prometheus/model/fingerprinting_test.go

105 lines
2.4 KiB
Go

// Copyright 2013 Prometheus Team
// 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 model
import (
"runtime"
"testing"
)
func TestFingerprintComparison(t *testing.T) {
fingerprints := []*Fingerprint{
{
hash: 0,
firstCharacterOfFirstLabelName: "b",
labelMatterLength: 1,
lastCharacterOfLastLabelValue: "b",
},
{
hash: 1,
firstCharacterOfFirstLabelName: "a",
labelMatterLength: 0,
lastCharacterOfLastLabelValue: "a",
},
{
hash: 1,
firstCharacterOfFirstLabelName: "a",
labelMatterLength: 1000,
lastCharacterOfLastLabelValue: "b",
},
{
hash: 1,
firstCharacterOfFirstLabelName: "b",
labelMatterLength: 0,
lastCharacterOfLastLabelValue: "a",
},
{
hash: 1,
firstCharacterOfFirstLabelName: "b",
labelMatterLength: 1,
lastCharacterOfLastLabelValue: "a",
},
{
hash: 1,
firstCharacterOfFirstLabelName: "b",
labelMatterLength: 1,
lastCharacterOfLastLabelValue: "b",
},
}
for i := range fingerprints {
if i == 0 {
continue
}
if !fingerprints[i-1].Less(fingerprints[i]) {
t.Errorf("%d expected %s < %s", i, fingerprints[i-1], fingerprints[i])
}
}
}
func BenchmarkFingerprinting(b *testing.B) {
b.StopTimer()
fps := []*Fingerprint{
{
hash: 0,
firstCharacterOfFirstLabelName: "a",
labelMatterLength: 2,
lastCharacterOfLastLabelValue: "z",
},
{
hash: 0,
firstCharacterOfFirstLabelName: "a",
labelMatterLength: 2,
lastCharacterOfLastLabelValue: "z",
},
}
for i := 0; i < 10; i++ {
fps[0].Less(fps[1])
}
b.Logf("N: %v", b.N)
b.StartTimer()
var pre runtime.MemStats
runtime.ReadMemStats(&pre)
for i := 0; i < b.N; i++ {
fps[0].Less(fps[1])
}
var post runtime.MemStats
runtime.ReadMemStats(&post)
b.Logf("allocs: %d items: ", post.TotalAlloc-pre.TotalAlloc)
}