#207 Replace scaleCpu option with dedicated column CPU Scaled

The new column is disabled by default.

README.md

@@ -82,7 +82,6 @@ Option | Description
 `-i`  | invert default colors
 `-r`	| reverse container sort order
 `-s`  | select initial container sort field
-`-scale-cpu`	| show cpu as % of system total
 `-v`	| output version information and exit
 
 ### Keybindings

config/columns.go

@@ -26,6 +26,11 @@ var defaultColumns = []Column{
 		Label:   "CPU Usage",
 		Enabled: true,
 	},
+	Column{
+		Name:    "cpus",
+		Label:   "CPU Usage as % of system total",
+		Enabled: false,
+	},
 	Column{
 		Name:    "mem",
 		Label:   "Memory Usage",

config/switch.go

@@ -22,11 +22,6 @@ var defaultSwitches = []*Switch{
 		Val:   true,
 		Label: "Enable status header",
 	},
-	&Switch{
-		Key:   "scaleCpu",
-		Val:   false,
-		Label: "Show CPU as %% of system total",
-	},
 }
 
 type Switch struct {

connector/collector/docker.go

@@ -1,7 +1,6 @@
 package collector
 
 import (
-	"github.com/bcicen/ctop/config"
 	"github.com/bcicen/ctop/models"
 	api "github.com/fsouza/go-dockerclient"
 )
@@ -16,7 +15,6 @@ type Docker struct {
 	done       chan bool
 	lastCpu    float64
 	lastSysCpu float64
-	scaleCpu   bool
 }
 
 func NewDocker(client *api.Client, id string) *Docker {
@@ -24,7 +22,6 @@ func NewDocker(client *api.Client, id string) *Docker {
 		Metrics: models.Metrics{},
 		id:      id,
 		client:  client,
-		scaleCpu: config.GetSwitchVal("scaleCpu"),
 	}
 }
 
@@ -79,18 +76,15 @@ func (c *Docker) Stop() {
 }
 
 func (c *Docker) ReadCPU(stats *api.Stats) {
-	ncpus := float64(len(stats.CPUStats.CPUUsage.PercpuUsage))
+	ncpus := uint8(len(stats.CPUStats.CPUUsage.PercpuUsage))
 	total := float64(stats.CPUStats.CPUUsage.TotalUsage)
 	system := float64(stats.CPUStats.SystemCPUUsage)
 
 	cpudiff := total - c.lastCpu
 	syscpudiff := system - c.lastSysCpu
 
-	if c.scaleCpu {
+	c.NCpus = ncpus
 	c.CPUUtil = percent(cpudiff, syscpudiff)
-	} else {
-		c.CPUUtil = percent(ncpus*cpudiff, syscpudiff)
-	}
 	c.lastCpu = total
 	c.lastSysCpu = system
 	c.Pids = int(stats.PidsStats.Current)

connector/collector/runc.go

@@ -9,7 +9,6 @@ import (
 	"github.com/opencontainers/runc/libcontainer/cgroups"
 	"github.com/opencontainers/runc/types"
 
-	"github.com/bcicen/ctop/config"
 	"github.com/bcicen/ctop/models"
 )
 
@@ -24,7 +23,6 @@ type Runc struct {
 	interval   int // collection interval, in seconds
 	lastCpu    float64
 	lastSysCpu float64
-	scaleCpu   bool
 }
 
 func NewRunc(libc libcontainer.Container) *Runc {
@@ -33,7 +31,6 @@ func NewRunc(libc libcontainer.Container) *Runc {
 		id:       libc.ID(),
 		libc:     libc,
 		interval: 1,
-		scaleCpu: config.GetSwitchVal("scaleCpu"),
 	}
 	return c
 }
@@ -89,18 +86,15 @@ func (c *Runc) run() {
 
 func (c *Runc) ReadCPU(stats *cgroups.Stats) {
 	u := stats.CpuStats.CpuUsage
-	ncpus := float64(len(u.PercpuUsage))
+	ncpus := uint8(len(u.PercpuUsage))
 	total := float64(u.TotalUsage)
 	system := float64(getSysCPUUsage())
 
 	cpudiff := total - c.lastCpu
 	syscpudiff := system - c.lastSysCpu
 
-	if c.scaleCpu {
+	c.NCpus = ncpus
 	c.CPUUtil = percent(cpudiff, syscpudiff)
-	} else {
-		c.CPUUtil = percent(ncpus*cpudiff, syscpudiff)
-	}
 	c.lastCpu = total
 	c.lastSysCpu = system
 	c.Pids = int(stats.PidsStats.Current)

cwidgets/compact/column.go

@@ -13,6 +13,7 @@ var (
 		"name":   NewNameCol,
 		"id":     NewCIDCol,
 		"cpu":    NewCPUCol,
+		"cpus":   NewCpuScaledCol,
 		"mem":    NewMemCol,
 		"net":    NewNetCol,
 		"io":     NewIOCol,

cwidgets/compact/gauge.go

@@ -11,14 +11,22 @@ import (
 
 type CPUCol struct {
 	*GaugeCol
+	scaleCpu bool
 }
 
 func NewCPUCol() CompactCol {
-	return &CPUCol{NewGaugeCol("CPU")}
+	return &CPUCol{NewGaugeCol("CPU"), false}
+}
+
+func NewCpuScaledCol() CompactCol {
+	return &CPUCol{NewGaugeCol("CPUS"), true}
 }
 
 func (w *CPUCol) SetMetrics(m models.Metrics) {
 	val := m.CPUUtil
+	if !w.scaleCpu {
+		val = val * int(m.NCpus)
+	}
 	w.BarColor = colorScale(val)
 	w.Label = fmt.Sprintf("%d%%", val)
 

main.go

@@ -44,7 +44,6 @@ func main() {
 		sortFieldFlag   = flag.String("s", "", "select container sort field")
 		reverseSortFlag = flag.Bool("r", false, "reverse container sort order")
 		invertFlag      = flag.Bool("i", false, "invert default colors")
-		scaleCpu        = flag.Bool("scale-cpu", false, "show cpu as % of system total")
 		connectorFlag   = flag.String("connector", "docker", "container connector to use")
 	)
 	flag.Parse()
@@ -86,10 +85,6 @@ func main() {
 		config.Toggle("sortReversed")
 	}
 
-	if *scaleCpu {
-		config.Toggle("scaleCpu")
-	}
-
 	// init ui
 	if *invertFlag {
 		InvertColorMap()

models/main.go

@@ -31,6 +31,7 @@ func (m Meta) Get(k string) string {
 }
 
 type Metrics struct {
+	NCpus        uint8
 	CPUUtil      int
 	NetTx        int64
 	NetRx        int64