85 lines
2.4 KiB
Go
85 lines
2.4 KiB
Go
package fingerprint
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import (
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"fmt"
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log "github.com/hashicorp/go-hclog"
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"github.com/hashicorp/nomad/helper/stats"
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"github.com/hashicorp/nomad/nomad/structs"
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)
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const (
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// defaultCPUTicks is the default amount of CPU resources assumed to be
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// available if the CPU performance data is unable to be detected. This is
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// common on EC2 instances, where the env_aws fingerprinter will follow up,
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// setting an accurate value.
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defaultCPUTicks = 1000 // 1 core * 1 GHz
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)
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// CPUFingerprint is used to fingerprint the CPU
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type CPUFingerprint struct {
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StaticFingerprinter
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logger log.Logger
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}
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// NewCPUFingerprint is used to create a CPU fingerprint
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func NewCPUFingerprint(logger log.Logger) Fingerprint {
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f := &CPUFingerprint{logger: logger.Named("cpu")}
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return f
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}
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func (f *CPUFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error {
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cfg := req.Config
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setResourcesCPU := func(totalCompute int) {
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// COMPAT(0.10): Remove in 0.10
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resp.Resources = &structs.Resources{
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CPU: totalCompute,
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}
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resp.NodeResources = &structs.NodeResources{
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Cpu: structs.NodeCpuResources{
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CpuShares: int64(totalCompute),
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},
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}
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}
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if err := stats.Init(); err != nil {
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f.logger.Warn("failed initializing stats collector", "error", err)
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}
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if modelName := stats.CPUModelName(); modelName != "" {
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resp.AddAttribute("cpu.modelname", modelName)
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}
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if mhz := stats.CPUMHzPerCore(); mhz > 0 {
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resp.AddAttribute("cpu.frequency", fmt.Sprintf("%.0f", mhz))
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f.logger.Debug("detected cpu frequency", "MHz", log.Fmt("%.0f", mhz))
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}
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if numCores := stats.CPUNumCores(); numCores > 0 {
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resp.AddAttribute("cpu.numcores", fmt.Sprintf("%d", numCores))
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f.logger.Debug("detected core count", "cores", numCores)
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}
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tt := int(stats.TotalTicksAvailable())
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if cfg.CpuCompute > 0 {
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f.logger.Debug("using user specified cpu compute", "cpu_compute", cfg.CpuCompute)
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tt = cfg.CpuCompute
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}
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// If we cannot detect the cpu total compute, fallback to a very low default
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// value and log a message about configuring cpu_total_compute. This happens
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// on Graviton instances where CPU information is unavailable. In that case,
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// the env_aws fingerprinter updates the value with correct information.
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if tt == 0 {
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f.logger.Info("fallback to default cpu total compute, set client config option cpu_total_compute to override")
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tt = defaultCPUTicks
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}
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resp.AddAttribute("cpu.totalcompute", fmt.Sprintf("%d", tt))
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setResourcesCPU(tt)
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resp.Detected = true
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return nil
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}
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