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Diffstat (limited to 'pkg/segment/test/segment_test.go')
-rw-r--r--pkg/segment/test/segment_test.go564
1 files changed, 0 insertions, 564 deletions
diff --git a/pkg/segment/test/segment_test.go b/pkg/segment/test/segment_test.go
deleted file mode 100644
index f19a005f3..000000000
--- a/pkg/segment/test/segment_test.go
+++ /dev/null
@@ -1,564 +0,0 @@
-// Copyright 2018 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package segment
-
-import (
- "fmt"
- "math/rand"
- "testing"
-)
-
-const (
- // testSize is the baseline number of elements inserted into sets under
- // test, and is chosen to be large enough to ensure interesting amounts of
- // tree rebalancing.
- //
- // Note that because checkSet is called between each insertion/removal in
- // some tests that use it, tests may be quadratic in testSize.
- testSize = 8000
-
- // valueOffset is the difference between the value and start of test
- // segments.
- valueOffset = 100000
-)
-
-func shuffle(xs []int) {
- for i := range xs {
- j := rand.Intn(i + 1)
- xs[i], xs[j] = xs[j], xs[i]
- }
-}
-
-func randPermutation(size int) []int {
- p := make([]int, size)
- for i := range p {
- p[i] = i
- }
- shuffle(p)
- return p
-}
-
-// checkSet returns an error if s is incorrectly sorted, does not contain
-// exactly expectedSegments segments, or contains a segment for which val !=
-// key + valueOffset.
-func checkSet(s *Set, expectedSegments int) error {
- havePrev := false
- prev := 0
- nrSegments := 0
- for seg := s.FirstSegment(); seg.Ok(); seg = seg.NextSegment() {
- next := seg.Start()
- if havePrev && prev >= next {
- return fmt.Errorf("incorrect order: key %d (segment %d) >= key %d (segment %d)", prev, nrSegments-1, next, nrSegments)
- }
- if got, want := seg.Value(), seg.Start()+valueOffset; got != want {
- return fmt.Errorf("segment %d has key %d, value %d (expected %d)", nrSegments, seg.Start, got, want)
- }
- prev = next
- havePrev = true
- nrSegments++
- }
- if nrSegments != expectedSegments {
- return fmt.Errorf("incorrect number of segments: got %d, wanted %d", nrSegments, expectedSegments)
- }
- return nil
-}
-
-// countSegmentsIn returns the number of segments in s.
-func countSegmentsIn(s *Set) int {
- var count int
- for seg := s.FirstSegment(); seg.Ok(); seg = seg.NextSegment() {
- count++
- }
- return count
-}
-
-func TestAddRandom(t *testing.T) {
- var s Set
- order := randPermutation(testSize)
- var nrInsertions int
- for i, j := range order {
- if !s.AddWithoutMerging(Range{j, j + 1}, j+valueOffset) {
- t.Errorf("Iteration %d: failed to insert segment with key %d", i, j)
- break
- }
- nrInsertions++
- if err := checkSet(&s, nrInsertions); err != nil {
- t.Errorf("Iteration %d: %v", i, err)
- break
- }
- }
- if got, want := countSegmentsIn(&s), nrInsertions; got != want {
- t.Errorf("Wrong final number of segments: got %d, wanted %d", got, want)
- }
- if t.Failed() {
- t.Logf("Insertion order: %v", order[:nrInsertions])
- t.Logf("Set contents:\n%v", &s)
- }
-}
-
-func TestRemoveRandom(t *testing.T) {
