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Copy pathexecution_segment_test.go
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execution_segment_test.go
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/*
*
* k6 - a next-generation load testing tool
* Copyright (C) 2019 Load Impact
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package lib
import (
"fmt"
"math/big"
"math/rand"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func stringToES(t *testing.T, str string) *ExecutionSegment {
es := new(ExecutionSegment)
require.NoError(t, es.UnmarshalText([]byte(str)))
return es
}
func TestExecutionSegmentEquals(t *testing.T) {
t.Parallel()
t.Run("nil segment to full", func(t *testing.T) {
var nilEs *ExecutionSegment
fullEs := stringToES(t, "0:1")
require.True(t, nilEs.Equal(fullEs))
require.True(t, fullEs.Equal(nilEs))
})
t.Run("To it's self", func(t *testing.T) {
es := stringToES(t, "1/2:2/3")
require.True(t, es.Equal(es))
})
}
func TestExecutionSegmentNew(t *testing.T) {
t.Parallel()
t.Run("from is below zero", func(t *testing.T) {
_, err := NewExecutionSegment(big.NewRat(-1, 1), big.NewRat(1, 1))
require.Error(t, err)
})
t.Run("to is more than 1", func(t *testing.T) {
_, err := NewExecutionSegment(big.NewRat(0, 1), big.NewRat(2, 1))
require.Error(t, err)
})
t.Run("from is smaller than to", func(t *testing.T) {
_, err := NewExecutionSegment(big.NewRat(1, 2), big.NewRat(1, 3))
require.Error(t, err)
})
t.Run("from is equal to 'to'", func(t *testing.T) {
_, err := NewExecutionSegment(big.NewRat(1, 2), big.NewRat(1, 2))
require.Error(t, err)
})
t.Run("ok", func(t *testing.T) {
_, err := NewExecutionSegment(big.NewRat(0, 1), big.NewRat(1, 1))
require.NoError(t, err)
})
}
func TestExecutionSegmentUnmarshalText(t *testing.T) {
t.Parallel()
testCases := []struct {
input string
output *ExecutionSegment
isErr bool
}{
{input: "0:1", output: &ExecutionSegment{from: zeroRat, to: oneRat}},
{input: "0.5:0.75", output: &ExecutionSegment{from: big.NewRat(1, 2), to: big.NewRat(3, 4)}},
{input: "1/2:3/4", output: &ExecutionSegment{from: big.NewRat(1, 2), to: big.NewRat(3, 4)}},
{input: "50%:75%", output: &ExecutionSegment{from: big.NewRat(1, 2), to: big.NewRat(3, 4)}},
{input: "2/4:75%", output: &ExecutionSegment{from: big.NewRat(1, 2), to: big.NewRat(3, 4)}},
{input: "75%", output: &ExecutionSegment{from: zeroRat, to: big.NewRat(3, 4)}},
{input: "125%", isErr: true},
{input: "1a5%", isErr: true},
{input: "1a5", isErr: true},
{input: "1a5%:2/3", isErr: true},
{input: "125%:250%", isErr: true},
{input: "55%:50%", isErr: true},
// TODO add more strange or not so strange cases
}
for _, testCase := range testCases {
testCase := testCase
t.Run(testCase.input, func(t *testing.T) {
es := new(ExecutionSegment)
err := es.UnmarshalText([]byte(testCase.input))
if testCase.isErr {
require.Error(t, err)
return
}
require.NoError(t, err)
require.True(t, es.Equal(testCase.output))
// see if unmarshalling a stringified segment gets you back the same segment
err = es.UnmarshalText([]byte(es.String()))
require.NoError(t, err)
require.True(t, es.Equal(testCase.output))
})
}
t.Run("Unmarshal nilSegment.String", func(t *testing.T) {
var nilEs *ExecutionSegment
nilEsStr := nilEs.String()
require.Equal(t, "0:1", nilEsStr)
es := new(ExecutionSegment)
err := es.UnmarshalText([]byte(nilEsStr))
require.NoError(t, err)
