sched: Configurable assigners

node/config/def.go

@@ -159,6 +159,8 @@ func DefaultStorageMiner() *StorageMiner {
 			// it's the ratio between 10gbit / 1gbit
 			ParallelFetchLimit: 10,
 
+			Assigner: "utilization",
+
 			// By default use the hardware resource filtering strategy.
 			ResourceFiltering: sectorstorage.ResourceFilteringHardware,
 		},

node/config/types.go

@@ -330,6 +330,11 @@ type SealerConfig struct {
 	AllowProveReplicaUpdate2 bool
 	AllowRegenSectorKey      bool
 
+	// Assigner specifies the worker assigner to use when scheduling tasks.
+	// "utilization" (default) - assign tasks to workers with lowest utilization.
+	// "spread" - assign tasks to as many distinct workers as possible.
+	Assigner string
+
 	// ResourceFiltering instructs the system which resource filtering strategy
 	// to use when evaluating tasks against this worker. An empty value defaults
 	// to "hardware".