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add an option to enable the runtime mutex profiling #4031

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Jun 21, 2018
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add an option to enable the runtime mutex profiling #4031

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12 changes: 9 additions & 3 deletions go/vt/servenv/servenv.go
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Original file line number Diff line number Diff line change
Expand Up @@ -55,9 +55,10 @@ var (
Port *int

// Flags to alter the behavior of the library.
lameduckPeriod = flag.Duration("lameduck-period", 50*time.Millisecond, "keep running at least this long after SIGTERM before stopping")
onTermTimeout = flag.Duration("onterm_timeout", 10*time.Second, "wait no more than this for OnTermSync handlers before stopping")
memProfileRate = flag.Int("mem-profile-rate", 512*1024, "profile every n bytes allocated")
lameduckPeriod = flag.Duration("lameduck-period", 50*time.Millisecond, "keep running at least this long after SIGTERM before stopping")
onTermTimeout = flag.Duration("onterm_timeout", 10*time.Second, "wait no more than this for OnTermSync handlers before stopping")
memProfileRate = flag.Int("mem-profile-rate", 512*1024, "profile every n bytes allocated")
mutexProfileFraction = flag.Int("mutex-profile-fraction", 0, "profile every n mutex contention events (see runtime.SetMutexProfileFraction)")

// mutex used to protect the Init function
mu sync.Mutex
Expand Down Expand Up @@ -89,6 +90,11 @@ func Init() {

runtime.MemProfileRate = *memProfileRate

if *mutexProfileFraction != 0 {
log.Infof("setting mutex profile fraction to %v", *mutexProfileFraction)
runtime.SetMutexProfileFraction(*mutexProfileFraction)
}

// We used to set this limit directly, but you pretty much have to
// use a root account to allow increasing a limit reliably. Dropping
// privileges is also tricky. The best strategy is to make a shell
Expand Down