require.True(t, es.Equal(nilEs))
})
}
func TestExecutionSegmentSplit(t *testing.T) {
t.Parallel()
var nilEs *ExecutionSegment
_, err := nilEs.Split(-1)
require.Error(t, err)
_, err = nilEs.Split(0)
require.Error(t, err)
segments, err := nilEs.Split(1)
require.NoError(t, err)
require.Len(t, segments, 1)
assert.Equal(t, "0:1", segments[0].String())
segments, err = nilEs.Split(2)
require.NoError(t, err)
require.Len(t, segments, 2)
assert.Equal(t, "0:1/2", segments[0].String())
assert.Equal(t, "1/2:1", segments[1].String())
segments, err = nilEs.Split(3)
require.NoError(t, err)
require.Len(t, segments, 3)
assert.Equal(t, "0:1/3", segments[0].String())
assert.Equal(t, "1/3:2/3", segments[1].String())
assert.Equal(t, "2/3:1", segments[2].String())
secondQuarter, err := NewExecutionSegment(big.NewRat(1, 4), big.NewRat(2, 4))
require.NoError(t, err)
segments, err = secondQuarter.Split(1)
require.NoError(t, err)
require.Len(t, segments, 1)
assert.Equal(t, "1/4:1/2", segments[0].String())
segments, err = secondQuarter.Split(2)
require.NoError(t, err)
require.Len(t, segments, 2)
assert.Equal(t, "1/4:3/8", segments[0].String())
assert.Equal(t, "3/8:1/2", segments[1].String())
segments, err = secondQuarter.Split(3)
require.NoError(t, err)
require.Len(t, segments, 3)
assert.Equal(t, "1/4:1/3", segments[0].String())
assert.Equal(t, "1/3:5/12", segments[1].String())
assert.Equal(t, "5/12:1/2", segments[2].String())
segments, err = secondQuarter.Split(4)
require.NoError(t, err)
require.Len(t, segments, 4)
assert.Equal(t, "1/4:5/16", segments[0].String())
assert.Equal(t, "5/16:3/8", segments[1].String())
assert.Equal(t, "3/8:7/16", segments[2].String())
assert.Equal(t, "7/16:1/2", segments[3].String())
}
func TestExecutionSegmentFailures(t *testing.T) {
t.Parallel()
es := new(ExecutionSegment)
require.NoError(t, es.UnmarshalText([]byte("0:0.25")))
require.Equal(t, int64(1), es.Scale(2))
require.Equal(t, int64(1), es.Scale(3))
require.NoError(t, es.UnmarshalText([]byte("0.25:0.5")))
require.Equal(t, int64(0), es.Scale(2))
require.Equal(t, int64(1), es.Scale(3))
require.NoError(t, es.UnmarshalText([]byte("0.5:0.75")))
require.Equal(t, int64(1), es.Scale(2))
require.Equal(t, int64(0), es.Scale(3))
require.NoError(t, es.UnmarshalText([]byte("0.75:1")))
require.Equal(t, int64(0), es.Scale(2))
require.Equal(t, int64(1), es.Scale(3))
}
func TestExecutionTupleScale(t *testing.T) {
t.Parallel()
es := new(ExecutionSegment)
require.NoError(t, es.UnmarshalText([]byte("0.5")))
et, err := NewExecutionTuple(es, nil)
require.NoError(t, err)
require.Equal(t, int64(1), et.ScaleInt64(2))
require.Equal(t, int64(2), et.ScaleInt64(3))
require.NoError(t, es.UnmarshalText([]byte("0.5:1.0")))
et, err = NewExecutionTuple(es, nil)
require.NoError(t, err)
require.Equal(t, int64(1), et.ScaleInt64(2))
require.Equal(t, int64(1), et.ScaleInt64(3))
ess, err := NewExecutionSegmentSequenceFromString("0,0.5,1")
require.NoError(t, err)
require.NoError(t, es.UnmarshalText([]byte("0.5")))
et, err = NewExecutionTuple(es, &ess)
require.NoError(t, err)
require.Equal(t, int64(1), et.ScaleInt64(2))
require.Equal(t, int64(2), et.ScaleInt64(3))
require.NoError(t, es.UnmarshalText([]byte("0.5:1.0")))
et, err = NewExecutionTuple(es, &ess)
require.NoError(t, err)
require.Equal(t, int64(1), et.ScaleInt64(2))
require.Equal(t, int64(1), et.ScaleInt64(3))
