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lib/cgroup: limit the maximum GOMAXPROCS value to the number of available CPU cores

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There is no sense in setting GOMAXPROCS to value higher than the number of available CPU cores.
This commit is contained in:
Aliaksandr Valialkin 2020-08-28 09:40:53 +03:00
parent 08b76cb26f
commit 45e770ed20
1 changed files with 8 additions and 0 deletions
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8
lib/cgroup/cpu.go
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@ -12,6 +12,8 @@ import (
// This function must be called after logger.Init(). // This function must be called after logger.Init().
func UpdateGOMAXPROCSToCPUQuota() { func UpdateGOMAXPROCSToCPUQuota() {
if v := os.Getenv("GOMAXPROCS"); v != "" { if v := os.Getenv("GOMAXPROCS"); v != "" {
// Do not override explicitly set GOMAXPROCS.
logger.Infof("using GOMAXPROCS=%q set via environment variable", v)
return return
} }
q := getCPUQuota() q := getCPUQuota()
@ -20,6 +22,12 @@ func UpdateGOMAXPROCSToCPUQuota() {
return return
} }
gomaxprocs := int(q + 0.5) 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 { if gomaxprocs <= 0 {
gomaxprocs = 1 gomaxprocs = 1
} }