Switch on the resource requested prioritization.

examples/guestbook/frontend-controller.json

@@ -13,6 +13,7 @@
            "containers": [{
              "name": "php-redis",
              "image": "brendanburns/php-redis",
+             "cpu": 100,
              "memory": 10000000,
              "ports": [{"containerPort": 80, "hostPort": 8000}]
            }]

examples/guestbook/redis-master.json

@@ -9,6 +9,7 @@
       "containers": [{
         "name": "master",
         "image": "dockerfile/redis",
+        "cpu": 100,
         "ports": [{
           "containerPort": 6379,
           "hostPort": 6379

examples/guestbook/redis-slave-controller.json

@@ -13,6 +13,7 @@
            "containers": [{
              "name": "slave",
              "image": "brendanburns/redis-slave",
+             "cpu": 200,
              "ports": [{"containerPort": 6379, "hostPort": 6380}]
            }]
          }

pkg/scheduler/priorities.go

@@ -22,6 +22,13 @@ import (
 	"github.com/golang/glog"
 )
 
+func calculatePercentage(requested, capacity int) int {
+	if capacity == 0 {
+		return 0
+	}
+	return (requested * 100) / capacity
+}
+
 // Calculate the occupancy on a node.  'node' has information about the resources on the node.
 // 'pods' is a list of pods currently scheduled on the node.
 func calculateOccupancy(node api.Minion, pods []api.Pod) HostPriority {
@@ -34,8 +41,9 @@ func calculateOccupancy(node api.Minion, pods []api.Pod) HostPriority {
 			totalMemory += container.Memory
 		}
 	}
-	percentageCPU := (totalCPU * 100) / resources.GetIntegerResource(node.NodeResources.Capacity, resources.CPU, 0)
-	percentageMemory := (totalMemory * 100) / resources.GetIntegerResource(node.NodeResources.Capacity, resources.Memory, 0)
+
+	percentageCPU := calculatePercentage(totalCPU, resources.GetIntegerResource(node.NodeResources.Capacity, resources.CPU, 0))
+	percentageMemory := calculatePercentage(totalMemory, resources.GetIntegerResource(node.NodeResources.Capacity, resources.Memory, 0))
 	glog.V(4).Infof("Least Requested Priority, AbsoluteRequested: (%d, %d) Percentage:(%d\\%m, %d\\%)", totalCPU, totalMemory, percentageCPU, percentageMemory)
 
 	return HostPriority{

pkg/scheduler/priorities_test.go

@@ -100,6 +100,15 @@ func TestLeastRequested(t *testing.T) {
 				{DesiredState: cpuAndMemory, CurrentState: machine2State},
 			},
 		},
+		{
+			nodes:        []api.Minion{makeMinion("machine1", 0, 0), makeMinion("machine2", 0, 0)},
+			expectedList: []HostPriority{{"machine1", 0}, {"machine2", 0}},
+			test:         "zero minion resources",
+			pods: []api.Pod{
+				{DesiredState: cpuOnly, CurrentState: machine1State},
+				{DesiredState: cpuAndMemory, CurrentState: machine2State},
+			},
+		},
 	}
 
 	for _, test := range tests {

plugin/pkg/scheduler/factory/factory.go

@@ -76,8 +76,8 @@ func (factory *ConfigFactory) Create() (*scheduler.Config, error) {
 			// Fit is determined by resource availability
 			algorithm.NewResourceFitPredicate(algorithm.StaticNodeInfo{nodes}),
 		},
-		// All nodes where things fit are equally likely (Random)
-		algorithm.EqualPriority,
+		// Prioritize nodes by least requested utilization.
+		algorithm.LeastRequestedPriority,
 		&storeToPodLister{podCache}, r)
 
 	podBackoff := podBackoff{