}
func TestBigScale(t *testing.T) {
es := new(ExecutionSegment)
ess, err := NewExecutionSegmentSequenceFromString("0,7/20,7/10,1")
require.NoError(t, err)
require.NoError(t, es.UnmarshalText([]byte("0:7/20")))
et, err := NewExecutionTuple(es, &ess)
require.NoError(t, err)
require.Equal(t, int64(18), et.ScaleInt64(50))
}
func TestExecutionSegmentCopyScaleRat(t *testing.T) {
t.Parallel()
es := new(ExecutionSegment)
twoRat := big.NewRat(2, 1)
threeRat := big.NewRat(3, 1)
require.NoError(t, es.UnmarshalText([]byte("0.5")))
require.Equal(t, oneRat, es.CopyScaleRat(twoRat))
require.Equal(t, big.NewRat(3, 2), es.CopyScaleRat(threeRat))
require.NoError(t, es.UnmarshalText([]byte("0.5:1.0")))
require.Equal(t, oneRat, es.CopyScaleRat(twoRat))
require.Equal(t, big.NewRat(3, 2), es.CopyScaleRat(threeRat))
var nilEs *ExecutionSegment
require.Equal(t, twoRat, nilEs.CopyScaleRat(twoRat))
require.Equal(t, threeRat, nilEs.CopyScaleRat(threeRat))
}
func TestExecutionSegmentInPlaceScaleRat(t *testing.T) {
t.Parallel()
es := new(ExecutionSegment)
twoRat := big.NewRat(2, 1)
threeRat := big.NewRat(3, 1)
threeSecondsRat := big.NewRat(3, 2)
require.NoError(t, es.UnmarshalText([]byte("0.5")))
require.Equal(t, oneRat, es.InPlaceScaleRat(twoRat))
require.Equal(t, oneRat, twoRat)
require.Equal(t, threeSecondsRat, es.InPlaceScaleRat(threeRat))
require.Equal(t, threeSecondsRat, threeRat)
es = stringToES(t, "0.5:1.0")
twoRat = big.NewRat(2, 1)
threeRat = big.NewRat(3, 1)
require.Equal(t, oneRat, es.InPlaceScaleRat(twoRat))
require.Equal(t, oneRat, twoRat)
require.Equal(t, threeSecondsRat, es.InPlaceScaleRat(threeRat))
require.Equal(t, threeSecondsRat, threeRat)
var nilEs *ExecutionSegment
twoRat = big.NewRat(2, 1)
threeRat = big.NewRat(3, 1)
require.Equal(t, big.NewRat(2, 1), nilEs.InPlaceScaleRat(twoRat))
require.Equal(t, big.NewRat(2, 1), twoRat)
require.Equal(t, big.NewRat(3, 1), nilEs.InPlaceScaleRat(threeRat))
require.Equal(t, big.NewRat(3, 1), threeRat)
}
func TestExecutionSegmentSubSegment(t *testing.T) {
t.Parallel()
testCases := []struct {
name string
base, sub, result *ExecutionSegment
}{
// TODO add more strange or not so strange cases
{
name: "nil base",
base: (*ExecutionSegment)(nil),
sub: stringToES(t, "0.2:0.3"),
result: stringToES(t, "0.2:0.3"),
},
{
name: "nil sub",
base: stringToES(t, "0.2:0.3"),
sub: (*ExecutionSegment)(nil),
result: stringToES(t, "0.2:0.3"),
},
{
name: "doc example",
base: stringToES(t, "1/2:1"),
sub: stringToES(t, "0:1/2"),
result: stringToES(t, "1/2:3/4"),
},
}
for _, testCase := range testCases {
testCase := testCase
t.Run(testCase.name, func(t *testing.T) {
require.Equal(t, testCase.result, testCase.base.SubSegment(testCase.sub))
})
}
}
func TestSplitBadSegment(t *testing.T) {
t.Parallel()
es := &ExecutionSegment{from: oneRat, to: zeroRat}
_, err := es.Split(5)
require.Error(t, err)
}
func TestSegmentExecutionFloatLength(t *testing.T) {
t.Parallel()
t.Run("nil has 1.0", func(t *testing.T) {
var nilEs *ExecutionSegment
require.Equal(t, 1.0, nilEs.FloatLength())
})
testCases := []struct {
es *ExecutionSegment
expected float64
}{
// TODO add more strange or not so strange cases
{
es: stringToES(t, "1/2:1"),
expected: 0.5,
},
{
es: stringToES(t, "1/3:1"),
expected: 0.66666,
},
{
es: stringToES(t, "0:1/2"),
expected: 0.5,
},
}
for _, testCase := range testCases {
testCase := testCase
