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authorOpenShift Merge Robot <openshift-merge-robot@users.noreply.github.com>2022-03-23 20:37:25 +0100
committerGitHub <noreply@github.com>2022-03-23 20:37:25 +0100
commit73713062806aa4c2db25dc62e2fff47406085dc8 (patch)
tree218b63ae146c34a784e238c43c18a33eca971d85 /libpod
parent109224717354b1d32d1be854a019fe9d4a55cfa6 (diff)
parent130bcc3a93d82674eaaf2a62f854983db263a940 (diff)
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Merge pull request #13597 from Luap99/stats
podman stats: calc CPU percentage correctly
Diffstat (limited to 'libpod')
-rw-r--r--libpod/define/containerstate.go1
-rw-r--r--libpod/pod.go9
-rw-r--r--libpod/stats.go22
3 files changed, 14 insertions, 18 deletions
diff --git a/libpod/define/containerstate.go b/libpod/define/containerstate.go
index 23ba1f451..9ad3aec08 100644
--- a/libpod/define/containerstate.go
+++ b/libpod/define/containerstate.go
@@ -138,7 +138,6 @@ type ContainerStats struct {
CPU float64
CPUNano uint64
CPUSystemNano uint64
- DataPoints int64
SystemNano uint64
MemUsage uint64
MemLimit uint64
diff --git a/libpod/pod.go b/libpod/pod.go
index 6273ff247..ed2d97b37 100644
--- a/libpod/pod.go
+++ b/libpod/pod.go
@@ -422,10 +422,6 @@ type PodContainerStats struct {
// GetPodStats returns the stats for each of its containers
func (p *Pod) GetPodStats(previousContainerStats map[string]*define.ContainerStats) (map[string]*define.ContainerStats, error) {
- var (
- ok bool
- prevStat *define.ContainerStats
- )
p.lock.Lock()
defer p.lock.Unlock()
@@ -438,10 +434,7 @@ func (p *Pod) GetPodStats(previousContainerStats map[string]*define.ContainerSta
}
newContainerStats := make(map[string]*define.ContainerStats)
for _, c := range containers {
- if prevStat, ok = previousContainerStats[c.ID()]; !ok {
- prevStat = &define.ContainerStats{}
- }
- newStats, err := c.GetContainerStats(prevStat)
+ newStats, err := c.GetContainerStats(previousContainerStats[c.ID()])
// If the container wasn't running, don't include it
// but also suppress the error
if err != nil && errors.Cause(err) != define.ErrCtrStateInvalid {
diff --git a/libpod/stats.go b/libpod/stats.go
index b5d39240d..25baa378d 100644
--- a/libpod/stats.go
+++ b/libpod/stats.go
@@ -14,7 +14,9 @@ import (
"github.com/pkg/errors"
)
-// GetContainerStats gets the running stats for a given container
+// GetContainerStats gets the running stats for a given container.
+// The previousStats is used to correctly calculate cpu percentages. You
+// should pass nil if there is no previous stat for this container.
func (c *Container) GetContainerStats(previousStats *define.ContainerStats) (*define.ContainerStats, error) {
stats := new(define.ContainerStats)
stats.ContainerID = c.ID()
@@ -36,6 +38,14 @@ func (c *Container) GetContainerStats(previousStats *define.ContainerStats) (*de
return stats, define.ErrCtrStateInvalid
}
+ if previousStats == nil {
+ previousStats = &define.ContainerStats{
+ // if we have no prev stats use the container start time as prev time
+ // otherwise we cannot correctly calculate the CPU percentage
+ SystemNano: uint64(c.state.StartedTime.UnixNano()),
+ }
+ }
+
cgroupPath, err := c.cGroupPath()
if err != nil {
return nil, err
@@ -67,8 +77,8 @@ func (c *Container) GetContainerStats(previousStats *define.ContainerStats) (*de
stats.Duration = cgroupStats.CPU.Usage.Total
stats.UpTime = time.Duration(stats.Duration)
stats.CPU = calculateCPUPercent(cgroupStats, previousCPU, now, previousStats.SystemNano)
- stats.AvgCPU = calculateAvgCPU(stats.CPU, previousStats.AvgCPU, previousStats.DataPoints)
- stats.DataPoints = previousStats.DataPoints + 1
+ // calc the average cpu usage for the time the container is running
+ stats.AvgCPU = calculateCPUPercent(cgroupStats, 0, now, uint64(c.state.StartedTime.UnixNano()))
stats.MemUsage = cgroupStats.Memory.Usage.Usage
stats.MemLimit = c.getMemLimit()
stats.MemPerc = (float64(stats.MemUsage) / float64(stats.MemLimit)) * 100
@@ -146,9 +156,3 @@ func calculateBlockIO(stats *cgroups.Metrics) (read uint64, write uint64) {
}
return
}
-
-// calculateAvgCPU calculates the avg CPU percentage given the previous average and the number of data points.
-func calculateAvgCPU(statsCPU float64, prevAvg float64, prevData int64) float64 {
- avgPer := ((prevAvg * float64(prevData)) + statsCPU) / (float64(prevData) + 1)
- return avgPer
-}