- var s Set
- for i := 0; i < testSize; i++ {
- if !s.AddWithoutMerging(Range{i, i + 1}, i+valueOffset) {
- t.Fatalf("Failed to insert segment %d", i)
- }
- }
- order := randPermutation(testSize)
- var nrRemovals int
- for i, j := range order {
- seg := s.FindSegment(j)
- if !seg.Ok() {
- t.Errorf("Iteration %d: failed to find segment with key %d", i, j)
- break
- }
- s.Remove(seg)
- nrRemovals++
- if err := checkSet(&s, testSize-nrRemovals); err != nil {
- t.Errorf("Iteration %d: %v", i, err)
- break
- }
- }
- if got, want := countSegmentsIn(&s), testSize-nrRemovals; got != want {
- t.Errorf("Wrong final number of segments: got %d, wanted %d", got, want)
- }
- if t.Failed() {
- t.Logf("Removal order: %v", order[:nrRemovals])
- t.Logf("Set contents:\n%v", &s)
- t.FailNow()
- }
-}
-
-func TestAddSequentialAdjacent(t *testing.T) {
- var s Set
- var nrInsertions int
- for i := 0; i < testSize; i++ {
- if !s.AddWithoutMerging(Range{i, i + 1}, i+valueOffset) {
- t.Fatalf("Failed to insert segment %d", i)
- }
- nrInsertions++
- if err := checkSet(&s, nrInsertions); err != nil {
- t.Errorf("Iteration %d: %v", i, err)
- break
- }
- }
- if got, want := countSegmentsIn(&s), nrInsertions; got != want {
- t.Errorf("Wrong final number of segments: got %d, wanted %d", got, want)
- }
- if t.Failed() {
- t.Logf("Set contents:\n%v", &s)
- }
-
- first := s.FirstSegment()
- gotSeg, gotGap := first.PrevNonEmpty()
- if wantGap := s.FirstGap(); gotSeg.Ok() || gotGap != wantGap {
- t.Errorf("FirstSegment().PrevNonEmpty(): got (%v, %v), wanted (<terminal iterator>, %v)", gotSeg, gotGap, wantGap)
- }
- gotSeg, gotGap = first.NextNonEmpty()
- if wantSeg := first.NextSegment(); gotSeg != wantSeg || gotGap.Ok() {
- t.Errorf("FirstSegment().NextNonEmpty(): got (%v, %v), wanted (%v, <terminal iterator>)", gotSeg, gotGap, wantSeg)
- }
-
- last := s.LastSegment()
- gotSeg, gotGap = last.PrevNonEmpty()
- if wantSeg := last.PrevSegment(); gotSeg != wantSeg || gotGap.Ok() {
- t.Errorf("LastSegment().PrevNonEmpty(): got (%v, %v), wanted (%v, <terminal iterator>)", gotSeg, gotGap, wantSeg)
- }
- gotSeg, gotGap = last.NextNonEmpty()
- if wantGap := s.LastGap(); gotSeg.Ok() || gotGap != wantGap {
- t.Errorf("LastSegment().NextNonEmpty(): got (%v, %v), wanted (<terminal iterator>, %v)", gotSeg, gotGap, wantGap)
- }
-
- for seg := first.NextSegment(); seg != last; seg = seg.NextSegment() {
- gotSeg, gotGap = seg.PrevNonEmpty()
- if wantSeg := seg.PrevSegment(); gotSeg != wantSeg || gotGap.Ok() {
- t.Errorf("%v.PrevNonEmpty(): got (%v, %v), wanted (%v, <terminal iterator>)", seg, gotSeg, gotGap, wantSeg)
- }
- gotSeg, gotGap = seg.NextNonEmpty()
- if wantSeg := seg.NextSegment(); gotSeg != wantSeg || gotGap.Ok() {
- t.Errorf("%v.NextNonEmpty(): got (%v, %v), wanted (%v, <terminal iterator>)", seg, gotSeg, gotGap, wantSeg)
- }
- }
-}
-
-func TestAddSequentialNonAdjacent(t *testing.T) {
- var s Set
- var nrInsertions int
- for i := 0; i < testSize; i++ {
- // The range here differs from TestAddSequentialAdjacent so that
- // consecutive segments are not adjacent.