t.Run(testCase.es.String(), func(t *testing.T) {
require.InEpsilon(t, testCase.expected, testCase.es.FloatLength(), 0.001)
})
}
}
func TestExecutionSegmentSequences(t *testing.T) {
t.Parallel()
_, err := NewExecutionSegmentSequence(stringToES(t, "0:1/3"), stringToES(t, "1/2:1"))
assert.Error(t, err)
}
func TestExecutionSegmentStringSequences(t *testing.T) {
t.Parallel()
testCases := []struct {
seq string
expSegments []string
expError bool
canReverse bool
// TODO: checks for least common denominator and maybe striped partitioning
}{
{seq: "", expSegments: nil},
{seq: "0.5", expError: true},
{seq: "1,1", expError: true},
{seq: "-0.5,1", expError: true},
{seq: "1/2,1/2", expError: true},
{seq: "1/2,1/3", expError: true},
{seq: "0,1,1/2", expError: true},
{seq: "0.5,1", expSegments: []string{"1/2:1"}},
{seq: "1/2,1", expSegments: []string{"1/2:1"}, canReverse: true},
{seq: "1/3,2/3", expSegments: []string{"1/3:2/3"}, canReverse: true},
{seq: "0,1/3,2/3", expSegments: []string{"0:1/3", "1/3:2/3"}, canReverse: true},
{seq: "0,1/3,2/3,1", expSegments: []string{"0:1/3", "1/3:2/3", "2/3:1"}, canReverse: true},
{seq: "0.5,0.7", expSegments: []string{"1/2:7/10"}},
{seq: "0.5,0.7,1", expSegments: []string{"1/2:7/10", "7/10:1"}},
{seq: "0,1/13,2/13,1/3,1/2,3/4,1", expSegments: []string{
"0:1/13", "1/13:2/13", "2/13:1/3", "1/3:1/2", "1/2:3/4", "3/4:1",
}, canReverse: true},
}
for _, tc := range testCases {
tc := tc
t.Run(tc.seq, func(t *testing.T) {
result, err := NewExecutionSegmentSequenceFromString(tc.seq)
if tc.expError {
require.Error(t, err)
return
}
require.NoError(t, err)
require.Equal(t, len(tc.expSegments), len(result))
for i, expStrSeg := range tc.expSegments {
expSeg, errl := NewExecutionSegmentFromString(expStrSeg)
require.NoError(t, errl)
assert.Truef(t, expSeg.Equal(result[i]), "Segment %d (%s) should be equal to %s", i, result[i], expSeg)
}
if tc.canReverse {
assert.Equal(t, result.String(), tc.seq)
}
})
}
}
// Return a randomly distributed sequence of n amount of
// execution segments whose length totals 1.
func generateRandomSequence(t testing.TB, n, m int64, r *rand.Rand) ExecutionSegmentSequence {
var err error
ess := ExecutionSegmentSequence(make([]*ExecutionSegment, n))
numerators := make([]int64, n)
var denominator int64
for i := int64(0); i < n; i++ {
numerators[i] = 1 + r.Int63n(m)
denominator += numerators[i]
}
from := big.NewRat(0, 1)
for i := int64(0); i < n; i++ {
to := new(big.Rat).Add(big.NewRat(numerators[i], denominator), from)
ess[i], err = NewExecutionSegment(from, to)
require.NoError(t, err)
from = to
}
return ess
}
// Ensure that the sum of scaling all execution segments in
// the same sequence with scaling factor M results in M itself.
func TestExecutionSegmentScaleConsistency(t *testing.T) {
t.Parallel()
seed := time.Now().UnixNano()
r := rand.New(rand.NewSource(seed))
t.Logf("Random source seeded with %d\n", seed)
const numTests = 10
for i := 0; i < numTests; i++ {
scale := rand.Int31n(99) + 2
seq := generateRandomSequence(t, r.Int63n(9)+2, 100, r)
t.Run(fmt.Sprintf("%d_%s", scale, seq), func(t *testing.T) {
var total int64
for _, segment := range seq {
total += segment.Scale(int64(scale))
}
assert.Equal(t, int64(scale), total)
})
}
}
// Ensure that the sum of scaling all execution segments in
// the same sequence with scaling factor M results in M itself.
