Got it! Thanks On Tue, Dec 13, 2016 at 11:35 AM, Dave Cheney <d...@cheney.net> wrote:
> > > On Tuesday, 13 December 2016 19:20:04 UTC+11, Stannis Kozlov wrote: >> >> Thanks for reply, Dave >> >> I've made simple application and run it on Xeon and i5. In case of i5 I >> see threads as expected, on Xeon CPU only one thread is working. May it >> related with difference go versions? >> > > yes, this is why. > > Before Go 1.5, Go defaulted to one CPU by default. https://golang.org/ > doc/go1.5 > > You should upgrade to Go 1.7.4 and prepare to upgrade to Go 1.8 early next > year. You are using ancient and unsupported versions of Go. > https://github.com/golang/go/wiki/Go-Release-Cycle#release-maintenance > > >> >> i5 output (go version 1.6): >> $ go run test_tr.go >> Spinning thread >> Spinning thread >> Spinning thread >> Spinning thread >> Spinning thread >> Thread: 4 >> Thread: 1 >> Thread: 0 >> Thread: 2 >> >> >> Xeon output (go version 1.2.1): >> $ go run test_tr.go >> Spinning thread >> Thread: 0 >> ^Cexit status 2 >> >> >> >> >> Code listing: >> package main >> >> >> import ( >> "fmt" >> "math" >> "sync" >> ) >> >> >> func A1(z int, wg *sync.WaitGroup) { >> fmt.Printf("Thread: %v\n",z) >> var m, k float64 = 9.99999,9.999999 >> var i float64 >> for i = 0.0; i < 10000000000; i++ { >> math.Sqrt(float64(m*i + k*i)) >> } >> wg.Done() >> } >> >> >> func main() { >> var wg sync.WaitGroup >> for i := 0; i < 5; i++ { >> wg.Add(1) >> go A1(i, &wg) >> fmt.Println("Spinning thread") >> } >> wg.Wait() >> } >> >> >> On Tuesday, December 13, 2016 at 12:56:50 AM UTC+3, Dave Cheney wrote: >>> >>> There are no settings to affect the scheduler save GOMAXPROCS. Check >>> that none of your code or your dependencies are calling runtime.GOMAXPROCS. >>> >>> If that doesn't help, try profiling your application, the cpu or block >>> profile might tell you where your program is hitting a point of contention. >>> >>> -- > You received this message because you are subscribed to a topic in the > Google Groups "golang-nuts" group. > To unsubscribe from this topic, visit https://groups.google.com/d/ > topic/golang-nuts/bh_FPjPCu-M/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