- if !s.AddWithoutMerging(Range{2 * i, 2*i + 1}, 2*i+valueOffset) {
- t.Fatalf("Failed to insert segment %d", i)
- }
- nrInsertions++
- if err := checkSet(&s, nrInsertions); err != nil {
- t.Errorf("Iteration %d: %v", i, err)
- break
- }
- }
- if got, want := countSegmentsIn(&s), nrInsertions; got != want {
- t.Errorf("Wrong final number of segments: got %d, wanted %d", got, want)
- }
- if t.Failed() {
- t.Logf("Set contents:\n%v", &s)
- }
-
- for seg := s.FirstSegment(); seg.Ok(); seg = seg.NextSegment() {
- gotSeg, gotGap := seg.PrevNonEmpty()
- if wantGap := seg.PrevGap(); gotSeg.Ok() || gotGap != wantGap {
- t.Errorf("%v.PrevNonEmpty(): got (%v, %v), wanted (<terminal iterator>, %v)", seg, gotSeg, gotGap, wantGap)
- }
- gotSeg, gotGap = seg.NextNonEmpty()
- if wantGap := seg.NextGap(); gotSeg.Ok() || gotGap != wantGap {
- t.Errorf("%v.NextNonEmpty(): got (%v, %v), wanted (<terminal iterator>, %v)", seg, gotSeg, gotGap, wantGap)
- }
- }
-}
-
-func TestMergeSplit(t *testing.T) {
- tests := []struct {
- name string
- initial []Range
- split bool
- splitAddr int
- final []Range
- }{
- {
- name: "Add merges after existing segment",
- initial: []Range{{1000, 1100}, {1100, 1200}},
- final: []Range{{1000, 1200}},
- },
- {
- name: "Add merges before existing segment",
- initial: []Range{{1100, 1200}, {1000, 1100}},
- final: []Range{{1000, 1200}},
- },
- {
- name: "Add merges between existing segments",
- initial: []Range{{1000, 1100}, {1200, 1300}, {1100, 1200}},
- final: []Range{{1000, 1300}},
- },
- {
- name: "SplitAt does nothing at a free address",
- initial: []Range{{100, 200}},
- split: true,
- splitAddr: 300,
- final: []Range{{100, 200}},
- },
- {
- name: "SplitAt does nothing at the beginning of a segment",
- initial: []Range{{100, 200}},
- split: true,
- splitAddr: 100,
- final: []Range{{100, 200}},
- },
- {
- name: "SplitAt does nothing at the end of a segment",
- initial: []Range{{100, 200}},
- split: true,
- splitAddr: 200,
- final: []Range{{100, 200}},
- },
- {
- name: "SplitAt splits in the middle of a segment",
- initial: []Range{{100, 200}},
- split: true,
- splitAddr: 150,
- final: []Range{{100, 150}, {150, 200}},
- },
- }
-Tests:
- for _, test := range tests {
- var s Set
- for _, r := range test.initial {
- if !s.Add(r, 0) {
- t.Errorf("%s: Add(%v) failed; set contents:\n%v", test.name, r, &s)
- continue Tests
- }
- }
- if test.split {
- s.SplitAt(test.splitAddr)
- }
- var i int
- for seg := s.FirstSegment(); seg.Ok(); seg = seg.NextSegment() {
- if i > len(test.final) {
- t.Errorf("%s: Incorrect number of segments: got %d, wanted %d; set contents:\n%v", test.name, countSegmentsIn(&s), len(test.final), &s)
- continue Tests
- }
- if got, want := seg.Range(), test.final[i]; got != want {
- t.Errorf("%s: Segment %d mismatch: got %v, wanted %v; set contents:\n%v", test.name, i, got, want, &s)
- continue Tests
- }
- i++
- }
- if i < len(test.final) {
- t.Errorf("%s: Incorrect number of segments: got %d, wanted %d; set contents:\n%v", test.name, i, len(test.final), &s)
- }