func TestExecutionTupleScaleConsistency(t *testing.T) {
t.Parallel()
seed := time.Now().UnixNano()
r := rand.New(rand.NewSource(seed))
t.Logf("Random source seeded with %d\n", seed)
const numTests = 10
for i := 0; i < numTests; i++ {
scale := rand.Int31n(99) + 2
seq := generateRandomSequence(t, r.Int63n(9)+2, 200, r)
et, err := NewExecutionTuple(seq[0], &seq)
require.NoError(t, err)
t.Run(fmt.Sprintf("%d_%s", scale, seq), func(t *testing.T) {
var total int64
for i, segment := range seq {
assert.True(t, segment.Equal(et.Sequence.ExecutionSegmentSequence[i]))
total += et.Sequence.ScaleInt64(i, int64(scale))
}
assert.Equal(t, int64(scale), total)
})
}
}
func TestExecutionSegmentScaleNoWobble(t *testing.T) {
t.Parallel()
requireSegmentScaleGreater := func(t *testing.T, et *ExecutionTuple) {
var i, lastResult int64
for i = 1; i < 1000; i++ {
result := et.ScaleInt64(i)
require.True(t, result >= lastResult, "%d<%d", result, lastResult)
lastResult = result
}
}
// Baseline full segment test
t.Run("0:1", func(t *testing.T) {
et, err := NewExecutionTuple(nil, nil)
require.NoError(t, err)
requireSegmentScaleGreater(t, et)
})
seed := time.Now().UnixNano()
r := rand.New(rand.NewSource(seed))
t.Logf("Random source seeded with %d\n", seed)
// Random segments
const numTests = 10
for i := 0; i < numTests; i++ {
seq := generateRandomSequence(t, r.Int63n(9)+2, 100, r)
es := seq[rand.Intn(len(seq))]
et, err := NewExecutionTuple(seq[0], &seq)
require.NoError(t, err)
t.Run(es.String(), func(t *testing.T) {
requireSegmentScaleGreater(t, et)
})
}
}
func TestGetStripedOffsets(t *testing.T) {
t.Parallel()
testCases := []struct {
seq string
seg string
start int64
offsets []int64
lcd int64
}{
// full sequences
{seq: "0,0.3,0.5,0.6,0.7,0.8,0.9,1", seg: "0:0.3", start: 0, offsets: []int64{4, 3, 3}, lcd: 10},
{seq: "0,0.3,0.5,0.6,0.7,0.8,0.9,1", seg: "0.3:0.5", start: 1, offsets: []int64{4, 6}, lcd: 10},
{seq: "0,0.3,0.5,0.6,0.7,0.8,0.9,1", seg: "0.5:0.6", start: 2, offsets: []int64{10}, lcd: 10},
{seq: "0,0.3,0.5,0.6,0.7,0.8,0.9,1", seg: "0.6:0.7", start: 3, offsets: []int64{10}, lcd: 10},
{seq: "0,0.3,0.5,0.6,0.7,0.8,0.9,1", seg: "0.8:0.9", start: 8, offsets: []int64{10}, lcd: 10},
{seq: "0,0.3,0.5,0.6,0.7,0.8,0.9,1", seg: "0.9:1", start: 9, offsets: []int64{10}, lcd: 10},
{seq: "0,0.2,0.5,0.6,0.7,0.8,0.9,1", seg: "0.9:1", start: 9, offsets: []int64{10}, lcd: 10},
{seq: "0,0.2,0.5,0.6,0.7,0.8,0.9,1", seg: "0:0.2", start: 1, offsets: []int64{4, 6}, lcd: 10},
{seq: "0,0.2,0.5,0.6,0.7,0.8,0.9,1", seg: "0.6:0.7", start: 3, offsets: []int64{10}, lcd: 10},
// not full sequences
{seq: "0,0.2,0.5", seg: "0:0.2", start: 3, offsets: []int64{6, 4}, lcd: 10},
{seq: "0,0.2,0.5", seg: "0.2:0.5", start: 1, offsets: []int64{4, 2, 4}, lcd: 10},
{seq: "0,2/5,4/5", seg: "0:2/5", start: 0, offsets: []int64{3, 2}, lcd: 5},
{seq: "0,2/5,4/5", seg: "2/5:4/5", start: 1, offsets: []int64{3, 2}, lcd: 5},
// no sequence
{seg: "0:0.2", start: 1, offsets: []int64{5}, lcd: 5},
{seg: "0:1/5", start: 1, offsets: []int64{5}, lcd: 5},
{seg: "0:2/10", start: 1, offsets: []int64{5}, lcd: 5},
{seg: "0:0.4", start: 1, offsets: []int64{2, 3}, lcd: 5},
{seg: "0:2/5", start: 1, offsets: []int64{2, 3}, lcd: 5},
