unistack-org/metrics
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add process_io_* metrics read from /proc/self/io`

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Metrics are:

process_io_read_bytes_total - the number of bytes read via io syscalls such as read and pread
process_io_written_bytes_total - the number of bytes written via io syscalls such as write and pwrite
process_io_read_syscalls_total - the number of read syscalls such as read and pread
process_io_write_syscalls_total - the number of write syscalls such as write and pwrite
process_io_storage_read_bytes_total - the number of bytes read from storage layer
process_io_storage_written_bytes_total - the number of bytes written to storage layer
This commit is contained in:
Aliaksandr Valialkin 2021-02-21 22:45:08 +02:00
parent b862701a8d
commit 5523b934ae
1 changed files with 51 additions and 3 deletions
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54
process_metrics_linux.go
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@ -12,8 +12,6 @@ import (
"time"
)
const statFilepath = "/proc/self/stat"
// See https://github.com/prometheus/procfs/blob/a4ac0826abceb44c40fc71daed2b301db498b93e/proc_stat.go#L40 .
const userHZ = 100
@ -44,6 +42,7 @@ type procStat struct {
}
func writeProcessMetrics(w io.Writer) {
statFilepath := "/proc/self/stat"
data, err := ioutil.ReadFile(statFilepath)
if err != nil {
log.Printf("ERROR: cannot open %s: %s", statFilepath, err)
@ -68,7 +67,8 @@ func writeProcessMetrics(w io.Writer) {
}
// It is expensive obtaining `process_open_fds` when big number of file descriptors is opened,
// don't do it here.
// so don't do it here.
// See writeFDMetrics instead.
utime := float64(p.Utime) / userHZ
stime := float64(p.Stime) / userHZ
@ -81,6 +81,54 @@ func writeProcessMetrics(w io.Writer) {
fmt.Fprintf(w, "process_resident_memory_bytes %d\n", p.Rss*4096)
fmt.Fprintf(w, "process_start_time_seconds %d\n", startTimeSeconds)
fmt.Fprintf(w, "process_virtual_memory_bytes %d\n", p.Vsize)
writeIOMetrics(w)
}
func writeIOMetrics(w io.Writer) {
ioFilepath := "/proc/self/io"
data, err := ioutil.ReadFile(ioFilepath)
if err != nil {
log.Printf("ERROR: cannot open %q: %s", ioFilepath, err)
}
getInt := func(s string) int64 {
n := strings.IndexByte(s, ' ')
if n < 0 {
log.Printf("ERROR: cannot find whitespace in %q at %q", s, ioFilepath)
return 0
}
v, err := strconv.ParseInt(s[n+1:], 10, 64)
if err != nil {
log.Printf("ERROR: cannot parse %q at %q: %s", s, ioFilepath, err)
return 0
}
return v
}
var rchar, wchar, syscr, syscw, readBytes, writeBytes int64
lines := strings.Split(string(data), "\n")
for _, s := range lines {
s = strings.TrimSpace(s)
switch {
case strings.HasPrefix(s, "rchar: "):
rchar = getInt(s)
case strings.HasPrefix(s, "wchar: "):
wchar = getInt(s)
case strings.HasPrefix(s, "syscr: "):
syscr = getInt(s)
case strings.HasPrefix(s, "syscw: "):
syscw = getInt(s)
case strings.HasPrefix(s, "read_bytes: "):
readBytes = getInt(s)
case strings.HasPrefix(s, "write_bytes: "):
writeBytes = getInt(s)
}
}
fmt.Fprintf(w, "process_io_read_bytes_total %d\n", rchar)
fmt.Fprintf(w, "process_io_written_bytes_total %d\n", wchar)
fmt.Fprintf(w, "process_io_read_syscalls_total %d\n", syscr)
fmt.Fprintf(w, "process_io_write_syscalls_total %d\n", syscw)
fmt.Fprintf(w, "process_io_storage_read_bytes_total %d\n", readBytes)
fmt.Fprintf(w, "process_io_storage_written_bytes_total %d\n", writeBytes)
}
var startTimeSeconds = time.Now().Unix()