add TestFrequencySimple

Author: batmac

tsc.go

@@ -23,10 +23,12 @@ func Ticks() uint64
 func Cpuid()
 
 // Frequency returns your TSC frequency
-// will take n*period to find out
+// will take the max on "n" tries and
+// will take "period" to find out
 func Frequency(n int, period time.Duration) float64 {
 	var startTime, endTime time.Time
 	var startCounter, endCounter uint64
+	period /= time.Duration(n)
 	freq := 0.0
 	for i := 0; i < n; i++ {
 		startTime = time.Now()

tsc_test.go

@@ -132,6 +132,18 @@ func TestCPUIDOverhead(t *testing.T) {
 		Cpuid()
 	})
 }
+func TestFrequencySimple(t *testing.T) {
+	f := Frequency(1, time.Second)
+	t.Logf("Frequency found: %.2e", f)
+	if f <= 0 {
+		t.Fail()
+	}
+	f = Frequency(maxIter, time.Second)
+	t.Logf("Frequency found with %d tries: %.2e", maxIter, f)
+	if f <= 0 {
+		t.Fail()
+	}
+}
 func TestFrequency(t *testing.T) {
 	s := make([]float64, maxIter)
 	for i := 0; i < maxIter; i++ {