{seg: "2/5:4/5", start: 1, offsets: []int64{3, 2}, lcd: 5},
{seg: "0:4/10", start: 1, offsets: []int64{2, 3}, lcd: 5},
{seg: "1/10:5/10", start: 1, offsets: []int64{2, 2, 4, 2}, lcd: 10},
}
for _, tc := range testCases {
tc := tc
t.Run(fmt.Sprintf("seq:%s;segment:%s", tc.seq, tc.seg), func(t *testing.T) {
ess, err := NewExecutionSegmentSequenceFromString(tc.seq)
require.NoError(t, err)
segment, err := NewExecutionSegmentFromString(tc.seg)
require.NoError(t, err)
et, err := NewExecutionTuple(segment, &ess)
require.NoError(t, err)
start, offsets, lcd := et.GetStripedOffsets()
assert.Equal(t, tc.start, start)
assert.Equal(t, tc.offsets, offsets)
assert.Equal(t, tc.lcd, lcd)
ess2, err := NewExecutionSegmentSequenceFromString(tc.seq)
require.NoError(t, err)
assert.Equal(t, ess.String(), ess2.String())
})
}
}
func TestSequenceLCD(t *testing.T) {
testCases := []struct {
seq string
lcd int64
}{
{seq: "0,0.3,0.5,0.6,0.7,0.8,0.9,1", lcd: 10},
{seq: "0,0.1,0.5,0.6,0.7,0.8,0.9,1", lcd: 10},
{seq: "0,0.2,0.5,0.6,0.7,0.8,0.9,1", lcd: 10},
{seq: "0,1/3,5/6", lcd: 6},
{seq: "0,1/3,4/7", lcd: 21},
}
for _, tc := range testCases {
tc := tc
t.Run(fmt.Sprintf("seq:%s", tc.seq), func(t *testing.T) {
ess, err := NewExecutionSegmentSequenceFromString(tc.seq)
require.NoError(t, err)
require.Equal(t, tc.lcd, ess.LCD())
})
}
}
func BenchmarkGetStripedOffsets(b *testing.B) {
lengths := [...]int64{10, 100}
const seed = 777
r := rand.New(rand.NewSource(seed))
for _, length := range lengths {
length := length
b.Run(fmt.Sprintf("length%d,seed%d", length, seed), func(b *testing.B) {
sequence := generateRandomSequence(b, length, 100, r)
b.ResetTimer()
for i := 0; i < b.N; i++ {
segment := sequence[int(r.Int63())%len(sequence)]
et, err := NewExecutionTuple(segment, &sequence)
require.NoError(b, err)
_, _, _ = et.GetStripedOffsets()
}
})
}
}
func BenchmarkGetStripedOffsetsEven(b *testing.B) {
lengths := [...]int64{10, 100, 1000}
generateSequence := func(n int64) ExecutionSegmentSequence {
var err error
ess := ExecutionSegmentSequence(make([]*ExecutionSegment, n))
numerators := make([]int64, n)
var denominator int64
for i := int64(0); i < n; i++ {
numerators[i] = 1 // nice and simple :)
denominator += numerators[i]
}
ess[0], err = NewExecutionSegment(big.NewRat(0, 1), big.NewRat(numerators[0], denominator))
require.NoError(b, err)
for i := int64(1); i < n; i++ {
ess[i], err = NewExecutionSegment(ess[i-1].to, new(big.Rat).Add(big.NewRat(numerators[i], denominator), ess[i-1].to))
require.NoError(b, err, "%d", i)
}
return ess
}
for _, length := range lengths {
length := length
b.Run(fmt.Sprintf("length%d", length), func(b *testing.B) {
sequence := generateSequence(length)
b.ResetTimer()
for i := 0; i < b.N; i++ {
segment := sequence[111233%len(sequence)]
et, err := NewExecutionTuple(segment, &sequence)
require.NoError(b, err)
_, _, _ = et.GetStripedOffsets()
}
})
}
}
func TestGetNewExecutionTupleBesedOnValue(t *testing.T) {
t.Parallel()
testCases := []struct {
seq string
seg string
value int64
expected string
}{
// full sequences
{seq: "0,1/3,2/3,1", seg: "0:1/3", value: 20, expected: "0,7/20,7/10,1"},
}
for _, tc := range testCases {
tc := tc
t.Run(fmt.Sprintf("seq:%s;segment:%s", tc.seq, tc.seg), func(t *testing.T) {
