package sealer import ( "context" "math/rand" "sort" "sync" "github.com/filecoin-project/lotus/metrics" ) type WindowSelector func(sh *Scheduler, queueLen int, acceptableWindows [][]int, windows []SchedWindow) int // AssignerCommon is a task assigner with customizable parts type AssignerCommon struct { WindowSel WindowSelector } var _ Assigner = &AssignerCommon{} func (a *AssignerCommon) TrySched(sh *Scheduler) { /* This assigns tasks to workers based on: - Task priority (achieved by handling sh.SchedQueue in order, since it's already sorted by priority) - Worker resource availability - Task-specified worker preference (acceptableWindows array below sorted by this preference) - Window request age 1. For each task in the SchedQueue find windows which can handle them 1.1. Create list of windows capable of handling a task 1.2. Sort windows according to task selector preferences 2. Going through SchedQueue again, assign task to first acceptable window with resources available 3. Submit windows with scheduled tasks to workers */ windowsLen := len(sh.OpenWindows) queueLen := sh.SchedQueue.Len() log.Debugf("SCHED %d queued; %d open windows", queueLen, windowsLen) if windowsLen == 0 || queueLen == 0 { // nothing to schedule on return } windows := make([]SchedWindow, windowsLen) for i := range windows { windows[i].Allocated = *NewActiveResources() } acceptableWindows := make([][]int, queueLen) // QueueIndex -> []OpenWindowIndex // Step 1 throttle := make(chan struct{}, windowsLen) partDone := metrics.Timer(sh.mctx, metrics.SchedAssignerCandidatesDuration) defer func() { partDone() }() var wg sync.WaitGroup wg.Add(queueLen) for i := 0; i < queueLen; i++ { throttle <- struct{}{} go func(sqi int) { defer wg.Done() defer func() { <-throttle }() task := (*sh.SchedQueue)[sqi] task.IndexHeap = sqi var havePreferred bool for wnd, windowRequest := range sh.OpenWindows { worker, ok := sh.Workers[windowRequest.Worker] if !ok { log.Errorf("worker referenced by windowRequest not found (worker: %s)", windowRequest.Worker) // TODO: How to move forward here? continue } if !worker.Enabled { log.Debugw("skipping disabled worker", "worker", windowRequest.Worker) continue } needRes := worker.Info.Resources.ResourceSpec(task.Sector.ProofType, task.TaskType) // TODO: allow bigger windows if !windows[wnd].Allocated.CanHandleRequest(task.SealTask(), needRes, windowRequest.Worker, "schedAcceptable", worker.Info) { continue } rpcCtx, cancel := context.WithTimeout(task.Ctx, SelectorTimeout) ok, preferred, err := task.Sel.Ok(rpcCtx, task.TaskType, task.Sector.ProofType, worker) cancel() if err != nil { log.Errorf("trySched(1) req.Sel.Ok error: %+v", err) continue } if !ok { continue } if havePreferred && !preferred { // we have a way better worker for this task continue } if preferred && !havePreferred { // all workers we considered previously are much worse choice acceptableWindows[sqi] = acceptableWindows[sqi][:0] havePreferred = true } acceptableWindows[sqi] = append(acceptableWindows[sqi], wnd) } if len(acceptableWindows[sqi]) == 0 { return } // Pick best worker (shuffle in case some workers are equally as good) rand.Shuffle(len(acceptableWindows[sqi]), func(i, j int) { acceptableWindows[sqi][i], acceptableWindows[sqi][j] = acceptableWindows[sqi][j], acceptableWindows[sqi][i] // nolint:scopelint }) sort.SliceStable(acceptableWindows[sqi], func(i, j int) bool { wii := sh.OpenWindows[acceptableWindows[sqi][i]].Worker // nolint:scopelint wji := sh.OpenWindows[acceptableWindows[sqi][j]].Worker // nolint:scopelint if wii == wji { // for the same worker prefer older windows return acceptableWindows[sqi][i] < acceptableWindows[sqi][j] // nolint:scopelint } wi := sh.Workers[wii] wj := sh.Workers[wji] rpcCtx, cancel := context.WithTimeout(task.Ctx, SelectorTimeout) defer cancel() r, err := task.Sel.Cmp(rpcCtx, task.TaskType, wi, wj) if err != nil { log.Errorf("selecting best worker: %s", err) } return r }) }(i) } wg.Wait() log.Debugf("SCHED windows: %+v", windows) log.Debugf("SCHED Acceptable win: %+v", acceptableWindows) // Step 2 partDone() partDone = metrics.Timer(sh.mctx, metrics.SchedAssignerWindowSelectionDuration) scheduled := a.WindowSel(sh, queueLen, acceptableWindows, windows) // Step 3 partDone() partDone = metrics.Timer(sh.mctx, metrics.SchedAssignerSubmitDuration) if scheduled == 0 { return } scheduledWindows := map[int]struct{}{} for wnd, window := range windows { if len(window.Todo) == 0 { // Nothing scheduled here, keep the window open continue } scheduledWindows[wnd] = struct{}{} window := window // copy select { case sh.OpenWindows[wnd].Done <- &window: default: log.Error("expected sh.OpenWindows[wnd].Done to be buffered") } } // Rewrite sh.OpenWindows array, removing scheduled windows newOpenWindows := make([]*SchedWindowRequest, 0, windowsLen-len(scheduledWindows)) for wnd, window := range sh.OpenWindows { if _, scheduled := scheduledWindows[wnd]; scheduled { // keep unscheduled windows open continue } newOpenWindows = append(newOpenWindows, window) } sh.OpenWindows = newOpenWindows }