b9464cde7d
Type: test Change-Id: I412be2dec7ff352740e50e838e0ac466bf0a6674 Signed-off-by: Adrian Villin <avillin@cisco.com>
101 lines
2.5 KiB
Go
101 lines
2.5 KiB
Go
package main
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import (
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"bufio"
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"errors"
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"fmt"
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. "github.com/onsi/ginkgo/v2"
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"os"
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"os/exec"
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"strings"
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)
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var CgroupPath = "/sys/fs/cgroup/"
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type CpuContext struct {
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cpuAllocator *CpuAllocatorT
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cpus []int
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}
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type CpuAllocatorT struct {
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cpus []int
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}
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var cpuAllocator *CpuAllocatorT = nil
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func (c *CpuAllocatorT) Allocate(containerCount int, nCpus int) (*CpuContext, error) {
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var cpuCtx CpuContext
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// splitting cpus into equal parts; this will over-allocate cores but it's good enough for now
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maxContainerCount := 4
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// skip CPU 0
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minCpu := ((GinkgoParallelProcess() - 1) * maxContainerCount * nCpus) + 1
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maxCpu := (GinkgoParallelProcess() * maxContainerCount * nCpus)
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if len(c.cpus)-1 < maxCpu {
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err := fmt.Errorf("could not allocate %d CPUs; available: %d; attempted to allocate cores %d-%d",
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nCpus*containerCount, len(c.cpus)-1, minCpu, maxCpu)
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return nil, err
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}
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if containerCount == 1 {
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cpuCtx.cpus = c.cpus[minCpu : minCpu+nCpus]
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} else if containerCount > 1 && containerCount <= maxContainerCount {
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cpuCtx.cpus = c.cpus[minCpu+(nCpus*(containerCount-1)) : minCpu+(nCpus*containerCount)]
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} else {
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return nil, fmt.Errorf("too many containers; CPU allocation for >%d containers is not implemented", maxContainerCount)
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}
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cpuCtx.cpuAllocator = c
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return &cpuCtx, nil
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}
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func (c *CpuAllocatorT) readCpus() error {
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var first, last int
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// Path depends on cgroup version. We need to check which version is in use.
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// For that following command can be used: 'stat -fc %T /sys/fs/cgroup/'
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// In case the output states 'cgroup2fs' then cgroups v2 is used, 'tmpfs' in case cgroups v1.
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cmd := exec.Command("stat", "-fc", "%T", "/sys/fs/cgroup/")
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byteOutput, err := cmd.CombinedOutput()
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if err != nil {
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return err
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}
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CpuPath := CgroupPath
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if strings.Contains(string(byteOutput), "tmpfs") {
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CpuPath += "cpuset/cpuset.effective_cpus"
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} else if strings.Contains(string(byteOutput), "cgroup2fs") {
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CpuPath += "cpuset.cpus.effective"
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} else {
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return errors.New("cgroup unknown fs: " + string(byteOutput))
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}
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file, err := os.Open(CpuPath)
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if err != nil {
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return err
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}
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defer file.Close()
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sc := bufio.NewScanner(file)
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sc.Scan()
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line := sc.Text()
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_, err = fmt.Sscanf(line, "%d-%d", &first, &last)
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if err != nil {
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return err
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}
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for i := first; i <= last; i++ {
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c.cpus = append(c.cpus, i)
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}
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return nil
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}
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func CpuAllocator() (*CpuAllocatorT, error) {
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if cpuAllocator == nil {
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cpuAllocator = new(CpuAllocatorT)
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err := cpuAllocator.readCpus()
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if err != nil {
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return nil, err
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}
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}
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return cpuAllocator, nil
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}
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