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remove cgo dependency

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by hardcoding `USER_HZ` (aka. `_SC_CLK_TCK`) to 100, which it is for all
platforms Go supports. See prometheus/node_exporter#52 for discussion around this too.

Closes prometheus/node_exporter#52.
This commit is contained in:
Matthias Rampke 2015-05-12 14:24:48 +00:00
parent b4f40ab13f
commit 2ee8470004
1 changed files with 4 additions and 6 deletions
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10
collector/stat.go
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@ -11,11 +11,9 @@ import (
"github.com/prometheus/client_golang/prometheus" "github.com/prometheus/client_golang/prometheus"
) )
// #include <unistd.h>
import "C"
const ( const (
procStat = "/proc/stat" procStat = "/proc/stat"
userHz = 100
) )
type statCollector struct { type statCollector struct {
@ -102,17 +100,17 @@ func (c *statCollector) Update(ch chan<- prometheus.Metric) (err error) {
// Only some of these may be present, depending on kernel version. // Only some of these may be present, depending on kernel version.
cpuFields := []string{"user", "nice", "system", "idle", "iowait", "irq", "softirq", "steal", "guest"} cpuFields := []string{"user", "nice", "system", "idle", "iowait", "irq", "softirq", "steal", "guest"}
// OpenVZ guests lack the "guest" CPU field, which needs to be ignored. // OpenVZ guests lack the "guest" CPU field, which needs to be ignored.
expectedFieldNum := len(cpuFields)+1 expectedFieldNum := len(cpuFields) + 1
if expectedFieldNum > len(parts) { if expectedFieldNum > len(parts) {
expectedFieldNum = len(parts) expectedFieldNum = len(parts)
} }
for i, v := range parts[1 : expectedFieldNum] { for i, v := range parts[1:expectedFieldNum] {
value, err := strconv.ParseFloat(v, 64) value, err := strconv.ParseFloat(v, 64)
if err != nil { if err != nil {
return err return err
} }
// Convert from ticks to seconds // Convert from ticks to seconds
value /= float64(C.sysconf(C._SC_CLK_TCK)) value /= userHz
c.cpu.With(prometheus.Labels{"cpu": parts[0], "mode": cpuFields[i]}).Set(value) c.cpu.With(prometheus.Labels{"cpu": parts[0], "mode": cpuFields[i]}).Set(value)
} }
case parts[0] == "intr": case parts[0] == "intr":