ess, err := NewExecutionSegmentSequenceFromString(tc.seq)
require.NoError(t, err)
segment, err := NewExecutionSegmentFromString(tc.seg)
require.NoError(t, err)
et, err := NewExecutionTuple(segment, &ess)
require.NoError(t, err)
newET, err := et.GetNewExecutionTupleFromValue(tc.value)
require.NoError(t, err)
require.Equal(t, tc.expected, newET.Sequence.String())
})
}
}
func mustNewExecutionSegment(str string) *ExecutionSegment {
res, err := NewExecutionSegmentFromString(str)
if err != nil {
panic(err)
}
return res
}
func mustNewExecutionSegmentSequence(str string) *ExecutionSegmentSequence {
res, err := NewExecutionSegmentSequenceFromString(str)
if err != nil {
panic(err)
}
return &res
}
func TestNewExecutionTuple(t *testing.T) {
testCases := []struct {
seg *ExecutionSegment
seq *ExecutionSegmentSequence
scaleTests map[int64]int64
newScaleTests map[int64]map[int64]int64 // this is for after calling GetNewExecutionSegmentSequenceFromValue
}{
{
// both segment and sequence are nil
scaleTests: map[int64]int64{
50: 50,
1: 1,
0: 0,
},
newScaleTests: map[int64]map[int64]int64{
50: {50: 50, 1: 1, 0: 0},
1: {50: 50, 1: 1, 0: 0},
0: nil,
},
},
{
seg: mustNewExecutionSegment("0:1"),
// nil sequence
scaleTests: map[int64]int64{
50: 50,
1: 1,
0: 0,
},
newScaleTests: map[int64]map[int64]int64{
50: {50: 50, 1: 1, 0: 0},
1: {50: 50, 1: 1, 0: 0},
0: nil,
},
},
{
seg: mustNewExecutionSegment("0:1"),
seq: mustNewExecutionSegmentSequence("0,1"),
scaleTests: map[int64]int64{
50: 50,
1: 1,
0: 0,
},
newScaleTests: map[int64]map[int64]int64{
50: {50: 50, 1: 1, 0: 0},
1: {50: 50, 1: 1, 0: 0},
0: nil,
},
},
{
seg: mustNewExecutionSegment("0:1"),
seq: mustNewExecutionSegmentSequence(""),
scaleTests: map[int64]int64{
50: 50,
1: 1,
0: 0,
},
newScaleTests: map[int64]map[int64]int64{
50: {50: 50, 1: 1, 0: 0},
1: {50: 50, 1: 1, 0: 0},
0: nil,
},
},
{
seg: mustNewExecutionSegment("0:1/3"),
seq: mustNewExecutionSegmentSequence("0,1/3,2/3,1"),
scaleTests: map[int64]int64{
50: 17,
3: 1,
2: 1,
1: 1,
0: 0,
},
newScaleTests: map[int64]map[int64]int64{
50: {50: 17, 1: 1, 0: 0},
20: {50: 18, 1: 1, 0: 0},
3: {50: 17, 1: 1, 0: 0},
2: {50: 25, 1: 1, 0: 0},
1: {50: 50, 1: 1, 0: 0},
0: nil,
},
},
{
seg: mustNewExecutionSegment("1/3:2/3"),
seq: mustNewExecutionSegmentSequence("0,1/3,2/3,1"),
scaleTests: map[int64]int64{
50: 17,
3: 1,
2: 1,
1: 0,
0: 0,
},
newScaleTests: map[int64]map[int64]int64{
50: {50: 17, 1: 0, 0: 0},
20: {50: 17, 1: 0, 0: 0},
3: {50: 17, 1: 0, 0: 0},
2: {50: 25, 1: 0, 0: 0},
1: nil,
0: nil,
},
},
{
seg: mustNewExecutionSegment("2/3:1"),
seq: mustNewExecutionSegmentSequence("0,1/3,2/3,1"),
scaleTests: map[int64]int64{
50: 16,
3: 1,
2: 0,
1: 0,
0: 0,
},
newScaleTests: map[int64]map[int64]int64{
50: {50: 16, 1: 0, 0: 0},
20: {50: 15, 1: 0, 0: 0},
3: {50: 16, 1: 0, 0: 0},
2: nil,
1: nil,
0: nil,
},
},
}
for _, testCase := range testCases {
testCase := testCase
t.Run(fmt.Sprintf("seg:'%s',seq:'%s'", testCase.seg, testCase.seq), func(t *testing.T) {
et, err := NewExecutionTuple(testCase.seg, testCase.seq)
require.NoError(t, err)
for scaleValue, result := range testCase.scaleTests {
require.Equal(t, result, et.ScaleInt64(scaleValue), "%d->%d", scaleValue, result)
}
