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/* Copyright (c) 2020 Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
// compare_benchmarks takes the JSON-formatted output of bssl speed and
// compares it against a baseline output.
package main
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"os"
)
var baselineFile = flag.String("baseline", "", "the path to the JSON file containing the base results")
type Result struct {
Description string `json:"description"`
NumCalls int `json:"numCalls"`
Microseconds int `json:"microseconds"`
BytesPerCall int `json:"bytesPerCall"`
}
func (r *Result) Speed() (float64, string) {
callsPerSecond := float64(r.NumCalls) / float64(r.Microseconds) * 1000000
if r.BytesPerCall == 0 {
return callsPerSecond, "ops/sec"
}
return callsPerSecond * float64(r.BytesPerCall) / 1000000, "MB/sec"
}
func printResult(result Result, baseline *Result) error {
if baseline != nil {
if result.Description != baseline.Description {
return fmt.Errorf("result did not match baseline: %q vs %q", result.Description, baseline.Description)
}
if result.BytesPerCall != baseline.BytesPerCall {
return fmt.Errorf("result %q bytes per call did not match baseline: %d vs %d", result.Description, result.BytesPerCall, baseline.BytesPerCall)
}
}
newSpeed, unit := result.Speed()
fmt.Printf("Did %d %s operations in %dus (%.1f %s)", result.NumCalls, result.Description, result.Microseconds, newSpeed, unit)
if baseline != nil {
oldSpeed, _ := baseline.Speed()
fmt.Printf(" [%+.1f%%]", (newSpeed-oldSpeed)/oldSpeed*100)
}
fmt.Printf("\n")
return nil
}
func readResults(path string) ([]Result, error) {
data, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
var ret []Result
if err := json.Unmarshal(data, &ret); err != nil {
return nil, err
}
return ret, nil
}
func main() {
flag.Parse()
baseline, err := readResults(*baselineFile)
if err != nil {
fmt.Fprintf(os.Stderr, "Error reading %q: %s\n", *baselineFile, err)
os.Exit(1)
}
fmt.Println(*baselineFile)
for _, result := range baseline {
if err := printResult(result, nil); err != nil {
fmt.Fprintf(os.Stderr, "Error in %q: %s\n", *baselineFile, err)
os.Exit(1)
}
}
for _, arg := range flag.Args() {
results, err := readResults(arg)
if err != nil {
fmt.Fprintf(os.Stderr, "Error reading %q: %s\n", arg, err)
os.Exit(1)
}
if len(results) != len(baseline) {
fmt.Fprintf(os.Stderr, "Result files %q and %q have different lengths\n", arg, *baselineFile)
os.Exit(1)
}
fmt.Printf("\n%s\n", arg)
for i, result := range results {
if err := printResult(result, &baseline[i]); err != nil {
fmt.Fprintf(os.Stderr, "Error in %q: %s\n", arg, err)
os.Exit(1)
}
}
}
}