565 lines
15 KiB
Go
565 lines
15 KiB
Go
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// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package segment
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import (
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"fmt"
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"math/rand"
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"testing"
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)
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const (
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// testSize is the baseline number of elements inserted into sets under
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// test, and is chosen to be large enough to ensure interesting amounts of
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// tree rebalancing.
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//
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// Note that because checkSet is called between each insertion/removal in
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// some tests that use it, tests may be quadratic in testSize.
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testSize = 8000
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// valueOffset is the difference between the value and start of test
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// segments.
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valueOffset = 100000
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)
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func shuffle(xs []int) {
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for i := range xs {
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j := rand.Intn(i + 1)
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xs[i], xs[j] = xs[j], xs[i]
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}
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}
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func randPermutation(size int) []int {
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p := make([]int, size)
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for i := range p {
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p[i] = i
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}
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shuffle(p)
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return p
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}
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// checkSet returns an error if s is incorrectly sorted, does not contain
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// exactly expectedSegments segments, or contains a segment for which val !=
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// key + valueOffset.
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func checkSet(s *Set, expectedSegments int) error {
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havePrev := false
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prev := 0
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nrSegments := 0
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for seg := s.FirstSegment(); seg.Ok(); seg = seg.NextSegment() {
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next := seg.Start()
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if havePrev && prev >= next {
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return fmt.Errorf("incorrect order: key %d (segment %d) >= key %d (segment %d)", prev, nrSegments-1, next, nrSegments)
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}
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if got, want := seg.Value(), seg.Start()+valueOffset; got != want {
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return fmt.Errorf("segment %d has key %d, value %d (expected %d)", nrSegments, seg.Start, got, want)
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}
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prev = next
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havePrev = true
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nrSegments++
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}
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if nrSegments != expectedSegments {
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return fmt.Errorf("incorrect number of segments: got %d, wanted %d", nrSegments, expectedSegments)
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}
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return nil
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}
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// countSegmentsIn returns the number of segments in s.
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func countSegmentsIn(s *Set) int {
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var count int
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for seg := s.FirstSegment(); seg.Ok(); seg = seg.NextSegment() {
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count++
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}
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return count
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}
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func TestAddRandom(t *testing.T) {
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var s Set
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order := randPermutation(testSize)
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var nrInsertions int
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for i, j := range order {
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if !s.AddWithoutMerging(Range{j, j + 1}, j+valueOffset) {
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t.Errorf("Iteration %d: failed to insert segment with key %d", i, j)
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break
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}
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nrInsertions++
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if err := checkSet(&s, nrInsertions); err != nil {
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t.Errorf("Iteration %d: %v", i, err)
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break
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}
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}
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if got, want := countSegmentsIn(&s), nrInsertions; got != want {
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t.Errorf("Wrong final number of segments: got %d, wanted %d", got, want)
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}
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if t.Failed() {
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t.Logf("Insertion order: %v", order[:nrInsertions])
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t.Logf("Set contents:\n%v", &s)
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}
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}
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func TestRemoveRandom(t *testing.T) {
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var s Set
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for i := 0; i < testSize; i++ {
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if !s.AddWithoutMerging(Range{i, i + 1}, i+valueOffset) {
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t.Fatalf("Failed to insert segment %d", i)
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}
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}
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order := randPermutation(testSize)
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var nrRemovals int
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for i, j := range order {
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seg := s.FindSegment(j)
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if !seg.Ok() {
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t.Errorf("Iteration %d: failed to find segment with key %d", i, j)
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break
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}
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s.Remove(seg)
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nrRemovals++
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if err := checkSet(&s, testSize-nrRemovals); err != nil {
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t.Errorf("Iteration %d: %v", i, err)
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break
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}
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}
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if got, want := countSegmentsIn(&s), testSize-nrRemovals; got != want {
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t.Errorf("Wrong final number of segments: got %d, wanted %d", got, want)
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}
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if t.Failed() {
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t.Logf("Removal order: %v", order[:nrRemovals])
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t.Logf("Set contents:\n%v", &s)
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t.FailNow()
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}
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}
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func TestAddSequentialAdjacent(t *testing.T) {
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var s Set
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var nrInsertions int
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for i := 0; i < testSize; i++ {
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if !s.AddWithoutMerging(Range{i, i + 1}, i+valueOffset) {
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t.Fatalf("Failed to insert segment %d", i)
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}
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nrInsertions++
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if err := checkSet(&s, nrInsertions); err != nil {
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t.Errorf("Iteration %d: %v", i, err)
