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591394fb62
* drivers: plumb hardware topology via grpc into drivers This PR swaps out the temporary use of detecting system hardware manually in each driver for using the Client's detected topology by plumbing the data over gRPC. This ensures that Client configuration is taken to account consistently in all references to system topology. * cr: use enum instead of bool for core grade * cr: fix test slit tables to be possible
84 lines
1.5 KiB
Go
84 lines
1.5 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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//go:build linux
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package numalib
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import (
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"context"
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"os/exec"
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"regexp"
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"strconv"
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"time"
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"github.com/hashicorp/nomad/client/lib/numalib/hw"
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)
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const (
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dmidecodeCmd = "dmidecode"
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)
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var (
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dmiCurSpeedRe = regexp.MustCompile(`Current Speed:\s+(\d+)\s+MHz`)
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)
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type Smbios struct {
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data string
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}
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func (s *Smbios) ScanSystem(top *Topology) {
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if !s.available() {
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return
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}
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// sysfs should work on ec2 for detecting numa nodes
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// and so we skip those steps here at least for now, because reading
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// smbios is very platform specific
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// detect guess-level core performance data
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s.discoverCores(top)
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}
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func (s *Smbios) available() bool {
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path, err := exec.LookPath(dmidecodeCmd)
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if err != nil {
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return false
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}
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ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
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defer cancel()
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cmd := exec.CommandContext(ctx, path, "-t", "4")
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b, err := cmd.CombinedOutput()
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if err != nil {
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return false
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}
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s.data = string(b)
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return true
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}
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func (s *Smbios) discoverCores(top *Topology) {
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curSpeeds := dmiCurSpeedRe.FindStringSubmatch(s.data)
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if len(curSpeeds) < 2 {
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return
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}
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maxCurSpeed := 0
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for i := 1; i < len(curSpeeds); i++ {
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curSpeed, err := strconv.Atoi(curSpeeds[i])
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if err == nil {
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if curSpeed > maxCurSpeed {
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maxCurSpeed = curSpeed
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}
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}
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}
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// set the guess speed to the highest detected current speed
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for i := 0; i < len(top.Cores); i++ {
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top.Cores[i].GuessSpeed = hw.MHz(maxCurSpeed)
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}
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}
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