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https://github.com/VictoriaMetrics/VictoriaMetrics.git
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fae589bb83
The change adds a fastpath for `equalValue` comparisons against `__name__` label by avoiding calls to `toCanonicalLabelName` func. This speedups matches by metric name like `'foo'`. See bench stats below: ``` benchcmp old.txt new.txt benchmark old ns/op new ns/op delta BenchmarkIfExpression/equal_label:_last-10 35.6 35.1 -1.18% BenchmarkIfExpression/equal_label:_middle-10 18.3 17.3 -5.41% BenchmarkIfExpression/equal_label:_first-10 1.20 1.24 +2.74% BenchmarkIfExpression/equal___name__:_last-10 10.1 4.96 -50.75% BenchmarkIfExpression/equal___name__:_middle-10 5.79 3.16 -45.41% BenchmarkIfExpression/equal___name__:_first-10 1.17 1.05 -9.76% ``` Signed-off-by: hagen1778 <roman@victoriametrics.com>
78 lines
1.8 KiB
Go
78 lines
1.8 KiB
Go
package promrelabel
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import (
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"fmt"
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"gopkg.in/yaml.v2"
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"testing"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
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)
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func BenchmarkIfExpression(b *testing.B) {
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const maxLabels = 100
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labels := make([]prompbmarshal.Label, maxLabels)
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for i := 0; i < maxLabels; i++ {
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label := prompbmarshal.Label{
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Name: fmt.Sprintf("foo%d", i),
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Value: fmt.Sprintf("bar%d", i),
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}
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labels[i] = label
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}
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b.Run("equal label: last", func(b *testing.B) {
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n := maxLabels - 1
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ifExpr := fmt.Sprintf(`'{foo%d="bar%d"}'`, n, n)
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benchIfExpr(b, ifExpr, labels)
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})
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b.Run("equal label: middle", func(b *testing.B) {
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n := maxLabels / 2
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ifExpr := fmt.Sprintf(`'{foo%d="bar%d"}'`, n, n)
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benchIfExpr(b, ifExpr, labels)
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})
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b.Run("equal label: first", func(b *testing.B) {
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ifExpr := fmt.Sprintf(`'{foo%d="bar%d"}'`, 0, 0)
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benchIfExpr(b, ifExpr, labels)
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})
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labels[maxLabels-1] = prompbmarshal.Label{
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Name: "__name__",
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Value: "foo",
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}
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b.Run("equal __name__: last", func(b *testing.B) {
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ifExpr := `foo`
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benchIfExpr(b, ifExpr, labels)
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})
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labels[maxLabels/2] = prompbmarshal.Label{
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Name: "__name__",
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Value: "foo",
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}
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b.Run("equal __name__: middle", func(b *testing.B) {
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ifExpr := `foo`
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benchIfExpr(b, ifExpr, labels)
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})
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labels[0] = prompbmarshal.Label{
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Name: "__name__",
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Value: "foo",
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}
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b.Run("equal __name__: first", func(b *testing.B) {
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ifExpr := `foo`
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benchIfExpr(b, ifExpr, labels)
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})
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}
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func benchIfExpr(b *testing.B, expr string, labels []prompbmarshal.Label) {
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b.Helper()
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var ie IfExpression
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if err := yaml.UnmarshalStrict([]byte(expr), &ie); err != nil {
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b.Fatalf("unexpected error during unmarshal: %s", err)
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}
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b.RunParallel(func(pb *testing.PB) {
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for pb.Next() {
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if !ie.Match(labels) {
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panic(fmt.Sprintf("expected to have a match for %q", expr))
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}
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}
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})
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}
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