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Fix utils.AdjustGoMaxProcs

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Since Go 1.5, Go will use the total number of logical processers that the
system has available. Caveats to this are if someone has set the
GOMAXPROCS env var set or wish to limit usage of the number of logical processers
between a range from 1 to NumCPUs
This commit is contained in:
Adrian Gallagher
2019-10-03 10:12:44 +10:00
parent db317a2447
commit 8ca1e5c36f
4 changed files with 68 additions and 16 deletions
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23
utils/utils.go
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@@ -16,16 +16,29 @@ var (
)
// AdjustGoMaxProcs sets the runtime GOMAXPROCS val
func AdjustGoMaxProcs(maxProcs int) error {
// Since Go 1.5, Go will use the total number of logical processers that the
// system has available. Caveats to this are if someone has set the GOMAXPROCS
// env var set or wish to limit usage of the number of logical processers
// between a range from 1 to NumCPUs
func AdjustGoMaxProcs(procs int) error {
// Check for default settings, plus respecting GOMAXPROCS env but
// don't allow for values which will cause thread contention
n := runtime.NumCPU()
if maxProcs < 0 || maxProcs > n {
maxProcs = n
if procs == runtime.GOMAXPROCS(-1) {
if procs <= n {
return nil
}
}
if i := runtime.GOMAXPROCS(maxProcs); i != maxProcs {
// Sanitise the procs value (defaults to NumCPUs)
if procs < 1 || procs > n {
procs = n
}
runtime.GOMAXPROCS(procs)
if i := runtime.GOMAXPROCS(procs); i != procs {
return ErrGoMaxProcsFailure
}
return nil
}