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authorJordan Christiansen <xordspar0@gmail.com>2020-10-31 09:32:52 -0500
committerJordan Christiansen <xordspar0@gmail.com>2020-10-31 10:07:11 -0500
commit03579649063d669f9f57d534f74136befef98c62 (patch)
tree3b2d9d5e5e52c46c53d6e5b9c439f26067f9a0b2 /pkg
parent2aaa036f560e2c42ebb033869eeef539dbc47fef (diff)
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Centralize cores and period/quota conversion code
Signed-off-by: Jordan Christiansen <xordspar0@gmail.com>
Diffstat (limited to 'pkg')
-rw-r--r--pkg/domain/infra/abi/play.go9
-rw-r--r--pkg/util/utils.go23
-rw-r--r--pkg/util/utils_test.go20
3 files changed, 46 insertions, 6 deletions
diff --git a/pkg/domain/infra/abi/play.go b/pkg/domain/infra/abi/play.go
index 57de0f3b1..fbba00984 100644
--- a/pkg/domain/infra/abi/play.go
+++ b/pkg/domain/infra/abi/play.go
@@ -36,8 +36,6 @@ const (
kubeDirectoryPermission = 0755
// https://kubernetes.io/docs/concepts/storage/volumes/#hostpath
kubeFilePermission = 0644
- // Kubernetes sets CPUPeriod to 100000us (100ms): https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet/
- defaultCPUPeriod = 100000
)
func (ic *ContainerEngine) PlayKube(ctx context.Context, path string, options entities.PlayKubeOptions) (*entities.PlayKubeReport, error) {
@@ -515,10 +513,9 @@ func kubeContainerToCreateConfig(ctx context.Context, containerYAML v1.Container
return nil, errors.Wrap(err, "Failed to set CPU quota")
}
if milliCPU > 0 {
- containerConfig.Resources.CPUPeriod = defaultCPUPeriod
- // CPU quota is a fraction of the period: milliCPU / 1000.0 * period
- // Or, without floating point math:
- containerConfig.Resources.CPUQuota = milliCPU * defaultCPUPeriod / 1000
+ period, quota := util.CoresToPeriodAndQuota(float64(milliCPU) / 1000)
+ containerConfig.Resources.CPUPeriod = period
+ containerConfig.Resources.CPUQuota = quota
}
containerConfig.Resources.Memory, err = quantityToInt64(containerYAML.Resources.Limits.Memory())
diff --git a/pkg/util/utils.go b/pkg/util/utils.go
index a9aad657d..415fd169b 100644
--- a/pkg/util/utils.go
+++ b/pkg/util/utils.go
@@ -653,3 +653,26 @@ func CreateCidFile(cidfile string, id string) error {
cidFile.Close()
return nil
}
+
+// DefaultCPUPeriod is the default CPU period is 100us, which is the same default
+// as Kubernetes.
+const DefaultCPUPeriod uint64 = 100000
+
+// CoresToPeriodAndQuota converts a fraction of cores to the equivalent
+// Completely Fair Scheduler (CFS) parameters period and quota.
+//
+// Cores is a fraction of the CFS period that a container may use. Period and
+// Quota are in microseconds.
+func CoresToPeriodAndQuota(cores float64) (uint64, int64) {
+ return DefaultCPUPeriod, int64(cores * float64(DefaultCPUPeriod))
+}
+
+// PeriodAndQuotaToCores takes the CFS parameters period and quota and returns
+// a fraction that represents the limit to the number of cores that can be
+// utilized over the scheduling period.
+//
+// Cores is a fraction of the CFS period that a container may use. Period and
+// Quota are in microseconds.
+func PeriodAndQuotaToCores(period uint64, quota int64) float64 {
+ return float64(quota) / float64(period)
+}
diff --git a/pkg/util/utils_test.go b/pkg/util/utils_test.go
index a9b37844e..cb737bd76 100644
--- a/pkg/util/utils_test.go
+++ b/pkg/util/utils_test.go
@@ -257,3 +257,23 @@ func TestValidateSysctlBadSysctl(t *testing.T) {
_, err := ValidateSysctls(strSlice)
assert.Error(t, err)
}
+
+func TestCoresToPeriodAndQuota(t *testing.T) {
+ cores := 1.0
+ expectedPeriod := DefaultCPUPeriod
+ expectedQuota := int64(DefaultCPUPeriod)
+
+ actualPeriod, actualQuota := CoresToPeriodAndQuota(cores)
+ assert.Equal(t, actualPeriod, expectedPeriod, "Period does not match")
+ assert.Equal(t, actualQuota, expectedQuota, "Quota does not match")
+}
+
+func TestPeriodAndQuotaToCores(t *testing.T) {
+ var (
+ period uint64 = 100000
+ quota int64 = 50000
+ expectedCores = 0.5
+ )
+
+ assert.Equal(t, PeriodAndQuotaToCores(period, quota), expectedCores)
+}