mirror of
https://github.com/octoleo/restic.git
synced 2024-11-30 08:44:02 +00:00
326 lines
7.4 KiB
Go
326 lines
7.4 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package trace
|
|
|
|
import (
|
|
"math"
|
|
"testing"
|
|
)
|
|
|
|
type sumTest struct {
|
|
value int64
|
|
sum int64
|
|
sumOfSquares float64
|
|
total int64
|
|
}
|
|
|
|
var sumTests = []sumTest{
|
|
{100, 100, 10000, 1},
|
|
{50, 150, 12500, 2},
|
|
{50, 200, 15000, 3},
|
|
{50, 250, 17500, 4},
|
|
}
|
|
|
|
type bucketingTest struct {
|
|
in int64
|
|
log int
|
|
bucket int
|
|
}
|
|
|
|
var bucketingTests = []bucketingTest{
|
|
{0, 0, 0},
|
|
{1, 1, 0},
|
|
{2, 2, 1},
|
|
{3, 2, 1},
|
|
{4, 3, 2},
|
|
{1000, 10, 9},
|
|
{1023, 10, 9},
|
|
{1024, 11, 10},
|
|
{1000000, 20, 19},
|
|
}
|
|
|
|
type multiplyTest struct {
|
|
in int64
|
|
ratio float64
|
|
expectedSum int64
|
|
expectedTotal int64
|
|
expectedSumOfSquares float64
|
|
}
|
|
|
|
var multiplyTests = []multiplyTest{
|
|
{15, 2.5, 37, 2, 562.5},
|
|
{128, 4.6, 758, 13, 77953.9},
|
|
}
|
|
|
|
type percentileTest struct {
|
|
fraction float64
|
|
expected int64
|
|
}
|
|
|
|
var percentileTests = []percentileTest{
|
|
{0.25, 48},
|
|
{0.5, 96},
|
|
{0.6, 109},
|
|
{0.75, 128},
|
|
{0.90, 205},
|
|
{0.95, 230},
|
|
{0.99, 256},
|
|
}
|
|
|
|
func TestSum(t *testing.T) {
|
|
var h histogram
|
|
|
|
for _, test := range sumTests {
|
|
h.addMeasurement(test.value)
|
|
sum := h.sum
|
|
if sum != test.sum {
|
|
t.Errorf("h.Sum = %v WANT: %v", sum, test.sum)
|
|
}
|
|
|
|
sumOfSquares := h.sumOfSquares
|
|
if sumOfSquares != test.sumOfSquares {
|
|
t.Errorf("h.SumOfSquares = %v WANT: %v", sumOfSquares, test.sumOfSquares)
|
|
}
|
|
|
|
total := h.total()
|
|
if total != test.total {
|
|
t.Errorf("h.Total = %v WANT: %v", total, test.total)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestMultiply(t *testing.T) {
|
|
var h histogram
|
|
for i, test := range multiplyTests {
|
|
h.addMeasurement(test.in)
|
|
h.Multiply(test.ratio)
|
|
if h.sum != test.expectedSum {
|
|
t.Errorf("#%v: h.sum = %v WANT: %v", i, h.sum, test.expectedSum)
|
|
}
|
|
if h.total() != test.expectedTotal {
|
|
t.Errorf("#%v: h.total = %v WANT: %v", i, h.total(), test.expectedTotal)
|
|
}
|
|
if h.sumOfSquares != test.expectedSumOfSquares {
|
|
t.Errorf("#%v: h.SumOfSquares = %v WANT: %v", i, test.expectedSumOfSquares, h.sumOfSquares)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestBucketingFunctions(t *testing.T) {
|
|
for _, test := range bucketingTests {
|
|
log := log2(test.in)
|
|
if log != test.log {
|
|
t.Errorf("log2 = %v WANT: %v", log, test.log)
|
|
}
|
|
|
|
bucket := getBucket(test.in)
|
|
if bucket != test.bucket {
|
|
t.Errorf("getBucket = %v WANT: %v", bucket, test.bucket)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestAverage(t *testing.T) {
|
|
a := new(histogram)
|
|
average := a.average()
|
|
if average != 0 {
|
|
t.Errorf("Average of empty histogram was %v WANT: 0", average)
|
|
}
|
|
|
|
a.addMeasurement(1)
|
|
a.addMeasurement(1)
|
|
a.addMeasurement(3)
|
|
const expected = float64(5) / float64(3)
|
|
average = a.average()
|
|
|
|
if !isApproximate(average, expected) {
|
|
t.Errorf("Average = %g WANT: %v", average, expected)
|
|
}
|
|
}
|
|
|
|
func TestStandardDeviation(t *testing.T) {
|
|
a := new(histogram)
|
|
add(a, 10, 1<<4)
|
|
add(a, 10, 1<<5)
|
|
add(a, 10, 1<<6)
|
|
stdDev := a.standardDeviation()
|
|
const expected = 19.95
|
|
|
|
if !isApproximate(stdDev, expected) {
|
|
t.Errorf("StandardDeviation = %v WANT: %v", stdDev, expected)
|
|
}
|
|
|
|
// No values
|
|
a = new(histogram)
|
|
stdDev = a.standardDeviation()
|
|
|
|
if !isApproximate(stdDev, 0) {
|
|
t.Errorf("StandardDeviation = %v WANT: 0", stdDev)
|
|
}
|
|
|
|
add(a, 1, 1<<4)
|
|
if !isApproximate(stdDev, 0) {
|
|
t.Errorf("StandardDeviation = %v WANT: 0", stdDev)
|
|
}
|
|
|
|
add(a, 10, 1<<4)
|
|
if !isApproximate(stdDev, 0) {
|
|
t.Errorf("StandardDeviation = %v WANT: 0", stdDev)
|
|
}
|
|
}
|
|
|
|
func TestPercentileBoundary(t *testing.T) {
|
|
a := new(histogram)
|
|
add(a, 5, 1<<4)
|
|
add(a, 10, 1<<6)
|
|
add(a, 5, 1<<7)
|
|
|
|
for _, test := range percentileTests {
