Imp: set gr number by proc number instead of cpu number

sync/task_pool.go

@@ -238,7 +238,7 @@ type taskPoolSimple struct {
 // NewTaskPoolSimple build a simple task pool
 func NewTaskPoolSimple(size int) GenericTaskPool {
 	if size < 1 {
-		size = runtime.NumCPU() * 100
+		size = runtime.GOMAXPROCS(-1) * 100
 	}
 	return &taskPoolSimple{
 		work: make(chan task),