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break
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}
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}
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if got, want := countSegmentsIn(&s), nrInsertions; got != want {
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t.Errorf("Wrong final number of segments: got %d, wanted %d", got, want)
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}
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if t.Failed() {
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t.Logf("Set contents:\n%v", &s)
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}
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first := s.FirstSegment()
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gotSeg, gotGap := first.PrevNonEmpty()
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if wantGap := s.FirstGap(); gotSeg.Ok() || gotGap != wantGap {
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t.Errorf("FirstSegment().PrevNonEmpty(): got (%v, %v), wanted (<terminal iterator>, %v)", gotSeg, gotGap, wantGap)
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}
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gotSeg, gotGap = first.NextNonEmpty()
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if wantSeg := first.NextSegment(); gotSeg != wantSeg || gotGap.Ok() {
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t.Errorf("FirstSegment().NextNonEmpty(): got (%v, %v), wanted (%v, <terminal iterator>)", gotSeg, gotGap, wantSeg)
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}
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last := s.LastSegment()
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gotSeg, gotGap = last.PrevNonEmpty()
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if wantSeg := last.PrevSegment(); gotSeg != wantSeg || gotGap.Ok() {
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t.Errorf("LastSegment().PrevNonEmpty(): got (%v, %v), wanted (%v, <terminal iterator>)", gotSeg, gotGap, wantSeg)
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}
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gotSeg, gotGap = last.NextNonEmpty()
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if wantGap := s.LastGap(); gotSeg.Ok() || gotGap != wantGap {
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t.Errorf("LastSegment().NextNonEmpty(): got (%v, %v), wanted (<terminal iterator>, %v)", gotSeg, gotGap, wantGap)
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}
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for seg := first.NextSegment(); seg != last; seg = seg.NextSegment() {
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gotSeg, gotGap = seg.PrevNonEmpty()
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if wantSeg := seg.PrevSegment(); gotSeg != wantSeg || gotGap.Ok() {
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t.Errorf("%v.PrevNonEmpty(): got (%v, %v), wanted (%v, <terminal iterator>)", seg, gotSeg, gotGap, wantSeg)
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}
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gotSeg, gotGap = seg.NextNonEmpty()
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if wantSeg := seg.NextSegment(); gotSeg != wantSeg || gotGap.Ok() {
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t.Errorf("%v.NextNonEmpty(): got (%v, %v), wanted (%v, <terminal iterator>)", seg, gotSeg, gotGap, wantSeg)
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}
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}
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}
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func TestAddSequentialNonAdjacent(t *testing.T) {
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var s Set
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var nrInsertions int
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for i := 0; i < testSize; i++ {
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// The range here differs from TestAddSequentialAdjacent so that
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// consecutive segments are not adjacent.
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if !s.AddWithoutMerging(Range{2 * i, 2*i + 1}, 2*i+valueOffset) {
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t.Fatalf("Failed to insert segment %d", i)
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}
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nrInsertions++
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if err := checkSet(&s, nrInsertions); err != nil {
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t.Errorf("Iteration %d: %v", i, err)
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break
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}
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}
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if got, want := countSegmentsIn(&s), nrInsertions; got != want {
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t.Errorf("Wrong final number of segments: got %d, wanted %d", got, want)
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}
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if t.Failed() {
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t.Logf("Set contents:\n%v", &s)
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}
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for seg := s.FirstSegment(); seg.Ok(); seg = seg.NextSegment() {
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gotSeg, gotGap := seg.PrevNonEmpty()
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if wantGap := seg.PrevGap(); gotSeg.Ok() || gotGap != wantGap {
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t.Errorf("%v.PrevNonEmpty(): got (%v, %v), wanted (<terminal iterator>, %v)", seg, gotSeg, gotGap, wantGap)
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}
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gotSeg, gotGap = seg.NextNonEmpty()
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if wantGap := seg.NextGap(); gotSeg.Ok() || gotGap != wantGap {
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t.Errorf("%v.NextNonEmpty(): got (%v, %v), wanted (<terminal iterator>, %v)", seg, gotSeg, gotGap, wantGap)
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}
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}
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}
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func TestMergeSplit(t *testing.T) {
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tests := []struct {
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name string
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initial []Range
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split bool
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splitAddr int
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final []Range
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}{
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{
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name: "Add merges after existing segment",
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initial: []Range{{1000, 1100}, {1100, 1200}},
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final: []Range{{1000, 1200}},
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},
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{
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name: "Add merges before existing segment",
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initial: []Range{{1100, 1200}, {1000, 1100}},
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final: []Range{{1000, 1200}},
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},
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{
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name: "Add merges between existing segments",
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initial: []Range{{1000, 1100}, {1200, 1300}, {1100, 1200}},
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final: []Range{{1000, 1300}},
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},
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{
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name: "SplitAt does nothing at a free address",
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initial: []Range{{100, 200}},
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split: true,
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splitAddr: 300,
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final: []Range{{100, 200}},
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},
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{
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name: "SplitAt does nothing at the beginning of a segment",
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initial: []Range{{100, 200}},
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split: true,
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splitAddr: 100,
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final: []Range{{100, 200}},
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},
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{
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name: "SplitAt does nothing at the end of a segment",
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initial: []Range{{100, 200}},
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split: true,
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splitAddr: 200,
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final: []Range{{100, 200}},
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},
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{
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name: "SplitAt splits in the middle of a segment",
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initial: []Range{{100, 200}},
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split: true,
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splitAddr: 150,
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final: []Range{{100, 150}, {150, 200}},
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},
