I make a test to see the performance of select, and found the result is not
good.
I make 1000 SeqQueue objects and run its messageLoop function (which does a
small piece of work, and is listed as below) in 1000 separate go routines.
The CPU cost is more than 20%.
If I make the ticker 1 second, the CPU cost can slow down to about 2%.
With pprof, I see the most top cost are methods related to
runtime.selectGo, runtime.lock.
Who knows is there anything wrong in my case?
func (this *SeqQueue) messageLoop() {
var ticker = time.NewTicker(100 * time.Millisecond)
defer ticker.Stop()
for {
select {
case <-serverDone:
return
case <-this.done:
return
case <-ticker.C:
this.tickCounter += 1
case message := <-this.messages:
this.messageCounter += 1
_ = message
}
}
}
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