private Allocation mutate(Allocation alloc)
{
Allocation mutatedAlloc = alloc.Clone();
if (Rand.NextDouble() < MUTATION_RATE)
{
for (int _ = 0; _ < MUTATE_TASKS_COUNT; _++)
{
string taskId = "";
string originalProcId = "";
do
{
// Get a random task id
int randOriginalProcIndex = Rand.Next(0, mutatedAlloc.ProcessorIds.Count);
originalProcId = mutatedAlloc.ProcessorIds[randOriginalProcIndex];
Processor proc = mutatedAlloc.GetProcessor(originalProcId);
taskId = proc.GetRandomTask();
} while (taskId == "");
// Assign the task id to another processor
string newProcId;
do
{
int randNewProcIndex = Rand.Next(0, mutatedAlloc.ProcessorIds.Count);
newProcId = mutatedAlloc.ProcessorIds[randNewProcIndex];
} while (newProcId == originalProcId);
mutatedAlloc.AssignTaskToProcessor(newProcId, taskId);
mutatedAlloc.RemoveTask(originalProcId, taskId);
}
}
return(mutatedAlloc);
}
private Allocation crossover(Allocation parent1, Allocation parent2)
{
Allocation child = new Allocation(this.coefficients, this.refFreq, this.tasks, this.processors, true);
List <string> processorIds = parent1.ProcessorIds;
int startPos = Rand.Next(0, processorIds.Count);
int endPos = Rand.Next(startPos + 1, processorIds.Count);
while (startPos >= endPos)
{
startPos = Rand.Next(0, processorIds.Count);
endPos = Rand.Next(startPos + 1, processorIds.Count);
}
// Select processors from parent 1
for (int processorIndex = startPos; processorIndex < endPos; processorIndex++)
{
string processorId = processorIds[processorIndex];
child.SetProcessor(processorId, parent1.GetProcessor(processorId));
}
// Remove duplicated tasks
//parent2.RemoveDuplicatedTasks(child.GetAssignedTasks());
// Select processors from parent 2
for (int processorIndex = 0; processorIndex < processorIds.Count; processorIndex++)
{
string processorId = processorIds[processorIndex];
if (!child.ContainsProcessor(processorId))
{
child.SetProcessor(processorId, parent2.GetProcessor(processorId));
}
}
var unassignedTasks = child.GetUnassignedTasks();
foreach (var taskId in unassignedTasks)
{
string randomProcessorId = processorIds[Rand.Next(0, processorIds.Count)];
child.AssignTaskToProcessor(randomProcessorId, taskId);
}
return(child);
}