available { - return 0 +} + +func FillCellByArriving(data planet_data, dims []int, table []State, addr []int) { + my_index := EncodeIndex(dims, addr) + other := make([]int, NumDimensions) + copy(other, addr) + + /* Travel here via a 2-fuel unit jump */ + if addr[Fuel]+2 < dims[Fuel] { + other[Fuel] = addr[Fuel] + 2 + for other[Location] = 0; other[Location] < dims[Location]; other[Location]++ { + UpdateCell(table, my_index, EncodeIndex(dims, other), 0) + } + other[Location] = addr[Location] + other[Fuel] = addr[Fuel] } - to_relative_price, to_available := to.RelativePrices[commodity] - if !to_available { - return 0 + + /* Travel here via a hidey hole */ + if addr[Fuel]+1 < dims[Fuel] { + hole_index := (dims[Fuel] - 1) - (addr[Fuel] + 1) + if hole_index < len(flight_plan()) { + other[Fuel] = addr[Fuel] + 1 + other[Location] = data.p2i[flight_plan()[hole_index]] + UpdateCell(table, my_index, EncodeIndex(dims, other), 0) + other[Location] = addr[Location] + other[Fuel] = addr[Fuel] + } } + /* Travel here via Eden Warp Unit */ + for other[Edens] = addr[Edens] + 1; other[Edens] < dims[Edens]; other[Edens]++ { + for other[Location] = 0; other[Location] < dims[Location]; other[Location]++ { + UpdateCell(table, my_index, EncodeIndex(dims, other), 0) + } + } + other[Location] = addr[Location] + other[Edens] = addr[Edens] +} + +func FillCellBySelling(data planet_data, dims []int, table []State, addr []int) { + if addr[Hold] > 0 { + // Can't sell and still have cargo + return + } + if addr[UnusedCargo] > 0 { + // Can't sell everything and still have 'unused' holds + return + } + my_index := EncodeIndex(dims, addr) + other := make([]int, NumDimensions) + copy(other, addr) + planet := data.i2p[addr[Location]] + for other[Hold] = 0; other[Hold] < dims[Hold]; other[Hold]++ { + commodity := data.i2c[other[Hold]] + if !data.Commodities[commodity].CanSell { + // TODO: Dump cargo + continue + } + relative_price, available := data.Planets[planet].RelativePrices[commodity] + if !available { + continue + } + base_price := data.Commodities[commodity].BasePrice + absolute_price := relative_price * base_price + sell_price := int(float64(absolute_price) * 0.9) + + for other[UnusedCargo] = 0; other[UnusedCargo] < dims[UnusedCargo]; other[UnusedCargo]++ { + + quantity := *hold - other[UnusedCargo] // TODO: Partial sales + sale_value := quantity * sell_price + UpdateCell(table, my_index, EncodeIndex(dims, other), sale_value) + } + } + other[UnusedCargo] = addr[UnusedCargo] +} + +func FillCellByBuying(data planet_data, dims []int, table []State, addr []int) { + if addr[Hold] == 0 { + // Can't buy and then have nothing + return + } + my_index := EncodeIndex(dims, addr) + other := make([]int, NumDimensions) + copy(other, addr) + planet := data.i2p[addr[Location]] + commodity := data.i2c[addr[Hold]] + if !data.Commodities[commodity].CanSell { + return + } + relative_price, available := data.Planets[planet].RelativePrices[commodity] + if !available { + return + } base_price := data.Commodities[commodity].BasePrice - from_absolute_price := from_relative_price * base_price - to_absolute_price := to_relative_price * base_price - buy_price := from_absolute_price - sell_price := int(float64(to_absolute_price) * 0.9) - var can_afford int = initial_funds / buy_price - quantity := can_afford - if quantity > max_quantity { - quantity = max_quantity + absolute_price := relative_price * base_price + quantity := *hold - addr[UnusedCargo] + total_price := quantity * absolute_price + other[Hold] = 0 + UpdateCell(table, my_index, EncodeIndex(dims, other), -total_price) +} + +func FillCellByMisc(data planet_data, dims []int, table []State, addr []int) { + /* Buy Eden warp units */ + /* Buy a Device of Cloaking */ + /* Silly: Dump a Device of Cloaking */ + /* Buy Fighter Drones */ + /* Buy Shield Batteries */ + /* Visit this planet */ +} + +func FillStateTable2Iteration(data planet_data, dims []int, table []State, +addr []int, f func(planet_data, []int, []State, []int)) { + /* TODO: Justify the safety of the combination of this dimension + * iteration and the various phases f. */ + for addr[Hold] = 0; addr[Hold] < dims[Hold]; addr[Hold]++ { + for addr[Cloaks] = 0; addr[Cloaks] < dims[Cloaks]; addr[Cloaks]++ { + for addr[UnusedCargo] = 0; addr[UnusedCargo] < dims[UnusedCargo]; addr[UnusedCargo]++ { + for addr[NeedFighters] = 0; addr[NeedFighters] < dims[NeedFighters]; addr[NeedFighters]++ { + for addr[NeedShields] = 0; addr[NeedShields] < dims[NeedShields]; addr[NeedShields]++ { + for addr[Visit] = 0; addr[Visit] < dims[Visit]; addr[Visit]++ { + f(data, dims, table, addr) + } + } + } + } + } } - return (sell_price - buy_price) * max_quantity } -func FindBestTrades(data planet_data) [][]string { - // TODO: We can't cache this because this can change based on available funds. - best := make([][]string, len(data.Planets)) - for from := range data.Planets { - best[data.pi[from]] = make([]string, len(data.Planets)) - for to := range data.Planets { - best_gain := 0 - price_list := data.Planets[from].RelativePrices - if len(data.Planets[to].RelativePrices) < len(data.Planets[from].RelativePrices) { - price_list = data.Planets[to].RelativePrices +func FillStateTable2(data planet_data, dims []int, table []State, +fuel_remaining, edens_remaining int, planet string, barrier chan<- bool) { + addr := make([]int, len(dims)) + addr[Edens] = edens_remaining + addr[Fuel] = fuel_remaining + addr[Location] = data.p2i[planet] + FillStateTable2Iteration(data, dims, table, addr, FillCellByArriving) + FillStateTable2Iteration(data, dims, table, addr, FillCellBySelling) + FillStateTable2Iteration(data, dims, table, addr, FillCellByBuying) + FillStateTable2Iteration(data, dims, table, addr, FillCellByMisc) + barrier <- true +} + +/* Filling the state table is a set of nested for loops NumDimensions deep. + * We split this into two procedures: 1 and 2. #1 is the outer, slowest- + * changing indexes. #1 fires off many calls to #2 that run in parallel. + * The order of the nesting of the dimensions, the order of iteration within + * each dimension, and where the 1 / 2 split is placed are carefully chosen + * to make this arrangement safe. + * + * Outermost two layers: Go from high-energy states (lots of fuel, edens) to + * low-energy state. These must be processed sequentially and in this order + * because you travel through high-energy states to get to the low-energy + * states. + * + * Third layer: Planet. This is a good layer to parallelize on. There's + * high enough cardinality that we don't have to mess with parallelizing + * multiple layers for good utilization (on 2011 machines). Each thread + * works on one planet's states and need not synchronize with peer threads. + */ +func FillStateTable1(data planet_data, dims []int, table []State) { + barrier := make(chan bool, len(data.Planets)) + eden_capacity := data.Commodities["Eden Warp Units"].Limit + work_units := (float64(*fuel) + 1) * (float64(eden_capacity) + 1) + work_done := 0.0 + for fuel_remaining := *fuel; fuel_remaining >= 0; fuel_remaining-- { + for edens_remaining := eden_capacity; edens_remaining >= 0; edens_remaining-- { + for planet := range data.Planets { + go FillStateTable2(data, dims, table, fuel_remaining, + edens_remaining, planet, barrier) } - for commodity := range price_list { - gain := TradeValue(data, - data.Planets[from], - data.Planets[to], - commodity, - 10000000, - 1) - if gain > best_gain { - best[data.pi[from]][data.pi[to]] = commodity - gain = best_gain - } + for _ = range data.Planets { + <-barrier } + work_done++ + fmt.Printf("\r%3.0f%%", 100*work_done/work_units) } } - return best + print("\n") } // (Example of a use case for generics in Go) -func IndexPlanets(m *map [string] Planet) map [string] int { - index := make(map [string] int, len(*m)) - i := 0 +func IndexPlanets(m *map[string]Planet, start_at int) (map[string]int, []string) { + e2i := make(map[string]int, len(*m)+start_at) + i2e := make([]string, len(*m)+start_at) + i := start_at for e := range *m { - index[e] = i + e2i[e] = i + i2e[i] = e i++ } - return index + return e2i, i2e } -func IndexCommodities(m *map [string] Commodity) map [string] int { - index := make(map [string] int, len(*m)) - i := 0 +func IndexCommodities(m *map[string]Commodity, start_at int) (map[string]int, []string) { + e2i := make(map[string]int, len(*m)+start_at) + i2e := make([]string, len(*m)+start_at) + i := start_at for e := range *m { - index[e] = i + e2i[e] = i + i2e[i] = e i++ } - return index + return e2i, i2e } func main() { flag.Parse() data := ReadData() - data.pi = IndexPlanets(&data.Planets) - data.ci = IndexCommodities(&data.Commodities) + data.p2i, data.i2p = IndexPlanets(&data.Planets, 0) + data.c2i, data.i2c = IndexCommodities(&data.Commodities, 1) dims := DimensionSizes(data) - table := NewStateTable(dims) - table[0] = State{ 1, 1 } - best_trades := FindBestTrades(data) - - for from := range data.Planets { - for to := range data.Planets { - best_trade := "(nothing)" - if best_trades[data.pi[from]][data.pi[to]] != "" { - best_trade = best_trades[data.pi[from]][data.pi[to]] - } - fmt.Printf("%s to %s: %s\n", from, to, best_trade) - } - } + table := InitializeStateTable(data, dims) + FillStateTable1(data, dims, table) + print("Going to print state table...") + fmt.Printf("%v", table) }