|
|
percentile := a.percentileBoundary(test.fraction)
|
|
if percentile != test.expected {
|
|
t.Errorf("h.PercentileBoundary (fraction=%v) = %v WANT: %v", test.fraction, percentile, test.expected)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestCopyFrom(t *testing.T) {
|
|
a := histogram{5, 25, []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
|
|
19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38}, 4, -1}
|
|
b := histogram{6, 36, []int64{2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
|
|
20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39}, 5, -1}
|
|
|
|
a.CopyFrom(&b)
|
|
|
|
if a.String() != b.String() {
|
|
t.Errorf("a.String = %s WANT: %s", a.String(), b.String())
|
|
}
|
|
}
|
|
|
|
func TestClear(t *testing.T) {
|
|
a := histogram{5, 25, []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
|
|
19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38}, 4, -1}
|
|
|
|
a.Clear()
|
|
|
|
expected := "0, 0.000000, 0, 0, []"
|
|
if a.String() != expected {
|
|
t.Errorf("a.String = %s WANT %s", a.String(), expected)
|
|
}
|
|
}
|
|
|
|
func TestNew(t *testing.T) {
|
|
a := histogram{5, 25, []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
|
|
19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38}, 4, -1}
|
|
b := a.New()
|
|
|
|
expected := "0, 0.000000, 0, 0, []"
|
|
if b.(*histogram).String() != expected {
|
|
t.Errorf("b.(*histogram).String = %s WANT: %s", b.(*histogram).String(), expected)
|
|
}
|
|
}
|
|
|
|
func TestAdd(t *testing.T) {
|
|
// The tests here depend on the associativity of addMeasurement and Add.
|
|
// Add empty observation
|
|
a := histogram{5, 25, []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
|
|
19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38}, 4, -1}
|
|
b := a.New()
|
|
|
|
expected := a.String()
|
|
a.Add(b)
|
|
if a.String() != expected {
|
|
t.Errorf("a.String = %s WANT: %s", a.String(), expected)
|
|
}
|
|
|
|
// Add same bucketed value, no new buckets
|
|
c := new(histogram)
|
|
d := new(histogram)
|
|
e := new(histogram)
|
|
c.addMeasurement(12)
|
|
d.addMeasurement(11)
|
|
e.addMeasurement(12)
|
|
e.addMeasurement(11)
|
|
c.Add(d)
|
|
if c.String() != e.String() {
|
|
t.Errorf("c.String = %s WANT: %s", c.String(), e.String())
|
|
}
|
|
|
|
// Add bucketed values
|
|
f := new(histogram)
|
|
g := new(histogram)
|
|
h := new(histogram)
|
|
f.addMeasurement(4)
|
|
f.addMeasurement(12)
|
|
f.addMeasurement(100)
|
|
g.addMeasurement(18)
|
|
g.addMeasurement(36)
|
|
g.addMeasurement(255)
|
|
h.addMeasurement(4)
|
|
h.addMeasurement(12)
|
|
h.addMeasurement(100)
|
|
h.addMeasurement(18)
|
|
h.addMeasurement(36)
|
|
h.addMeasurement(255)
|
|
f.Add(g)
|
|
if f.String() != h.String() {
|
|
t.Errorf("f.String = %q WANT: %q", f.String(), h.String())
|
|
}
|
|
|
|
// add buckets to no buckets
|
|
i := new(histogram)
|
|
j := new(histogram)
|
|
k := new(histogram)
|
|
j.addMeasurement(18)
|
|
j.addMeasurement(36)
|
|
j.addMeasurement(255)
|
|
k.addMeasurement(18)
|
|
k.addMeasurement(36)
|
|
k.addMeasurement(255)
|
|
i.Add(j)
|
|
if i.String() != k.String() {
|
|
t.Errorf("i.String = %q WANT: %q", i.String(), k.String())
|
|
}
|
|
|
|
// add buckets to single value (no overlap)
|
|
l := new(histogram)
|
|
m := new(histogram)
|
|
n := new(histogram)
|
|
l.addMeasurement(0)
|
|
m.addMeasurement(18)
|
|
m.addMeasurement(36)
|
|
m.addMeasurement(255)
|
|
n.addMeasurement(0)
|
|
n.addMeasurement(18)
|
|
n.addMeasurement(36)
|
|
n.addMeasurement(255)
|
|
l.Add(m)
|
|
if l.String() != n.String() {
|
|
t.Errorf("l.String = %q WANT: %q", l.String(), n.String())
|
|
}
|
|
|
|
// mixed order
|
|
o := new(histogram)
|
|
p := new(histogram)
|
|
o.addMeasurement(0)
|
|
o.addMeasurement(2)
|
|
o.addMeasurement(0)
|
|
p.addMeasurement(0)
|
|
p.addMeasurement(0)
|
|
p.addMeasurement(2)
|
|
if o.String() != p.String() {
|
|
t.Errorf("o.String = %q WANT: %q", o.String(), p.String())
|
|
}
|
|
}
|
|
|
|
func add(h *histogram, times int, val int64) {
|
|
for i := 0; i < times; i++ {
|
|
h.addMeasurement(val)
|
|
}
|
|
}
|
|
|
|
func isApproximate(x, y float64) bool {
|
|
return math.Abs(x-y) < 1e-2
|
|
}
|