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machine.go
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machine.go
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// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package machine
import (
"fmt"
"io/ioutil"
"regexp"
"strconv"
"strings"
"github.com/golang/glog"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/utils"
"github.com/google/cadvisor/utils/sysfs"
"github.com/google/cadvisor/utils/sysinfo"
)
// The utils/machine package contains functions that extract machine-level specs.
var cpuRegExp = regexp.MustCompile("processor\\t*: +([0-9]+)")
var coreRegExp = regexp.MustCompile("core id\\t*: +([0-9]+)")
var nodeRegExp = regexp.MustCompile("physical id\\t*: +([0-9]+)")
var CpuClockSpeedMHz = regexp.MustCompile("cpu MHz\\t*: +([0-9]+.[0-9]+)")
var memoryCapacityRegexp = regexp.MustCompile("MemTotal: *([0-9]+) kB")
var swapCapacityRegexp = regexp.MustCompile("SwapTotal: *([0-9]+) kB")
// GetClockSpeed returns the CPU clock speed, given a []byte formatted as the /proc/cpuinfo file.
func GetClockSpeed(procInfo []byte) (uint64, error) {
// First look through sys to find a max supported cpu frequency.
const maxFreqFile = "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq"
if utils.FileExists(maxFreqFile) {
val, err := ioutil.ReadFile(maxFreqFile)
if err != nil {
return 0, err
}
var maxFreq uint64
n, err := fmt.Sscanf(string(val), "%d", &maxFreq)
if err != nil || n != 1 {
return 0, fmt.Errorf("could not parse frequency %q", val)
}
return maxFreq, nil
}
// Fall back to /proc/cpuinfo
matches := CpuClockSpeedMHz.FindSubmatch(procInfo)
if len(matches) != 2 {
//Check if we are running on Power systems which have a different format
CpuClockSpeedMHz, _ = regexp.Compile("clock\\t*: +([0-9]+.[0-9]+)MHz")
matches = CpuClockSpeedMHz.FindSubmatch(procInfo)
if len(matches) != 2 {
return 0, fmt.Errorf("could not detect clock speed from output: %q", string(procInfo))
}
}
speed, err := strconv.ParseFloat(string(matches[1]), 64)
if err != nil {
return 0, err
}
// Convert to kHz
return uint64(speed * 1000), nil
}
// GetMachineMemoryCapacity returns the machine's total memory from /proc/meminfo.
// Returns the total memory capacity as an int64 (number of bytes).
func GetMachineMemoryCapacity() (int64, error) {
out, err := ioutil.ReadFile("/proc/meminfo")
if err != nil {
return 0, err
}
memoryCapacity, err := parseCapacity(out, memoryCapacityRegexp)
if err != nil {
return 0, err
}
return memoryCapacity, err
}
// GetMachineSwapCapacity returns the machine's total swap from /proc/meminfo.
// Returns the total swap capacity as an int64 (number of bytes).
func GetMachineSwapCapacity() (int64, error) {
out, err := ioutil.ReadFile("/proc/meminfo")
if err != nil {
return 0, err
}
swapCapacity, err := parseCapacity(out, swapCapacityRegexp)
if err != nil {
return 0, err
}
return swapCapacity, err
}
// parseCapacity matches a Regexp in a []byte, returning the resulting value in bytes.
// Assumes that the value matched by the Regexp is in KB.
func parseCapacity(b []byte, r *regexp.Regexp) (int64, error) {
matches := r.FindSubmatch(b)
if len(matches) != 2 {
return -1, fmt.Errorf("failed to match regexp in output: %q", string(b))
}
m, err := strconv.ParseInt(string(matches[1]), 10, 64)
if err != nil {
return -1, err
}
// Convert to bytes.
return m * 1024, err
}
func GetTopology(sysFs sysfs.SysFs, cpuinfo string) ([]info.Node, int, error) {
nodes := []info.Node{}
numCores := 0
lastThread := -1
lastCore := -1
lastNode := -1
for _, line := range strings.Split(cpuinfo, "\n") {
ok, val, err := extractValue(line, cpuRegExp)
if err != nil {
return nil, -1, fmt.Errorf("could not parse cpu info from %q: %v", line, err)
}
if ok {
thread := val
numCores++
if lastThread != -1 {
// New cpu section. Save last one.
nodeIdx, err := addNode(&nodes, lastNode)
if err != nil {
return nil, -1, fmt.Errorf("failed to add node %d: %v", lastNode, err)
}
nodes[nodeIdx].AddThread(lastThread, lastCore)
lastCore = -1
lastNode = -1
}
lastThread = thread
}
ok, val, err = extractValue(line, coreRegExp)
if err != nil {
return nil, -1, fmt.Errorf("could not parse core info from %q: %v", line, err)
}
if ok {
lastCore = val
}
ok, val, err = extractValue(line, nodeRegExp)
if err != nil {
return nil, -1, fmt.Errorf("could not parse node info from %q: %v", line, err)
}
if ok {
lastNode = val
}
}
nodeIdx, err := addNode(&nodes, lastNode)
if err != nil {
return nil, -1, fmt.Errorf("failed to add node %d: %v", lastNode, err)
}
nodes[nodeIdx].AddThread(lastThread, lastCore)
if numCores < 1 {
return nil, numCores, fmt.Errorf("could not detect any cores")
}
for idx, node := range nodes {
caches, err := sysinfo.GetCacheInfo(sysFs, node.Cores[0].Threads[0])
if err != nil {
glog.Errorf("failed to get cache information for node %d: %v", node.Id, err)
continue
}
numThreadsPerCore := len(node.Cores[0].Threads)
numThreadsPerNode := len(node.Cores) * numThreadsPerCore
for _, cache := range caches {
c := info.Cache{
Size: cache.Size,
Level: cache.Level,
Type: cache.Type,
}
if cache.Cpus == numThreadsPerNode && cache.Level > 2 {
// Add a node-level cache.
nodes[idx].AddNodeCache(c)
} else if cache.Cpus == numThreadsPerCore {
// Add to each core.
nodes[idx].AddPerCoreCache(c)
}
// Ignore unknown caches.
}
}
return nodes, numCores, nil
}
func extractValue(s string, r *regexp.Regexp) (bool, int, error) {
matches := r.FindSubmatch([]byte(s))
if len(matches) == 2 {
val, err := strconv.ParseInt(string(matches[1]), 10, 32)
if err != nil {
return true, -1, err
}
return true, int(val), nil
}
return false, -1, nil
}
func findNode(nodes []info.Node, id int) (bool, int) {
for i, n := range nodes {
if n.Id == id {
return true, i
}
}
return false, -1
}
func addNode(nodes *[]info.Node, id int) (int, error) {
var idx int
if id == -1 {
// Some VMs don't fill topology data. Export single package.
id = 0
}
ok, idx := findNode(*nodes, id)
if !ok {
// New node
node := info.Node{Id: id}
// Add per-node memory information.
meminfo := fmt.Sprintf("/sys/devices/system/node/node%d/meminfo", id)
out, err := ioutil.ReadFile(meminfo)
// Ignore if per-node info is not available.
if err == nil {
m, err := parseCapacity(out, memoryCapacityRegexp)
if err != nil {
return -1, err
}
node.Memory = uint64(m)
}
*nodes = append(*nodes, node)
idx = len(*nodes) - 1
}
return idx, nil
}