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helpers: refactor and expose function for sum of container req/limits
Currently we only care about the sum of sandbox resources, which includes a pod overhead if defined. We have a need for also calculating *just* the sum of container requests/limits for CPU / Memory, so let's do a refactor and expose this new helper function. Signed-off-by: Eric Ernst <eric_ernst@apple.com>
This commit is contained in:
Eric Ernst
parent
91be6f7926
commit
ac88cd7691
@ -36,15 +36,17 @@ func PodRequestsAndLimits(pod *v1.Pod) (reqs, limits v1.ResourceList) {
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return PodRequestsAndLimitsReuse(pod, nil, nil)
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}
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// PodRequestsAndLimitsReuse returns a dictionary of all defined resources summed up for all
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// containers of the pod. If PodOverhead feature is enabled, pod overhead is added to the
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// total container resource requests and to the total container limits which have a
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// non-zero quantity. The caller may avoid allocations of resource lists by passing
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// a requests and limits list to the function, which will be cleared before use.
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func PodRequestsAndLimitsReuse(pod *v1.Pod, reuseReqs, reuseLimits v1.ResourceList) (reqs, limits v1.ResourceList) {
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// attempt to reuse the maps if passed, or allocate otherwise
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reqs, limits = reuseOrClearResourceList(reuseReqs), reuseOrClearResourceList(reuseLimits)
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// PodRequestsAndLimitsWithoutOverhead will create a dictionary of all defined resources summed up for all
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// containers of the pod.
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func PodRequestsAndLimitsWithoutOverhead(pod *v1.Pod) (reqs, limits v1.ResourceList) {
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reqs = make(v1.ResourceList, 4)
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limits = make(v1.ResourceList, 4)
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podRequestsAndLimitsWithoutOverhead(pod, reqs, limits)
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return reqs, limits
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}
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func podRequestsAndLimitsWithoutOverhead(pod *v1.Pod, reqs, limits v1.ResourceList) {
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for _, container := range pod.Spec.Containers {
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addResourceList(reqs, container.Resources.Requests)
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addResourceList(limits, container.Resources.Limits)
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@ -54,6 +56,18 @@ func PodRequestsAndLimitsReuse(pod *v1.Pod, reuseReqs, reuseLimits v1.ResourceLi
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maxResourceList(reqs, container.Resources.Requests)
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maxResourceList(limits, container.Resources.Limits)
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}
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}
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// PodRequestsAndLimitsReuse returns a dictionary of all defined resources summed up for all
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// containers of the pod. If PodOverhead feature is enabled, pod overhead is added to the
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// total container resource requests and to the total container limits which have a
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// non-zero quantity. The caller may avoid allocations of resource lists by passing
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// a requests and limits list to the function, which will be cleared before use.
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func PodRequestsAndLimitsReuse(pod *v1.Pod, reuseReqs, reuseLimits v1.ResourceList) (reqs, limits v1.ResourceList) {
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// attempt to reuse the maps if passed, or allocate otherwise
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reqs, limits = reuseOrClearResourceList(reuseReqs), reuseOrClearResourceList(reuseLimits)
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podRequestsAndLimitsWithoutOverhead(pod, reqs, limits)
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// if PodOverhead feature is supported, add overhead for running a pod
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// to the sum of requests and to non-zero limits:
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@ -21,7 +21,7 @@ import (
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"github.com/stretchr/testify/assert"
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"k8s.io/api/core/v1"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/equality"
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"k8s.io/apimachinery/pkg/api/resource"
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)
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@ -337,6 +337,192 @@ func TestPodRequestsAndLimits(t *testing.T) {
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}
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}
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func TestPodRequestsAndLimitsWithoutOverhead(t *testing.T) {
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cases := []struct {
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pod *v1.Pod
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name string
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expectedRequests v1.ResourceList
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expectedLimits v1.ResourceList
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}{
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{
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name: "two container no overhead - should just be sum of containers",
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pod: &v1.Pod{
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Spec: v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: "foobar",
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("1"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("5"),
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},
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Limits: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("2"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("10"),
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},
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},
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},
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{
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Name: "foobar2",
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("4"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("12"),
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},
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Limits: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("8"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("24"),
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},
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},
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},
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},
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},
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},
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expectedRequests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("5"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("17"),
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},
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expectedLimits: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("10"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("34"),
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},
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},
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{
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name: "two container with overhead - shouldn't consider overhead",
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pod: &v1.Pod{
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Spec: v1.PodSpec{
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Overhead: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("3"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("8"),
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},
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Containers: []v1.Container{
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{
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Name: "foobar",
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("1"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("5"),
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},
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Limits: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("2"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("10"),
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},
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},
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},
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{
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Name: "foobar2",
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("4"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("12"),
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},
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Limits: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("8"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("24"),
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},
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},
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},
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},
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},
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},
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expectedRequests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("5"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("17"),
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},
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expectedLimits: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("10"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("34"),
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},
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},
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{
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name: "two container with overhead, massive init - should just be the largest init",
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pod: &v1.Pod{
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Spec: v1.PodSpec{
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Overhead: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("3"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("8"),
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},
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Containers: []v1.Container{
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{
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Name: "foobar",
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("1"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("5"),
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},
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Limits: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("2"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("10"),
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},
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},
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},
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{
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Name: "foobar2",
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("4"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("12"),
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},
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Limits: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("8"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("24"),
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},
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},
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},
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},
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InitContainers: []v1.Container{
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{
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Name: "small-init",
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("1"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("5"),
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},
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Limits: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("1"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("5"),
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},
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},
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},
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{
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Name: "big-init",
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("40"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("120"),
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},
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Limits: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("80"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("240"),
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},
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},
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},
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},
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},
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},
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expectedRequests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("40"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("120"),
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},
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expectedLimits: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("80"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("240"),
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},
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},
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}
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for idx, tc := range cases {
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resRequests, resLimits := PodRequestsAndLimitsWithoutOverhead(tc.pod)
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if !equality.Semantic.DeepEqual(tc.expectedRequests, resRequests) {
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t.Errorf("test case failure[%d]: %v, requests:\n expected:\t%v\ngot\t\t%v", idx, tc.name, tc.expectedRequests, resRequests)
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}
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if !equality.Semantic.DeepEqual(tc.expectedLimits, resLimits) {
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t.Errorf("test case failure[%d]: %v, limits:\n expected:\t%v\ngot\t\t%v", idx, tc.name, tc.expectedLimits, resLimits)
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}
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}
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}
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type podResources struct {
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cpuRequest, cpuLimit, memoryRequest, memoryLimit, cpuOverhead, memoryOverhead string
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}
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