mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-21 14:44:00 +00:00
f4c4ab811b
There is no sense in setting GOMAXPROCS to value higher than the number of available CPU cores.
48 lines
1.4 KiB
Go
48 lines
1.4 KiB
Go
package cgroup
|
|
|
|
import (
|
|
"os"
|
|
"runtime"
|
|
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
|
|
)
|
|
|
|
// UpdateGOMAXPROCSToCPUQuota updates GOMAXPROCS to cgroup CPU quota if GOMAXPROCS isn't set in environment var.
|
|
//
|
|
// This function must be called after logger.Init().
|
|
func UpdateGOMAXPROCSToCPUQuota() {
|
|
if v := os.Getenv("GOMAXPROCS"); v != "" {
|
|
// Do not override explicitly set GOMAXPROCS.
|
|
logger.Infof("using GOMAXPROCS=%q set via environment variable", v)
|
|
return
|
|
}
|
|
q := getCPUQuota()
|
|
if q <= 0 {
|
|
// Do not change GOMAXPROCS
|
|
return
|
|
}
|
|
gomaxprocs := int(q + 0.5)
|
|
numCPU := runtime.NumCPU()
|
|
if gomaxprocs > numCPU {
|
|
// There is no sense in setting more GOMAXPROCS than the number of available CPU cores.
|
|
logger.Infof("cgroup CPU quota=%d exceeds NumCPU=%d; using GOMAXPROCS=NumCPU", gomaxprocs, numCPU)
|
|
return
|
|
}
|
|
if gomaxprocs <= 0 {
|
|
gomaxprocs = 1
|
|
}
|
|
logger.Infof("updating GOMAXPROCS to %d according to cgroup CPU quota", gomaxprocs)
|
|
runtime.GOMAXPROCS(gomaxprocs)
|
|
}
|
|
|
|
func getCPUQuota() float64 {
|
|
quotaUS, err := readInt64("/sys/fs/cgroup/cpu/cpu.cfs_quota_us", "cat /sys/fs/cgroup/cpu$(cat /proc/self/cgroup | grep cpu, | cut -d: -f3)/cpu.cfs_quota_us")
|
|
if err != nil {
|
|
return 0
|
|
}
|
|
periodUS, err := readInt64("/sys/fs/cgroup/cpu/cpu.cfs_period_us", "cat /sys/fs/cgroup/cpu$(cat /proc/self/cgroup | grep cpu, | cut -d: -f3)/cpu.cfs_period_us")
|
|
if err != nil {
|
|
return 0
|
|
}
|
|
return float64(quotaUS) / float64(periodUS)
|
|
}
|