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// Copyright 2022 The Tint 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
//
// https://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 bench provides types and methods for parsing Google benchmark results.
package bench
import (
"encoding/json"
"errors"
"fmt"
"regexp"
"strconv"
"strings"
"time"
)
// Test holds the results of a single benchmark test.
type Test struct {
Name string
NumTasks uint
NumThreads uint
Duration time.Duration
Iterations uint
}
var testVarRE = regexp.MustCompile(`([\w])+:([0-9]+)`)
func (t *Test) parseName() {
for _, match := range testVarRE.FindAllStringSubmatch(t.Name, -1) {
if len(match) != 3 {
continue
}
n, err := strconv.Atoi(match[2])
if err != nil {
continue
}
switch match[1] {
case "threads":
t.NumThreads = uint(n)
case "tasks":
t.NumTasks = uint(n)
}
}
}
// Benchmark holds a set of benchmark test results.
type Benchmark struct {
Tests []Test
}
// Parse parses the benchmark results from the string s.
// Parse will handle the json and 'console' formats.
func Parse(s string) (Benchmark, error) {
type Parser = func(s string) (Benchmark, error)
for _, parser := range []Parser{parseConsole, parseJSON} {
b, err := parser(s)
switch err {
case nil:
return b, nil
case errWrongFormat:
default:
return Benchmark{}, err
}
}
return Benchmark{}, errors.New("Unrecognised file format")
}
var errWrongFormat = errors.New("Wrong format")
var consoleLineRE = regexp.MustCompile(`([\w/:]+)\s+([0-9]+(?:.[0-9]+)?) ns\s+[0-9]+(?:.[0-9]+) ns\s+([0-9]+)`)
func parseConsole(s string) (Benchmark, error) {
blocks := strings.Split(s, "------------------------------------------------------------------------------------------")
if len(blocks) != 3 {
return Benchmark{}, errWrongFormat
}
lines := strings.Split(blocks[2], "\n")
b := Benchmark{
Tests: make([]Test, 0, len(lines)),
}
for _, line := range lines {
if len(line) == 0 {
continue
}
matches := consoleLineRE.FindStringSubmatch(line)
if len(matches) != 4 {
return Benchmark{}, fmt.Errorf("Unable to parse the line:\n" + line)
}
ns, err := strconv.ParseFloat(matches[2], 64)
if err != nil {
return Benchmark{}, fmt.Errorf("Unable to parse the duration: " + matches[2])
}
iterations, err := strconv.Atoi(matches[3])
if err != nil {
return Benchmark{}, fmt.Errorf("Unable to parse the number of iterations: " + matches[3])
}
t := Test{
Name: matches[1],
Duration: time.Nanosecond * time.Duration(ns),
Iterations: uint(iterations),
}
t.parseName()
b.Tests = append(b.Tests, t)
}
return b, nil
}
func parseJSON(s string) (Benchmark, error) {
type T struct {
Name string `json:"name"`
Iterations uint `json:"iterations"`
Time float64 `json:"real_time"`
}
type B struct {
Tests []T `json:"benchmarks"`
}
b := B{}
d := json.NewDecoder(strings.NewReader(s))
if err := d.Decode(&b); err != nil {
return Benchmark{}, err
}
out := Benchmark{
Tests: make([]Test, len(b.Tests)),
}
for i, test := range b.Tests {
t := Test{
Name: test.Name,
Duration: time.Nanosecond * time.Duration(int64(test.Time)),
Iterations: test.Iterations,
}
t.parseName()
out.Tests[i] = t
}
return out, nil
}