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package hst
import (
"bufio"
"errors"
"fmt"
. "github.com/onsi/ginkgo/v2"
"os"
"os/exec"
"strconv"
"strings"
)
var CgroupPath = "/sys/fs/cgroup/"
type CpuContext struct {
cpuAllocator *CpuAllocatorT
cpus []int
}
type CpuAllocatorT struct {
cpus []int
runningInCi bool
buildNumber int
maxContainerCount int
}
func iterateAndAppend(start int, end int, slice []int) []int {
for i := start; i <= end; i++ {
slice = append(slice, i)
}
return slice
}
var cpuAllocator *CpuAllocatorT = nil
func (c *CpuAllocatorT) Allocate(containerCount int, nCpus int) (*CpuContext, error) {
var cpuCtx CpuContext
// indexes, not actual cores
var minCpu, maxCpu int
if c.runningInCi {
minCpu = ((c.buildNumber) * c.maxContainerCount * nCpus)
maxCpu = ((c.buildNumber + 1) * c.maxContainerCount * nCpus) - 1
} else {
minCpu = ((GinkgoParallelProcess() - 1) * c.maxContainerCount * nCpus)
maxCpu = (GinkgoParallelProcess() * c.maxContainerCount * nCpus) - 1
}
if len(c.cpus)-1 < maxCpu {
err := fmt.Errorf("could not allocate %d CPUs; available count: %d; attempted to allocate cores with index %d-%d; max index: %d;\n"+
"available cores: %v", nCpus*containerCount, len(c.cpus), minCpu, maxCpu, len(c.cpus)-1, c.cpus)
return nil, err
}
if containerCount == 1 {
cpuCtx.cpus = c.cpus[minCpu : minCpu+nCpus]
} else if containerCount > 1 && containerCount <= c.maxContainerCount {
cpuCtx.cpus = c.cpus[minCpu+(nCpus*(containerCount-1)) : minCpu+(nCpus*containerCount)]
} else {
return nil, fmt.Errorf("too many containers; CPU allocation for >%d containers is not implemented", c.maxContainerCount)
}
cpuCtx.cpuAllocator = c
return &cpuCtx, nil
}
func (c *CpuAllocatorT) readCpus() error {
var first, second, third, fourth int
var file *os.File
var err error
if c.runningInCi {
// non-debug build runs on node0, debug on node1
if *IsDebugBuild {
file, err = os.Open("/sys/devices/system/node/node1/cpulist")
} else {
file, err = os.Open("/sys/devices/system/node/node0/cpulist")
}
if err != nil {
return err
}
defer file.Close()
sc := bufio.NewScanner(file)
sc.Scan()
line := sc.Text()
_, err = fmt.Sscanf(line, "%d-%d,%d-%d", &first, &second, &third, &fourth)
if err != nil {
return err
}
c.cpus = iterateAndAppend(first, second, c.cpus)
c.cpus = iterateAndAppend(third, fourth, c.cpus)
} else if NumaAwareCpuAlloc {
var fifth, sixth int
var tmpCpus []int
file, err := os.Open("/sys/devices/system/node/online")
if err != nil {
return err
}
defer file.Close()
sc := bufio.NewScanner(file)
sc.Scan()
line := sc.Text()
// get numa node range
_, err = fmt.Sscanf(line, "%d-%d", &first, &second)
if err != nil {
return err
}
for i := first; i <= second; i++ {
file, err := os.Open("/sys/devices/system/node/node" + fmt.Sprint(i) + "/cpulist")
if err != nil {
return err
}
defer file.Close()
// get numa node cores
sc := bufio.NewScanner(file)
sc.Scan()
line := sc.Text()
_, err = fmt.Sscanf(line, "%d-%d,%d-%d", &third, &fourth, &fifth, &sixth)
if err != nil {
return err
}
// get numa node cores from first range
tmpCpus = iterateAndAppend(third, fourth, tmpCpus)
// discard cpu 0
if tmpCpus[0] == 0 && !*UseCpu0{
tmpCpus = tmpCpus[1:]
}
// get numa node cores from second range
tmpCpus = iterateAndAppend(fifth, sixth, tmpCpus)
// make c.cpus divisible by maxContainerCount * nCpus, so we don't have to check which numa will be used
// and we can use offsets
count_to_remove := len(tmpCpus) % (c.maxContainerCount * *NConfiguredCpus)
c.cpus = append(c.cpus, tmpCpus[:len(tmpCpus)-count_to_remove]...)
tmpCpus = tmpCpus[:0]
}
} else {
// Path depends on cgroup version. We need to check which version is in use.
// For that following command can be used: 'stat -fc %T /sys/fs/cgroup/'
// In case the output states 'cgroup2fs' then cgroups v2 is used, 'tmpfs' in case cgroups v1.
cmd := exec.Command("stat", "-fc", "%T", "/sys/fs/cgroup/")
byteOutput, err := cmd.CombinedOutput()
if err != nil {
return err
}
CpuPath := CgroupPath
if strings.Contains(string(byteOutput), "tmpfs") {
CpuPath += "cpuset/cpuset.effective_cpus"
} else if strings.Contains(string(byteOutput), "cgroup2fs") {
CpuPath += "cpuset.cpus.effective"
} else {
return errors.New("cgroup unknown fs: " + string(byteOutput))
}
file, err := os.Open(CpuPath)
if err != nil {
return err
}
defer file.Close()
sc := bufio.NewScanner(file)
sc.Scan()
line := sc.Text()
_, err = fmt.Sscanf(line, "%d-%d", &first, &second)
if err != nil {
return err
}
c.cpus = iterateAndAppend(first, second, c.cpus)
}
// discard cpu 0
if c.cpus[0] == 0 && !*UseCpu0 {
c.cpus = c.cpus[1:]
}
return nil
}
func CpuAllocator() (*CpuAllocatorT, error) {
if cpuAllocator == nil {
var err error
cpuAllocator = new(CpuAllocatorT)
cpuAllocator.maxContainerCount = 4
buildNumberStr := os.Getenv("BUILD_NUMBER")
if buildNumberStr != "" {
cpuAllocator.runningInCi = true
// get last digit of build number
cpuAllocator.buildNumber, err = strconv.Atoi(buildNumberStr[len(buildNumberStr)-1:])
if err != nil {
return nil, err
}
}
err = cpuAllocator.readCpus()
if err != nil {
return nil, err
}
}
return cpuAllocator, nil
}
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