Documentation ¶
Index ¶
- Constants
- func AlternateTaskFinder(distroID string) ([]task.Task, error)
- func DeficitBasedHostAllocator(ctx context.Context, hostAllocatorData HostAllocatorData) (int, error)
- func DurationBasedHostAllocator(ctx context.Context, hostAllocatorData HostAllocatorData) (int, error)
- func LegacyFindRunnableTasks(distroID string) ([]task.Task, error)
- func ParallelTaskFinder(distroID string) ([]task.Task, error)
- func PlanDistro(ctx context.Context, conf Configuration, s *evergreen.Settings) error
- func RunnableTasksPipeline(distroID string) ([]task.Task, error)
- func UtilizationBasedHostAllocator(ctx context.Context, hostAllocatorData HostAllocatorData) (int, error)
- type CmpBasedTaskComparator
- type CmpBasedTaskPrioritizer
- type CmpBasedTaskQueues
- type Configuration
- type DBTaskQueuePersister
- type DistroScheduleData
- type HostAllocator
- type HostAllocatorData
- type ScheduledDistroTasksData
- type Scheduler
- type TaskFinder
- type TaskPrioritizer
- type TaskQueuePersister
Constants ¶
const ( // maximum turnaround we want to maintain for all hosts for a given distro MaxDurationPerDistroHost = 30 * time.Minute MaxDurationPerDistroHostWithContainers = 5 * time.Minute // indicates the fraction of the total duration of shared tasks that we want // to account for when alternate distros are unable to satisfy the // turnaround requirement as determined by MaxDurationPerDistroHost SharedTasksAllocationProportion = 0.8 )
const (
RunnerName = "scheduler"
)
Variables ¶
This section is empty.
Functions ¶
func DeficitBasedHostAllocator ¶
func DeficitBasedHostAllocator(ctx context.Context, hostAllocatorData HostAllocatorData) (int, error)
DeficitBasedHostAllocator decides how many new hosts are needed for a distro by seeing if the number of tasks that need to be run for the distro is greater than the number of hosts currently free to run a task. Returns a map of distro-># of hosts to spawn.
func DurationBasedHostAllocator ¶
func DurationBasedHostAllocator(ctx context.Context, hostAllocatorData HostAllocatorData) (int, error)
NewHostsNeeded decides if new hosts are needed for a distro while taking the duration of running/scheduled tasks into consideration. Returns a map of distro to number of hosts to spawn.
func LegacyFindRunnableTasks ¶
The old Task finderDBTaskFinder, with the dependency check implemented in Go, instead of using $graphLookup
func PlanDistro ¶
func UtilizationBasedHostAllocator ¶
func UtilizationBasedHostAllocator(ctx context.Context, hostAllocatorData HostAllocatorData) (int, error)
Types ¶
type CmpBasedTaskComparator ¶
type CmpBasedTaskComparator struct {
// contains filtered or unexported fields
}
CmpBasedTaskComparator runs the tasks through a slice of comparator functions determining which is more important.
func NewCmpBasedTaskComparator ¶
func NewCmpBasedTaskComparator() *CmpBasedTaskComparator
NewCmpBasedTaskComparator returns a new task prioritizer, using the default set of comparators as well as the setup functions necessary for those comparators.
func (*CmpBasedTaskComparator) Len ¶
func (self *CmpBasedTaskComparator) Len() int
func (*CmpBasedTaskComparator) Less ¶
func (self *CmpBasedTaskComparator) Less(i, j int) bool
func (*CmpBasedTaskComparator) Swap ¶
func (self *CmpBasedTaskComparator) Swap(i, j int)
type CmpBasedTaskPrioritizer ¶
type CmpBasedTaskPrioritizer struct{}
func (*CmpBasedTaskPrioritizer) PrioritizeTasks ¶
func (prioritizer *CmpBasedTaskPrioritizer) PrioritizeTasks(distroId string, tasks []task.Task, versions map[string]version.Version) ([]task.Task, error)
PrioritizeTask prioritizes the tasks to run. First splits the tasks into slices based on whether they are part of patch versions or automatically created versions. Then prioritizes each slice, and merges them. Returns a full slice of the prioritized tasks, and an error if one occurs.
type CmpBasedTaskQueues ¶
type CmpBasedTaskQueues struct { HighPriorityTasks []task.Task PatchTasks []task.Task RepotrackerTasks []task.Task }
CmpBasedTaskQueues represents the three types of queues that are created for merging together into one queue. The HighPriorityTasks list represent the tasks that are always placed at the front of the queue PatchTasks and RepotrackerTasks are interleaved after the high priority tasks.
type Configuration ¶
type DBTaskQueuePersister ¶
type DBTaskQueuePersister struct{}
DBTaskQueuePersister saves a queue to the database.
func (*DBTaskQueuePersister) PersistTaskQueue ¶
func (self *DBTaskQueuePersister) PersistTaskQueue(distro string, tasks []task.Task) ([]model.TaskQueueItem, error)
PersistTaskQueue saves the task queue to the database. Returns an error if the db call returns an error.
type DistroScheduleData ¶
type DistroScheduleData struct {
// contains filtered or unexported fields
}
DistroScheduleData contains bookkeeping data that is used by distros to determine whether or not to allocate more hosts
type HostAllocator ¶
type HostAllocator func(context.Context, HostAllocatorData) (int, error)
HostAllocator is responsible for determining how many new hosts should be spun up. Parameters:
taskQueueItems: a map of distro name -> task queue items for that distro (a TaskQueue object) distros: a map of distro name -> information on that distro (a model.Distro object) existingDistroHosts: a map of distro name -> currently running hosts on that distro projectTaskDurations: the expected duration of tasks by project and variant taskRunDistros: a map of task id -> distros the task is allowed to run on
Returns a map of distro name -> how many hosts need to be spun up for that distro.
func GetHostAllocator ¶
func GetHostAllocator(name string) HostAllocator
type HostAllocatorData ¶
type HostAllocatorData struct {
// contains filtered or unexported fields
}
HostAllocatorData is the set of parameters passed to a HostAllocator.
type ScheduledDistroTasksData ¶
type ScheduledDistroTasksData struct {
// contains filtered or unexported fields
}
ScheduledDistroTasksData contains data that is used to compute the expected duration of tasks within a distro's queue
type Scheduler ¶
type Scheduler struct { *evergreen.Settings TaskPrioritizer TaskQueuePersister HostAllocator FindRunnableTasks TaskFinder }
Responsible for prioritizing and scheduling tasks to be run, on a per-distro basis.
type TaskFinder ¶
func GetTaskFinder ¶
func GetTaskFinder(name string) TaskFinder
type TaskPrioritizer ¶
type TaskPrioritizer interface { // Takes in a slice of tasks and the current MCI settings. // Returns the slice of tasks, sorted in the order in which they should // be run, as well as an error if appropriate. PrioritizeTasks(distroId string, tasks []task.Task, versions map[string]version.Version) ([]task.Task, error) }
TaskPrioritizer is responsible for taking in a slice of tasks, and ordering them according to which should be run first.
type TaskQueuePersister ¶
type TaskQueuePersister interface { // distro, tasks, duration cache PersistTaskQueue(string, []task.Task) ([]model.TaskQueueItem, error) }
TaskQueuePersister is responsible for taking a task queue for a particular distro and saving it.