Benchmark all compression levels.

bench_test.go

@@ -1,135 +0,0 @@
-// The tests in this file are copied from the compress/flate package.
-
-// Copyright 2012 The Go Authors. All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//    * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//    * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//    * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package brotli
-
-import (
-	"bytes"
-	"io"
-	"io/ioutil"
-	"runtime"
-	"testing"
-)
-
-var suites = []struct{ name, file string }{
-	// Digits is the digits of the irrational number e. Its decimal representation
-	// does not repeat, but there are only 10 possible digits, so it should be
-	// reasonably compressible.
-	{"Digits", "testdata/e.txt"},
-	// Newton is Isaac Newtons's educational text on Opticks.
-	{"Newton", "testdata/Isaac.Newton-Opticks.txt"},
-}
-
-func BenchmarkDecode(b *testing.B) {
-	doBench(b, func(b *testing.B, buf0 []byte, level, n int) {
-		b.ReportAllocs()
-		b.StopTimer()
-		b.SetBytes(int64(n))
-
-		compressed := new(bytes.Buffer)
-		w := NewWriterLevel(compressed, level)
-		for i := 0; i < n; i += len(buf0) {
-			if len(buf0) > n-i {
-				buf0 = buf0[:n-i]
-			}
-			io.Copy(w, bytes.NewReader(buf0))
-		}
-		w.Close()
-		buf1 := compressed.Bytes()
-		buf0, compressed, w = nil, nil, nil
-		runtime.GC()
-		b.StartTimer()
-		for i := 0; i < b.N; i++ {
-			io.Copy(ioutil.Discard, NewReader(bytes.NewReader(buf1)))
-		}
-	})
-}
-
-var levelTests = []struct {
-	name  string
-	level int
-}{
-	{"Speed", BestSpeed},
-	{"Default", DefaultCompression},
-	{"Compression", BestCompression},
-}
-
-var sizes = []struct {
-	name string
-	n    int
-}{
-	{"1e4", 1e4},
-	{"1e5", 1e5},
-	{"1e6", 1e6},
-}
-
-func doBench(b *testing.B, f func(b *testing.B, buf []byte, level, n int)) {
-	for _, suite := range suites {
-		buf, err := ioutil.ReadFile(suite.file)
-		if err != nil {
-			b.Fatal(err)
-		}
-		if len(buf) == 0 {
-			b.Fatalf("test file %q has no data", suite.file)
-		}
-		for _, l := range levelTests {
-			for _, s := range sizes {
-				b.Run(suite.name+"/"+l.name+"/"+s.name, func(b *testing.B) {
-					f(b, buf, l.level, s.n)
-				})
-			}
-		}
-	}
-}
-
-func BenchmarkEncode(b *testing.B) {
-	doBench(b, func(b *testing.B, buf0 []byte, level, n int) {
-		b.ReportAllocs()
-		b.StopTimer()
-		b.SetBytes(int64(n))
-
-		buf1 := make([]byte, n)
-		for i := 0; i < n; i += len(buf0) {
-			if len(buf0) > n-i {
-				buf0 = buf0[:n-i]
-			}
-			copy(buf1[i:], buf0)
-		}
-		buf0 = nil
-		w := NewWriterLevel(ioutil.Discard, level)
-		runtime.GC()
-		b.StartTimer()
-		for i := 0; i < b.N; i++ {
-			w.Reset(ioutil.Discard)
-			w.Write(buf1)
-			w.Close()
-		}
-	})
-}

brotli_test.go

@@ -430,3 +430,67 @@ func Decode(encodedData []byte) ([]byte, error) {
 	r := NewReader(bytes.NewReader(encodedData))
 	return ioutil.ReadAll(r)
 }
+
+func BenchmarkEncodeLevels(b *testing.B) {
+	opticks, err := ioutil.ReadFile("testdata/Isaac.Newton-Opticks.txt")
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	for level := BestSpeed; level <= BestCompression; level++ {
+		b.Run(fmt.Sprintf("%d", level), func(b *testing.B) {
+			b.ReportAllocs()
+			b.SetBytes(int64(len(opticks)))
+			for i := 0; i < b.N; i++ {
+				w := NewWriterLevel(ioutil.Discard, level)
+				w.Write(opticks)
+				w.Close()
+			}
+		})
+	}
+}
+
+func BenchmarkEncodeLevelsReset(b *testing.B) {
+	opticks, err := ioutil.ReadFile("testdata/Isaac.Newton-Opticks.txt")
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	for level := BestSpeed; level <= BestCompression; level++ {
+		buf := new(bytes.Buffer)
+		w := NewWriterLevel(buf, level)
+		w.Write(opticks)
+		w.Close()
+		b.Run(fmt.Sprintf("%d(%.1f%%)", level, float64(buf.Len())/float64(len(opticks))*100), func(b *testing.B) {
+			b.ReportAllocs()
+			b.SetBytes(int64(len(opticks)))
+			for i := 0; i < b.N; i++ {
+				w.Reset(ioutil.Discard)
+				w.Write(opticks)
+				w.Close()
+			}
+		})
+	}
+}
+
+func BenchmarkDecodeLevels(b *testing.B) {
+	opticks, err := ioutil.ReadFile("testdata/Isaac.Newton-Opticks.txt")
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	for level := BestSpeed; level <= BestCompression; level++ {
+		buf := new(bytes.Buffer)
+		w := NewWriterLevel(buf, level)
+		w.Write(opticks)
+		w.Close()
+		compressed := buf.Bytes()
+		b.Run(fmt.Sprintf("%d", level), func(b *testing.B) {
+			b.ReportAllocs()
+			b.SetBytes(int64(len(opticks)))
+			for i := 0; i < b.N; i++ {
+				io.Copy(ioutil.Discard, NewReader(bytes.NewReader(compressed)))
+			}
+		})
+	}
+}