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Fix precision of cpu to millicore and memory to Mi #8409

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merged 1 commit into from
Apr 19, 2016
Merged

Fix precision of cpu to millicore and memory to Mi #8409

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42 changes: 31 additions & 11 deletions pkg/quota/admission/clusterresourceoverride/admission.go
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,10 @@ const (
)

var (
zeroDec = inf.NewDec(0, 0)
zeroDec = inf.NewDec(0, 0)
miDec = inf.NewDec(1024*1024, 0)
cpuFloor = resource.MustParse("1m")
memFloor = resource.MustParse("1Mi")
)

func init() {
Expand Down Expand Up @@ -153,24 +156,37 @@ func (a *clusterResourceOverridePlugin) Admit(attr admission.Attributes) error {
resources := container.Resources
memLimit, memFound := resources.Limits[kapi.ResourceMemory]
if memFound && a.config.memoryRequestToLimitRatio.Cmp(zeroDec) != 0 {
resources.Requests[kapi.ResourceMemory] = resource.Quantity{
Amount: multiply(memLimit.Amount, a.config.memoryRequestToLimitRatio),
Format: resource.BinarySI,
// memory is measured in whole bytes.
// the plugin rounds down to the nearest MiB rather than bytes to improve ease of use for end-users.
amount := multiply(memLimit.Amount, a.config.memoryRequestToLimitRatio)
roundDownToNearestMi := multiply(divide(amount, miDec, 0, inf.RoundDown), miDec)
value := resource.Quantity{Amount: roundDownToNearestMi, Format: resource.BinarySI}
if memFloor.Cmp(value) > 0 {
value = *(memFloor.Copy())
}
resources.Requests[kapi.ResourceMemory] = value
}
if memFound && a.config.limitCPUToMemoryRatio.Cmp(zeroDec) != 0 {
resources.Limits[kapi.ResourceCPU] = resource.Quantity{
// float math is necessary here as there is no way to create an inf.Dec to represent cpuBaseScaleFactor < 0.001
Amount: multiply(inf.NewDec(int64(float64(memLimit.Value())*cpuBaseScaleFactor), 3), a.config.limitCPUToMemoryRatio),
Format: resource.DecimalSI,
// float math is necessary here as there is no way to create an inf.Dec to represent cpuBaseScaleFactor < 0.001
// cpu is measured in millicores, so we need to scale and round down the value to nearest millicore scale
amount := multiply(inf.NewDec(int64(float64(memLimit.Value())*cpuBaseScaleFactor), 3), a.config.limitCPUToMemoryRatio)
amount.Round(amount, 3, inf.RoundDown)
value := resource.Quantity{Amount: amount, Format: resource.DecimalSI}
if cpuFloor.Cmp(value) > 0 {
value = *(cpuFloor.Copy())
}
resources.Limits[kapi.ResourceCPU] = value
}
cpuLimit, cpuFound := resources.Limits[kapi.ResourceCPU]
if cpuFound && a.config.cpuRequestToLimitRatio.Cmp(zeroDec) != 0 {
resources.Requests[kapi.ResourceCPU] = resource.Quantity{
Amount: multiply(cpuLimit.Amount, a.config.cpuRequestToLimitRatio),
Format: resource.DecimalSI,
// cpu is measured in millicores, so we need to scale and round down the value to nearest millicore scale
amount := multiply(cpuLimit.Amount, a.config.cpuRequestToLimitRatio)
amount.Round(amount, 3, inf.RoundDown)
value := resource.Quantity{Amount: amount, Format: resource.DecimalSI}
if cpuFloor.Cmp(value) > 0 {
value = *(cpuFloor.Copy())
}
resources.Requests[kapi.ResourceCPU] = value
}
}
glog.V(5).Infof("%s: pod limits after overrides are: %#v", api.PluginName, pod.Spec.Containers[0].Resources)
Expand All @@ -180,3 +196,7 @@ func (a *clusterResourceOverridePlugin) Admit(attr admission.Attributes) error {
func multiply(x *inf.Dec, y *inf.Dec) *inf.Dec {
return inf.NewDec(0, 0).Mul(x, y)
}

func divide(x *inf.Dec, y *inf.Dec, s inf.Scale, r inf.Rounder) *inf.Dec {
return inf.NewDec(0, 0).QuoRound(x, y, s, r)
}
40 changes: 35 additions & 5 deletions pkg/quota/admission/clusterresourceoverride/admission_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -130,14 +130,23 @@ func TestLimitRequestAdmission(t *testing.T) {
namespace *kapi.Namespace
}{
{
name: "this thing even runs",
name: "ignore pods that have no memory limit specified",
config: testConfig(100, 50, 50),
object: testPod("0", "0", "0", "0"),
object: testBestEffortPod(),
expectedMemRequest: resource.MustParse("0"),
expectedCpuLimit: resource.MustParse("0"),
expectedCpuRequest: resource.MustParse("0"),
namespace: fakeNamespace(true),
},
{
name: "test floor for memory and cpu",
config: testConfig(100, 50, 50),
object: testPod("1Mi", "0", "0", "0"),
expectedMemRequest: resource.MustParse("1Mi"),
expectedCpuLimit: resource.MustParse("1m"),
expectedCpuRequest: resource.MustParse("1m"),
namespace: fakeNamespace(true),
},
{
name: "nil config",
config: nil,
Expand Down Expand Up @@ -184,12 +193,21 @@ func TestLimitRequestAdmission(t *testing.T) {
namespace: fakeNamespace(true),
},
{
name: "little values don't get lost",
name: "little values mess things up",
config: testConfig(500, 10, 10),
object: testPod("1.024Mi", "0", "0", "0"),
expectedMemRequest: resource.MustParse(".0001Gi"),
expectedMemRequest: resource.MustParse("1Mi"),
expectedCpuLimit: resource.MustParse("5m"),
expectedCpuRequest: resource.MustParse(".5m"),
expectedCpuRequest: resource.MustParse("1m"),
namespace: fakeNamespace(true),
},
{
name: "test fractional memory requests round up",
config: testConfig(500, 10, 60),
object: testPod("512Mi", "0", "0", "0"),
expectedMemRequest: resource.MustParse("307Mi"),
expectedCpuLimit: resource.MustParse("2.5"),
expectedCpuRequest: resource.MustParse("250m"),
namespace: fakeNamespace(true),
},
}
Expand Down Expand Up @@ -231,6 +249,18 @@ func TestLimitRequestAdmission(t *testing.T) {
}
}

func testBestEffortPod() *kapi.Pod {
return &kapi.Pod{
Spec: kapi.PodSpec{
Containers: []kapi.Container{
{
Resources: kapi.ResourceRequirements{},
},
},
},
}
}

func testPod(memLimit string, memRequest string, cpuLimit string, cpuRequest string) *kapi.Pod {
return &kapi.Pod{
Spec: kapi.PodSpec{
Expand Down