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Merge pull request #11805 from bboreham/fix-benchmark-intersect 

tsdb/index: fix BenchmarkIntersect to do work on each loop
This commit is contained in:
Ganesh Vernekar 2023-01-04 18:19:14 +05:30 committed by GitHub
parent 84c6f0e584 3da2c99ffd
commit fa0f04bbc6
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 29 additions and 16 deletions
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41
tsdb/index/postings_test.go
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@ -280,6 +280,13 @@ func TestMultiIntersect(t *testing.T) {
}
}
func consumePostings(p Postings) error {
for p.Next() {
p.At()
}
return p.Err()
}
func BenchmarkIntersect(t *testing.B) {
t.Run("LongPostings1", func(bench *testing.B) {
var a, b, c, d []storage.SeriesRef
@ -300,15 +307,14 @@ func BenchmarkIntersect(t *testing.B) {
d = append(d, storage.SeriesRef(i))
}
bench.ResetTimer()
bench.ReportAllocs()
for i := 0; i < bench.N; i++ {
i1 := newListPostings(a...)
i2 := newListPostings(b...)
i3 := newListPostings(c...)
i4 := newListPostings(d...)
bench.ResetTimer()
bench.ReportAllocs()
for i := 0; i < bench.N; i++ {
if _, err := ExpandPostings(Intersect(i1, i2, i3, i4)); err != nil {
if err := consumePostings(Intersect(i1, i2, i3, i4)); err != nil {
bench.Fatal(err)
}
}
@ -330,15 +336,14 @@ func BenchmarkIntersect(t *testing.B) {
d = append(d, storage.SeriesRef(i))
}
bench.ResetTimer()
bench.ReportAllocs()
for i := 0; i < bench.N; i++ {
i1 := newListPostings(a...)
i2 := newListPostings(b...)
i3 := newListPostings(c...)
i4 := newListPostings(d...)
bench.ResetTimer()
bench.ReportAllocs()
for i := 0; i < bench.N; i++ {
if _, err := ExpandPostings(Intersect(i1, i2, i3, i4)); err != nil {
if err := consumePostings(Intersect(i1, i2, i3, i4)); err != nil {
bench.Fatal(err)
}
}
@ -346,21 +351,29 @@ func BenchmarkIntersect(t *testing.B) {
// Many matchers(k >> n).
t.Run("ManyPostings", func(bench *testing.B) {
var its []Postings
var lps []*ListPostings
var refs [][]storage.SeriesRef
// 100000 matchers(k=100000).
// Create 100000 matchers(k=100000), making sure all memory allocation is done before starting the loop.
for i := 0; i < 100000; i++ {
var temp []storage.SeriesRef
for j := storage.SeriesRef(1); j < 100; j++ {
temp = append(temp, j)
}
its = append(its, newListPostings(temp...))
lps = append(lps, newListPostings(temp...))
refs = append(refs, temp)
}
its := make([]Postings, len(refs))
bench.ResetTimer()
bench.ReportAllocs()
for i := 0; i < bench.N; i++ {
if _, err := ExpandPostings(Intersect(its...)); err != nil {
// Reset the ListPostings to their original values each time round the loop.
for j := range refs {
lps[j].list = refs[j]
its[j] = lps[j]
}
if err := consumePostings(Intersect(its...)); err != nil {
bench.Fatal(err)
}
}