57 lines
1.9 KiB
Go
57 lines
1.9 KiB
Go
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package util
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import (
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"runtime"
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docker "github.com/fsouza/go-dockerclient"
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cstructs "github.com/hashicorp/nomad/client/structs"
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"github.com/hashicorp/nomad/helper/stats"
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)
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var (
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// The statistics the Docker driver exposes
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DockerMeasuredCPUStats = []string{"Throttled Periods", "Throttled Time", "Percent"}
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DockerMeasuredMemStats = []string{"RSS", "Usage", "Max Usage"}
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)
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func DockerStatsToTaskResourceUsage(s *docker.Stats) *cstructs.TaskResourceUsage {
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ms := &cstructs.MemoryStats{
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RSS: s.MemoryStats.PrivateWorkingSet,
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Usage: s.MemoryStats.Commit,
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MaxUsage: s.MemoryStats.CommitPeak,
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Measured: DockerMeasuredMemStats,
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}
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cpuPercent := 0.0
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// https://github.com/moby/moby/blob/cbb885b07af59225eef12a8159e70d1485616d57/integration-cli/docker_api_stats_test.go#L47-L58
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// Max number of 100ns intervals between the previous time read and now
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possIntervals := uint64(s.Read.Sub(s.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(s.NumProcs) // Multiple by the number of processors
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// Intervals used
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intervalsUsed := s.CPUStats.CPUUsage.TotalUsage - s.PreCPUStats.CPUUsage.TotalUsage
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// Percentage avoiding divide-by-zero
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if possIntervals > 0 {
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cpuPercent = float64(intervalsUsed) / float64(possIntervals) * 100.0
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}
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cs := &cstructs.CpuStats{
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ThrottledPeriods: s.CPUStats.ThrottlingData.ThrottledPeriods,
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ThrottledTime: s.CPUStats.ThrottlingData.ThrottledTime,
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Percent: cpuPercent,
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TotalTicks: (cpuPercent / 100) * stats.TotalTicksAvailable() / float64(runtime.NumCPU()),
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Measured: DockerMeasuredCPUStats,
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}
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return &cstructs.TaskResourceUsage{
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ResourceUsage: &cstructs.ResourceUsage{
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MemoryStats: ms,
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CpuStats: cs,
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},
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Timestamp: s.Read.UTC().UnixNano(),
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}
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}
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