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Merge pull request #30 from rogerwelin/histogram
histogram generation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| package client | ||
|
|
||
| import ( | ||
| "image/color" | ||
| "math" | ||
|
|
||
| "gonum.org/v1/plot" | ||
| "gonum.org/v1/plot/plotter" | ||
| ) | ||
|
|
||
| func getBins(dataPoints int) int { | ||
| b := int(math.RoundToEven(math.Sqrt(float64(dataPoints)))) | ||
| return b | ||
| } | ||
|
|
||
| // PlotHistogram blabla | ||
| func (c *Cassowary) PlotHistogram(durations []float64) error { | ||
|
|
||
| bins := getBins(len(durations)) | ||
| if bins == 0 { | ||
| return nil | ||
| } | ||
|
|
||
| // remove outliers | ||
| avg := calcMean(durations) | ||
| stddev := calcStdDev(durations) | ||
| outliers := avg + 1.95*stddev | ||
|
|
||
| for i := len(durations) - 1; i >= 0; i-- { | ||
| if durations[i] > outliers { | ||
| durations = append(durations[:i], durations[i+1:]...) | ||
| } | ||
| } | ||
|
|
||
| vs := make(plotter.Values, len(durations)) | ||
| for i, d := range durations { | ||
| vs[i] = d | ||
| } | ||
|
|
||
| h, err := plotter.NewHist(vs, bins) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| p, err := plot.New() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| p.Add(h) | ||
| p.Title.Text = "Distribution" | ||
| p.Y.Label.Text = "Requests" | ||
| p.X.Label.Text = "ms" | ||
| h.FillColor = color.RGBA{R: 70, G: 130, B: 180, A: 1} | ||
| h.Color = color.Opaque | ||
|
|
||
| if err := p.Save(512, 512, "hist.png"); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| package client | ||
|
|
||
| import ( | ||
| "math/rand" | ||
| "os" | ||
| "testing" | ||
| "time" | ||
| ) | ||
|
|
||
| var testBins = []struct { | ||
| in int | ||
| expectedBins int | ||
| }{ | ||
| {10, 3}, | ||
| {100, 10}, | ||
| {250, 16}, | ||
| {500, 22}, | ||
| {750, 27}, | ||
| {1000, 32}, | ||
| } | ||
|
|
||
| func TestBins(t *testing.T) { | ||
| for i, tt := range testBins { | ||
| actual := getBins(tt.in) | ||
| if actual != tt.expectedBins { | ||
| t.Errorf("test: %d, getBins(%d): expected %d, actual %d", i+1, tt.in, tt.expectedBins, actual) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func TestHistOutput(t *testing.T) { | ||
| num := 100 | ||
| res := make([]float64, num) | ||
| filename := "hist.png" | ||
| cass := &Cassowary{} | ||
| rand.Seed(time.Now().UnixNano()) | ||
|
|
||
| for i := 0; i < num; i++ { | ||
| res = append(res, rand.Float64()*(200.0-10.0)) | ||
| } | ||
|
|
||
| err := cass.PlotHistogram(res) | ||
| if err != nil { | ||
| t.Errorf("Expected ok but got: %v", err) | ||
| } | ||
| _, err = os.Stat(filename) | ||
| if os.IsNotExist(err) { | ||
| t.Errorf("Expected %s in current dir but got: %v", filename, err) | ||
| } | ||
|
|
||
| _ = os.Remove(filename) | ||
| } |
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