forked from coreos/fleet
/
resource.go
64 lines (55 loc) · 1.17 KB
/
resource.go
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package machine
import (
"bufio"
"bytes"
"io/ioutil"
"runtime"
"strconv"
"github.com/coreos/fleet/resource"
)
const (
memInfoPath = "/proc/meminfo"
)
func readLocalResources() (res resource.ResourceTuple, err error) {
res.Cores = 100 * runtime.NumCPU()
// TODO(jonboulle): determine disk space
mem, err := readMeminfo()
if err != nil {
return res, err
}
res.Memory = mem
return res, nil
}
// parseMeminfo extracts the total amount of memory and returns it in MB.
func parseMeminfo(memstr []byte) (int, error) {
ss := bufio.NewScanner(bytes.NewBuffer(memstr))
ss.Split(bufio.ScanWords)
seenMemToken := false
mem := 0
for ss.Scan() {
token := ss.Text()
if seenMemToken {
m, err := strconv.Atoi(token)
if err != nil {
return 0, err
}
mem = m >> 10
break
} else if token == "MemTotal:" {
seenMemToken = true
}
}
if err := ss.Err(); err != nil {
return 0, err
}
return mem, nil
}
// readMeminfo reads /proc/meminfo and returns
// the total amount of memory in MB available on the system.
func readMeminfo() (int, error) {
memstr, err := ioutil.ReadFile(memInfoPath)
if err != nil {
return 0, err
}
return parseMeminfo(memstr)
}