sudoku-funpark/solver/split.go

package solver

import (
	"log"
	"os"
	"strconv"
	"time"
)

// Perform some checks
// and
// Modify solver.row1s so it limits the workload to what is only desired.
func (solver *Solver) SelectWorkload() {
	if solver.Controller.Split > len(solver.row1s) {
		log.Println("ERROR: Unable to divide the workload in " + strconv.Itoa(solver.Controller.Split) + " parts, when only " + strconv.Itoa(len(solver.row1s)) + " are available.\n\n")
		os.Exit(1)
	}
	defer solver.timeTrack(time.Now(), "Workload set")
	log.Println("Setting workload")
	log.Println("We are agent " + strconv.Itoa(solver.Controller.Part) + " of " + strconv.Itoa(solver.Controller.Split))
	workloads := solver.splitWorkload()
	solver.setWorkload(workloads)
}

// Determine how workload should be split among the agents
func (solver *Solver) splitWorkload() []int {
	agents := make([]int, solver.Controller.Split)
	var tracker int
	var tasks int = len(solver.row1s)

	for tasks != 0 {
		agents[tracker] += 1
		tasks -= 1
		tracker += 1
		if tracker == solver.Controller.Split {
			tracker = 0
		}
	}

	return agents
}

// Set the workload by setting solver.row1s
func (solver *Solver) setWorkload(agents []int) {
	var start int = 0
	var finish int = 0
	for key, value := range agents {
		if key == solver.Controller.Part-1 {
			finish = start + value
			break
		} else {
			start += value
		}
	}

	// Set the shortened set of instructions
	solver.row1s = solver.row1s[start:finish]

	// Recalculate how much we need to grind through
	solver.Iter = int64(len(solver.row1s)) * int64(len(solver.row2s)) * int64(len(solver.row3s)) * int64(len(solver.row4s)) * int64(len(solver.row5s)) * int64(len(solver.row6s)) * int64(len(solver.row7s)) * int64(len(solver.row8s)) * int64(len(solver.row9s))
}