75 lines
2.9 KiB
Go
75 lines
2.9 KiB
Go
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// Package docker contains few helper functions copied from
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// https://github.com/docker/cli/blob/master/cli/command/container/stats_helpers.go
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package docker
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import "github.com/docker/docker/api/types"
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func CalculateCPUPercentUnix(previousCPU, previousSystem uint64, v *types.StatsJSON) float64 {
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var (
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cpuPercent = 0.0
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// calculate the change for the cpu usage of the container in between readings
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cpuDelta = float64(v.CPUStats.CPUUsage.TotalUsage) - float64(previousCPU)
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// calculate the change for the entire system between readings
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systemDelta = float64(v.CPUStats.SystemUsage) - float64(previousSystem)
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onlineCPUs = float64(v.CPUStats.OnlineCPUs)
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)
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if onlineCPUs == 0.0 {
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onlineCPUs = float64(len(v.CPUStats.CPUUsage.PercpuUsage))
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}
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if systemDelta > 0.0 && cpuDelta > 0.0 {
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cpuPercent = (cpuDelta / systemDelta) * onlineCPUs * 100.0
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}
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return cpuPercent
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}
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func calculateCPUPercentWindows(v *types.StatsJSON) float64 {
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// Max number of 100ns intervals between the previous time read and now
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possIntervals := uint64(v.Read.Sub(v.PreRead).Nanoseconds()) // Start with number of ns intervals
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possIntervals /= 100 // Convert to number of 100ns intervals
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possIntervals *= uint64(v.NumProcs) // Multiple by the number of processors
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// Intervals used
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intervalsUsed := v.CPUStats.CPUUsage.TotalUsage - v.PreCPUStats.CPUUsage.TotalUsage
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// Percentage avoiding divide-by-zero
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if possIntervals > 0 {
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return float64(intervalsUsed) / float64(possIntervals) * 100.0
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}
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return 0.00
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}
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// CalculateMemUsageUnixNoCache calculate memory usage of the container.
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// Cache is intentionally excluded to avoid misinterpretation of the output.
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//
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// On Docker 19.03 and older, the result is `mem.Usage - mem.Stats["cache"]`.
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// On new docker with cgroup v1 host, the result is `mem.Usage - mem.Stats["total_inactive_file"]`.
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// On new docker with cgroup v2 host, the result is `mem.Usage - mem.Stats["inactive_file"]`.
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//
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// This definition is designed to be consistent with past values and the latest docker CLI
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// * https://github.com/docker/cli/blob/6e2838e18645e06f3e4b6c5143898ccc44063e3b/cli/command/container/stats_helpers.go#L239
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func CalculateMemUsageUnixNoCache(mem types.MemoryStats) float64 {
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// Docker 19.03 and older
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if v, isOldDocker := mem.Stats["cache"]; isOldDocker && v < mem.Usage {
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return float64(mem.Usage - v)
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}
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// cgroup v1
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if v, isCgroup1 := mem.Stats["total_inactive_file"]; isCgroup1 && v < mem.Usage {
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return float64(mem.Usage - v)
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}
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// cgroup v2
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if v := mem.Stats["inactive_file"]; v < mem.Usage {
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return float64(mem.Usage - v)
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}
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return float64(mem.Usage)
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}
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func CalculateMemPercentUnixNoCache(limit float64, usedNoCache float64) float64 {
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// MemoryStats.Limit will never be 0 unless the container is not running and we haven't
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// got any data from cgroup
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if limit != 0 {
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return usedNoCache / limit * 100.0
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}
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return 0
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}
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