- }
-}
-
-func TestIsolate(t *testing.T) {
- tests := []struct {
- name string
- initial Range
- bounds Range
- final []Range
- }{
- {
- name: "Isolate does not split a segment that falls inside bounds",
- initial: Range{100, 200},
- bounds: Range{100, 200},
- final: []Range{{100, 200}},
- },
- {
- name: "Isolate splits at beginning of segment",
- initial: Range{50, 200},
- bounds: Range{100, 200},
- final: []Range{{50, 100}, {100, 200}},
- },
- {
- name: "Isolate splits at end of segment",
- initial: Range{100, 250},
- bounds: Range{100, 200},
- final: []Range{{100, 200}, {200, 250}},
- },
- {
- name: "Isolate splits at beginning and end of segment",
- initial: Range{50, 250},
- bounds: Range{100, 200},
- final: []Range{{50, 100}, {100, 200}, {200, 250}},
- },
- }
-Tests:
- for _, test := range tests {
- var s Set
- seg := s.Insert(s.FirstGap(), test.initial, 0)
- seg = s.Isolate(seg, test.bounds)
- if !test.bounds.IsSupersetOf(seg.Range()) {
- t.Errorf("%s: Isolated segment %v lies outside bounds %v; set contents:\n%v", test.name, seg.Range(), test.bounds, &s)
- }
- var i int
- for seg := s.FirstSegment(); seg.Ok(); seg = seg.NextSegment() {
- if i > len(test.final) {
- t.Errorf("%s: Incorrect number of segments: got %d, wanted %d; set contents:\n%v", test.name, countSegmentsIn(&s), len(test.final), &s)
- continue Tests
- }
- if got, want := seg.Range(), test.final[i]; got != want {
- t.Errorf("%s: Segment %d mismatch: got %v, wanted %v; set contents:\n%v", test.name, i, got, want, &s)
- continue Tests
- }
- i++
- }
- if i < len(test.final) {
- t.Errorf("%s: Incorrect number of segments: got %d, wanted %d; set contents:\n%v", test.name, i, len(test.final), &s)
- }
- }
-}
-
-func benchmarkAddSequential(b *testing.B, size int) {
- for n := 0; n < b.N; n++ {
- var s Set
- for i := 0; i < size; i++ {
- if !s.AddWithoutMerging(Range{i, i + 1}, i) {
- b.Fatalf("Failed to insert segment %d", i)
- }
- }
- }
-}
-
-func benchmarkAddRandom(b *testing.B, size int) {
- order := randPermutation(size)
-
- b.ResetTimer()
- for n := 0; n < b.N; n++ {
- var s Set
- for _, i := range order {
- if !s.AddWithoutMerging(Range{i, i + 1}, i) {
- b.Fatalf("Failed to insert segment %d", i)
- }
- }
- }
-}
-
-func benchmarkFindSequential(b *testing.B, size int) {
- var s Set
- for i := 0; i < size; i++ {
- if !s.AddWithoutMerging(Range{i, i + 1}, i) {
- b.Fatalf("Failed to insert segment %d", i)
- }
- }
-
- b.ResetTimer()
- for n := 0; n < b.N; n++ {
- for i := 0; i < size; i++ {
- if seg := s.FindSegment(i); !seg.Ok() {
- b.Fatalf("Failed to find segment %d", i)
- }
- }
- }
-}
-
-func benchmarkFindRandom(b *testing.B, size int) {
- var s Set
- for i := 0; i < size; i++ {
- if !s.AddWithoutMerging(Range{i, i + 1}, i) {
- b.Fatalf("Failed to insert segment %d", i)
- }
- }
- order := randPermutation(size)
-
- b.ResetTimer()
- for n := 0; n < b.N; n++ {
- for _, i := range order {
- if si := s.FindSegment(i); !si.Ok() {
- b.Fatalf("Failed to find segment %d", i)
- }
- }
- }
-}
-
-func benchmarkIteration(b *testing.B, size int) {
