Move overcommit outside of binpacking and use 105 instead of 0.05

Signed-off-by: Victor Vieux <vieux@docker.com>

flags.go

@@ -50,10 +50,15 @@ var (
 		Name:  "tlsverify",
 		Usage: "use TLS and verify the remote",
 	}
+	flOverCommit = cli.IntFlag{
+		Name:  "overcommit, oc",
+		Usage: "overcommit to apply on resources",
+		Value: 105,
+	}
 	flStrategy = cli.StringFlag{
 		Name:  "strategy",
 		Usage: "placement strategy to use [binpacking, random]",
-		Value: "binpacking:0.05",
+		Value: "binpacking",
 	}
 	flFilter = cli.StringSliceFlag{
 		Name:  "filter, f",

main.go

@@ -87,7 +87,7 @@ func main() {
 			Flags: []cli.Flag{
 				flDiscovery,
 				flStrategy, flFilter,
-				flHosts, flHeartBeat,
+				flHosts, flHeartBeat, flOverCommit,
 				flTls, flTlsCaCert, flTlsCert, flTlsKey, flTlsVerify,
 				flEnableCors},
 			Action: manage,

manage.go

@@ -78,7 +78,7 @@ func manage(c *cli.Context) {
 		log.Fatal("--discovery required to manage a cluster")
 	}
 
-	s, err := strategy.New(c.String("strategy"))
+	s, err := strategy.New(c.String("strategy"), int64(c.Int("overcommit")))
 	if err != nil {
 		log.Fatal(err)
 	}

scheduler/strategy/binpacking.go

@@ -3,7 +3,6 @@ package strategy
 import (
 	"errors"
 	"sort"
-	"strconv"
 
 	"github.com/docker/swarm/cluster"
 	"github.com/samalba/dockerclient"
@@ -14,21 +13,20 @@ var (
 )
 
 type BinPackingPlacementStrategy struct {
-	ratio int64
+	overcommitRatio int64
 }
 
-func (p *BinPackingPlacementStrategy) Initialize(opts string) error {
-	overcommitRatio, err := strconv.ParseFloat(opts, 64)
-	p.ratio = int64(overcommitRatio * 100)
-	return err
+func (p *BinPackingPlacementStrategy) Initialize(overcommitRatio int64) error {
+	p.overcommitRatio = overcommitRatio - 100
+	return nil
 }
 
 func (p *BinPackingPlacementStrategy) PlaceContainer(config *dockerclient.ContainerConfig, nodes []*cluster.Node) (*cluster.Node, error) {
 	scores := scores{}
 
 	for _, node := range nodes {
-		nodeMemory := node.Memory + (node.Memory * p.ratio / 100)
-		nodeCpus := node.Cpus + (node.Cpus * p.ratio / 100)
+		nodeMemory := node.Memory + (node.Memory * p.overcommitRatio / 100)
+		nodeCpus := node.Cpus + (node.Cpus * p.overcommitRatio / 100)
 
 		// Skip nodes that are smaller than the requested resources.
 		if nodeMemory < int64(config.Memory) || nodeCpus < config.CpuShares {

scheduler/strategy/binpacking_test.go

@@ -114,7 +114,7 @@ func TestPlaceContainerHuge(t *testing.T) {
 }
 
 func TestPlaceContainerOvercommit(t *testing.T) {
-	s, err := New("binpacking:0.05")
+	s, err := New("binpacking", 105)
 	assert.NoError(t, err)
 
 	nodes := []*cluster.Node{createNode("node-1", 0, 1)}

scheduler/strategy/random.go

@@ -13,7 +13,7 @@ import (
 type RandomPlacementStrategy struct {
 }
 
-func (p *RandomPlacementStrategy) Initialize(_ string) error {
+func (p *RandomPlacementStrategy) Initialize(_ int64) error {
 	rand.Seed(time.Now().UTC().UnixNano())
 	return nil
 }

scheduler/strategy/strategy.go

@@ -2,7 +2,6 @@ package strategy
 
 import (
 	"errors"
-	"strings"
 
 	log "github.com/Sirupsen/logrus"
 	"github.com/docker/swarm/cluster"
@@ -10,7 +9,7 @@ import (
 )
 
 type PlacementStrategy interface {
-	Initialize(string) error
+	Initialize(overcommitRatio int64) error
 	// Given a container configuration and a set of nodes, select the target
 	// node where the container should be scheduled.
 	PlaceContainer(config *dockerclient.ContainerConfig, nodes []*cluster.Node) (*cluster.Node, error)
@@ -28,19 +27,10 @@ func init() {
 	}
 }
 
-func New(nameAndOpts string) (PlacementStrategy, error) {
-	var (
-		parts = strings.SplitN(nameAndOpts, ":", 2)
-		name  = parts[0]
-		opts  string
-	)
-	if len(parts) == 2 {
-		opts = parts[1]
-	}
-
+func New(name string, overcommitRatio int64) (PlacementStrategy, error) {
 	if strategy, exists := strategies[name]; exists {
-		log.Debugf("Initializing %q strategy with %q", name, opts)
-		err := strategy.Initialize(opts)
+		log.Debugf("Initializing %q strategy", name)
+		err := strategy.Initialize(overcommitRatio)
 		return strategy, err
 	}