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// Copyright 2018 The Bazel Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package starlark_test
import (
"bytes"
"io/ioutil"
"path/filepath"
"strings"
"testing"
"go.starlark.net/starlark"
"go.starlark.net/starlarktest"
)
func Benchmark(b *testing.B) {
testdata := starlarktest.DataFile("starlark", ".")
thread := new(starlark.Thread)
for _, file := range []string{
"testdata/benchmark.star",
// ...
} {
filename := filepath.Join(testdata, file)
// Evaluate the file once.
globals, err := starlark.ExecFile(thread, filename, nil, nil)
if err != nil {
reportEvalError(b, err)
}
// Repeatedly call each global function named bench_* as a benchmark.
for _, name := range globals.Keys() {
value := globals[name]
if fn, ok := value.(*starlark.Function); ok && strings.HasPrefix(name, "bench_") {
b.Run(name, func(b *testing.B) {
for i := 0; i < b.N; i++ {
_, err := starlark.Call(thread, fn, nil, nil)
if err != nil {
reportEvalError(b, err)
}
}
})
}
}
}
}
// BenchmarkProgram measures operations relevant to compiled programs.
// TODO(adonovan): use a bigger testdata program.
func BenchmarkProgram(b *testing.B) {
// Measure time to read a source file (approx 600us but depends on hardware and file system).
filename := starlarktest.DataFile("starlark", "testdata/paths.star")
var src []byte
b.Run("read", func(b *testing.B) {
for i := 0; i < b.N; i++ {
var err error
src, err = ioutil.ReadFile(filename)
if err != nil {
b.Fatal(err)
}
}
})
// Measure time to turn a source filename into a compiled program (approx 450us).
var prog *starlark.Program
b.Run("compile", func(b *testing.B) {
for i := 0; i < b.N; i++ {
var err error
_, prog, err = starlark.SourceProgram(filename, src, starlark.StringDict(nil).Has)
if err != nil {
b.Fatal(err)
}
}
})
// Measure time to encode a compiled program to a memory buffer
// (approx 20us; was 75-120us with gob encoding).
var out bytes.Buffer
b.Run("encode", func(b *testing.B) {
for i := 0; i < b.N; i++ {
out.Reset()
if err := prog.Write(&out); err != nil {
b.Fatal(err)
}
}
})
// Measure time to decode a compiled program from a memory buffer
// (approx 20us; was 135-250us with gob encoding)
b.Run("decode", func(b *testing.B) {
for i := 0; i < b.N; i++ {
in := bytes.NewReader(out.Bytes())
if _, err := starlark.CompiledProgram(in); err != nil {
b.Fatal(err)
}
}
})
}