- var s Set
- for i := 0; i < size; i++ {
- if !s.AddWithoutMerging(Range{i, i + 1}, i) {
- b.Fatalf("Failed to insert segment %d", i)
- }
- }
-
- b.ResetTimer()
- var count uint64
- for n := 0; n < b.N; n++ {
- for seg := s.FirstSegment(); seg.Ok(); seg = seg.NextSegment() {
- count++
- }
- }
- if got, want := count, uint64(size)*uint64(b.N); got != want {
- b.Fatalf("Iterated wrong number of segments: got %d, wanted %d", got, want)
- }
-}
-
-func benchmarkAddFindRemoveSequential(b *testing.B, size int) {
- for n := 0; n < b.N; n++ {
- var s Set
- for i := 0; i < size; i++ {
- if !s.AddWithoutMerging(Range{i, i + 1}, i) {
- b.Fatalf("Failed to insert segment %d", i)
- }
- }
- for i := 0; i < size; i++ {
- seg := s.FindSegment(i)
- if !seg.Ok() {
- b.Fatalf("Failed to find segment %d", i)
- }
- s.Remove(seg)
- }
- if !s.IsEmpty() {
- b.Fatalf("Set not empty after all removals:\n%v", &s)
- }
- }
-}
-
-func benchmarkAddFindRemoveRandom(b *testing.B, size int) {
- order := randPermutation(size)
-
- b.ResetTimer()
- for n := 0; n < b.N; n++ {
- var s Set
- for _, i := range order {
- if !s.AddWithoutMerging(Range{i, i + 1}, i) {
- b.Fatalf("Failed to insert segment %d", i)
- }
- }
- for _, i := range order {
- seg := s.FindSegment(i)
- if !seg.Ok() {
- b.Fatalf("Failed to find segment %d", i)
- }
- s.Remove(seg)
- }
- if !s.IsEmpty() {
- b.Fatalf("Set not empty after all removals:\n%v", &s)
- }
- }
-}
-
-// Although we don't generally expect our segment sets to get this big, they're
-// useful for emulating the effect of cache pressure.
-var testSizes = []struct {
- desc string
- size int
-}{
- {"64", 1 << 6},
- {"256", 1 << 8},
- {"1K", 1 << 10},
- {"4K", 1 << 12},
- {"16K", 1 << 14},
- {"64K", 1 << 16},
-}
-
-func BenchmarkAddSequential(b *testing.B) {
- for _, test := range testSizes {
- b.Run(test.desc, func(b *testing.B) {
- benchmarkAddSequential(b, test.size)
- })
- }
-}
-
-func BenchmarkAddRandom(b *testing.B) {
- for _, test := range testSizes {
- b.Run(test.desc, func(b *testing.B) {
- benchmarkAddRandom(b, test.size)
- })
- }
-}
-
-func BenchmarkFindSequential(b *testing.B) {
- for _, test := range testSizes {
- b.Run(test.desc, func(b *testing.B) {
- benchmarkFindSequential(b, test.size)
- })
- }
-}
-
-func BenchmarkFindRandom(b *testing.B) {
- for _, test := range testSizes {
- b.Run(test.desc, func(b *testing.B) {
- benchmarkFindRandom(b, test.size)
- })
- }
-}
-
-func BenchmarkIteration(b *testing.B) {
- for _, test := range testSizes {
- b.Run(test.desc, func(b *testing.B) {
- benchmarkIteration(b, test.size)
- })
- }
-}
-
-func BenchmarkAddFindRemoveSequential(b *testing.B) {
- for _, test := range testSizes {
- b.Run(test.desc, func(b *testing.B) {
- benchmarkAddFindRemoveSequential(b, test.size)
- })
- }
-}
-
-func BenchmarkAddFindRemoveRandom(b *testing.B) {
- for _, test := range testSizes {
- b.Run(test.desc, func(b *testing.B) {
- benchmarkAddFindRemoveRandom(b, test.size)
- })
- }
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 14:44:24 +0000