for value, newResult := range testCase.newScaleTests {
newET, err := et.GetNewExecutionTupleFromValue(value)
if newResult == nil {
require.Error(t, err)
continue
}
require.NoError(t, err)
for scaleValue, result := range newResult {
require.Equal(t, result, newET.ScaleInt64(scaleValue),
"GetNewExecutionTupleFromValue(%d)%d->%d", value, scaleValue, result)
}
}
})
}
}
func BenchmarkExecutionSegmentScale(b *testing.B) {
testCases := []struct {
seq string
seg string
}{
{},
{seg: "0:1"},
{seq: "0,0.3,0.5,0.6,0.7,0.8,0.9,1", seg: "0:0.3"},
{seq: "0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1", seg: "0:0.1"},
{seg: "2/5:4/5"},
{seg: "2235/5213:4/5"}, // just wanted it to be ugly ;D
}
for _, tc := range testCases {
tc := tc
b.Run(fmt.Sprintf("seq:%s;segment:%s", tc.seq, tc.seg), func(b *testing.B) {
ess, err := NewExecutionSegmentSequenceFromString(tc.seq)
require.NoError(b, err)
segment, err := NewExecutionSegmentFromString(tc.seg)
require.NoError(b, err)
if tc.seg == "" {
segment = nil // specifically for the optimization
}
et, err := NewExecutionTuple(segment, &ess)
require.NoError(b, err)
for _, value := range []int64{5, 5523, 5000000, 67280421310721} {
value := value
b.Run(fmt.Sprintf("segment.Scale(%d)", value), func(b *testing.B) {
for i := 0; i < b.N; i++ {
segment.Scale(value)
}
})
b.Run(fmt.Sprintf("et.Scale(%d)", value), func(b *testing.B) {
for i := 0; i < b.N; i++ {
et, err = NewExecutionTuple(segment, &ess)
require.NoError(b, err)
et.ScaleInt64(value)
}
})
et.ScaleInt64(1) // precache
b.Run(fmt.Sprintf("et.Scale(%d) prefilled", value), func(b *testing.B) {
for i := 0; i < b.N; i++ {
et.ScaleInt64(value)
}
})
}
})
}
}
// TODO: test with randomized things
func TestSegmentedIndex(t *testing.T) {
t.Parallel()
// TODO ... more structure ?
t.Run("full", func(t *testing.T) {
t.Parallel()
s := SegmentedIndex{start: 0, lcd: 1, offsets: []int64{1}}
s.Next()
assert.EqualValues(t, 1, s.unscaled)
assert.EqualValues(t, 1, s.scaled)
s.Prev()
assert.EqualValues(t, 0, s.unscaled)
assert.EqualValues(t, 0, s.scaled)
s.Next()
assert.EqualValues(t, 1, s.unscaled)
assert.EqualValues(t, 1, s.scaled)
s.Next()
assert.EqualValues(t, 2, s.unscaled)
assert.EqualValues(t, 2, s.scaled)
s.Next()
assert.EqualValues(t, 3, s.unscaled)
assert.EqualValues(t, 3, s.scaled)
s.Prev()
assert.EqualValues(t, 2, s.unscaled)
assert.EqualValues(t, 2, s.scaled)
s.Prev()
assert.EqualValues(t, 1, s.unscaled)
assert.EqualValues(t, 1, s.scaled)
s.Next()
assert.EqualValues(t, 2, s.unscaled)
assert.EqualValues(t, 2, s.scaled)
})
t.Run("half", func(t *testing.T) {
t.Parallel()
s := SegmentedIndex{start: 0, lcd: 2, offsets: []int64{2}}
s.Next()
assert.EqualValues(t, 1, s.unscaled)
assert.EqualValues(t, 1, s.scaled)
s.Prev()
assert.EqualValues(t, 0, s.unscaled)
assert.EqualValues(t, 0, s.scaled)
s.Next()
assert.EqualValues(t, 1, s.unscaled)
assert.EqualValues(t, 1, s.scaled)
s.Next()
assert.EqualValues(t, 3, s.unscaled)
assert.EqualValues(t, 2, s.scaled)
s.Next()
assert.EqualValues(t, 5, s.unscaled)
assert.EqualValues(t, 3, s.scaled)
s.Prev()
assert.EqualValues(t, 3, s.unscaled)
assert.EqualValues(t, 2, s.scaled)
s.Prev()
assert.EqualValues(t, 1, s.unscaled)
assert.EqualValues(t, 1, s.scaled)
s.Prev()