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}
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Tests:
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for _, test := range tests {
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var s Set
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for _, r := range test.initial {
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if !s.Add(r, 0) {
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t.Errorf("%s: Add(%v) failed; set contents:\n%v", test.name, r, &s)
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continue Tests
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}
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}
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if test.split {
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s.SplitAt(test.splitAddr)
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}
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var i int
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for seg := s.FirstSegment(); seg.Ok(); seg = seg.NextSegment() {
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if i > len(test.final) {
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t.Errorf("%s: Incorrect number of segments: got %d, wanted %d; set contents:\n%v", test.name, countSegmentsIn(&s), len(test.final), &s)
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continue Tests
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}
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if got, want := seg.Range(), test.final[i]; got != want {
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t.Errorf("%s: Segment %d mismatch: got %v, wanted %v; set contents:\n%v", test.name, i, got, want, &s)
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continue Tests
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}
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i++
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}
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if i < len(test.final) {
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t.Errorf("%s: Incorrect number of segments: got %d, wanted %d; set contents:\n%v", test.name, i, len(test.final), &s)
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}
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}
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}
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func TestIsolate(t *testing.T) {
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tests := []struct {
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name string
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initial Range
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bounds Range
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final []Range
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}{
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{
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name: "Isolate does not split a segment that falls inside bounds",
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initial: Range{100, 200},
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bounds: Range{100, 200},
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final: []Range{{100, 200}},
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},
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{
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name: "Isolate splits at beginning of segment",
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initial: Range{50, 200},
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bounds: Range{100, 200},
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final: []Range{{50, 100}, {100, 200}},
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},
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{
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name: "Isolate splits at end of segment",
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initial: Range{100, 250},
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bounds: Range{100, 200},
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final: []Range{{100, 200}, {200, 250}},
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},
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{
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name: "Isolate splits at beginning and end of segment",
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initial: Range{50, 250},
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bounds: Range{100, 200},
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final: []Range{{50, 100}, {100, 200}, {200, 250}},
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},
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}
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Tests:
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for _, test := range tests {
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var s Set
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seg := s.Insert(s.FirstGap(), test.initial, 0)
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seg = s.Isolate(seg, test.bounds)
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if !test.bounds.IsSupersetOf(seg.Range()) {
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t.Errorf("%s: Isolated segment %v lies outside bounds %v; set contents:\n%v", test.name, seg.Range(), test.bounds, &s)
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}
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var i int
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for seg := s.FirstSegment(); seg.Ok(); seg = seg.NextSegment() {
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if i > len(test.final) {
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t.Errorf("%s: Incorrect number of segments: got %d, wanted %d; set contents:\n%v", test.name, countSegmentsIn(&s), len(test.final), &s)
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continue Tests
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}
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if got, want := seg.Range(), test.final[i]; got != want {
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t.Errorf("%s: Segment %d mismatch: got %v, wanted %v; set contents:\n%v", test.name, i, got, want, &s)
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continue Tests
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}
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i++
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}
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if i < len(test.final) {
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t.Errorf("%s: Incorrect number of segments: got %d, wanted %d; set contents:\n%v", test.name, i, len(test.final), &s)
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}
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}
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}
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func benchmarkAddSequential(b *testing.B, size int) {
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for n := 0; n < b.N; n++ {
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var s Set
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for i := 0; i < size; i++ {
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if !s.AddWithoutMerging(Range{i, i + 1}, i) {
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b.Fatalf("Failed to insert segment %d", i)
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}
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}
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}
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}
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func benchmarkAddRandom(b *testing.B, size int) {
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order := randPermutation(size)
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b.ResetTimer()
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for n := 0; n < b.N; n++ {
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var s Set
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for _, i := range order {
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if !s.AddWithoutMerging(Range{i, i + 1}, i) {
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b.Fatalf("Failed to insert segment %d", i)
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}
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}
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}
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}
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func benchmarkFindSequential(b *testing.B, size int) {
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var s Set
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for i := 0; i < size; i++ {
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if !s.AddWithoutMerging(Range{i, i + 1}, i) {
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b.Fatalf("Failed to insert segment %d", i)
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}
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}
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b.ResetTimer()
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for n := 0; n < b.N; n++ {
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for i := 0; i < size; i++ {
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if seg := s.FindSegment(i); !seg.Ok() {
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b.Fatalf("Failed to find segment %d", i)
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}
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}
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}
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}
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func benchmarkFindRandom(b *testing.B, size int) {
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var s Set
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for i := 0; i < size; i++ {
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if !s.AddWithoutMerging(Range{i, i + 1}, i) {
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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)
|
||
|
})
|
||
|
}
|
||
|
}
|