mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-25 21:54:10 -08:00
280eaf33f0
* Use global string map for MatchType.String()
We were unnecessarily creating a new map for each call of String().
This is a 10x improvement in MatchType.String() performance in time,
from 53ns to 4ns on my i7 laptop, and I guess that this method is being
called quite often so why throw out the resources.
I was surprised that benchmark says that there are no allocations made
in the old version.
I also tries using `//go:generate stringer` and the result is even
better, at about 2.8ns, but having to keep the generated code updated
isn't worth the change (at least it's bigger than a small change I was
intended to do)
Benchmark comparison:
name \ time/op old global_map stringer
MatchType_String 53.6ns ± 1% 4.1ns ± 1% 2.8ns ± 1%
name \ alloc/op old global_map stringer
MatchType_String 0.00B 0.00B 0.00B
name \ allocs/op old global_map stringer
MatchType_String 0.00 0.00 0.00
Old benchmark:
goos: darwin
goarch: amd64
pkg: github.com/prometheus/prometheus/pkg/labels
cpu: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
BenchmarkMatchType_String 21766578 54.36 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 21742339 53.28 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 21985470 53.37 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 21676282 53.50 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 22075573 53.33 ns/op 0 B/op 0 allocs/op
PASS
ok github.com/prometheus/prometheus/pkg/labels 6.252s
New with global map:
goos: darwin
goarch: amd64
pkg: github.com/prometheus/prometheus/pkg/labels
cpu: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
BenchmarkMatchType_String 283412692 4.129 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 294859941 4.091 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 295750158 4.113 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 282827982 4.072 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 292942393 4.047 ns/op 0 B/op 0 allocs/op
PASS
ok github.com/prometheus/prometheus/pkg/labels 8.238s
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
* Use array instead of map
Since MatchType is an iota type, we can safely use an array here.
This solution is even better:
name \ time/op old global_map stringer array
MatchType_String 53.6ns ± 1% 4.1ns ± 1% 2.8ns ± 1% 1.0ns ± 1%
name \ alloc/op old global_map stringer array
MatchType_String 0.00B 0.00B 0.00B 0.00B
name \ allocs/op old global_map stringer array
MatchType_String 0.00 0.00 0.00 0.00
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
* Benchmark all MatchType values
Co-authored-by: Ganesh Vernekar <15064823+codesome@users.noreply.github.com>
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
* Use constants for limits
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
Co-authored-by: Ganesh Vernekar <15064823+codesome@users.noreply.github.com>
Co-authored-by: Ganesh Vernekar <15064823+codesome@users.noreply.github.com>
121 lines
2.7 KiB
Go
121 lines
2.7 KiB
Go
// Copyright 2017 The Prometheus 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 labels
|
|
|
|
import (
|
|
"fmt"
|
|
)
|
|
|
|
// MatchType is an enum for label matching types.
|
|
type MatchType int
|
|
|
|
// Possible MatchTypes.
|
|
const (
|
|
MatchEqual MatchType = iota
|
|
MatchNotEqual
|
|
MatchRegexp
|
|
MatchNotRegexp
|
|
)
|
|
|
|
var matchTypeToStr = [...]string{
|
|
MatchEqual: "=",
|
|
MatchNotEqual: "!=",
|
|
MatchRegexp: "=~",
|
|
MatchNotRegexp: "!~",
|
|
}
|
|
|
|
func (m MatchType) String() string {
|
|
if m < MatchEqual || m > MatchNotRegexp {
|
|
panic("unknown match type")
|
|
}
|
|
return matchTypeToStr[m]
|
|
}
|
|
|
|
// Matcher models the matching of a label.
|
|
type Matcher struct {
|
|
Type MatchType
|
|
Name string
|
|
Value string
|
|
|
|
re *FastRegexMatcher
|
|
}
|
|
|
|
// NewMatcher returns a matcher object.
|
|
func NewMatcher(t MatchType, n, v string) (*Matcher, error) {
|
|
m := &Matcher{
|
|
Type: t,
|
|
Name: n,
|
|
Value: v,
|
|
}
|
|
if t == MatchRegexp || t == MatchNotRegexp {
|
|
re, err := NewFastRegexMatcher(v)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
m.re = re
|
|
}
|
|
return m, nil
|
|
}
|
|
|
|
// MustNewMatcher panics on error - only for use in tests!
|
|
func MustNewMatcher(mt MatchType, name, val string) *Matcher {
|
|
m, err := NewMatcher(mt, name, val)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return m
|
|
}
|
|
|
|
func (m *Matcher) String() string {
|
|
return fmt.Sprintf("%s%s%q", m.Name, m.Type, m.Value)
|
|
}
|
|
|
|
// Matches returns whether the matcher matches the given string value.
|
|
func (m *Matcher) Matches(s string) bool {
|
|
switch m.Type {
|
|
case MatchEqual:
|
|
return s == m.Value
|
|
case MatchNotEqual:
|
|
return s != m.Value
|
|
case MatchRegexp:
|
|
return m.re.MatchString(s)
|
|
case MatchNotRegexp:
|
|
return !m.re.MatchString(s)
|
|
}
|
|
panic("labels.Matcher.Matches: invalid match type")
|
|
}
|
|
|
|
// Inverse returns a matcher that matches the opposite.
|
|
func (m *Matcher) Inverse() (*Matcher, error) {
|
|
switch m.Type {
|
|
case MatchEqual:
|
|
return NewMatcher(MatchNotEqual, m.Name, m.Value)
|
|
case MatchNotEqual:
|
|
return NewMatcher(MatchEqual, m.Name, m.Value)
|
|
case MatchRegexp:
|
|
return NewMatcher(MatchNotRegexp, m.Name, m.Value)
|
|
case MatchNotRegexp:
|
|
return NewMatcher(MatchRegexp, m.Name, m.Value)
|
|
}
|
|
panic("labels.Matcher.Matches: invalid match type")
|
|
}
|
|
|
|
// GetRegexString returns the regex string.
|
|
func (m *Matcher) GetRegexString() string {
|
|
if m.re == nil {
|
|
return ""
|
|
}
|
|
return m.re.GetRegexString()
|
|
}
|