1 files changed, 26 insertions, 5 deletions
diff --git a/src/pkg/compress/lzw/writer_test.go b/src/pkg/compress/lzw/writer_test.go
index 715b974aa..e5815a03d 100644
--- a/src/pkg/compress/lzw/writer_test.go
+++ b/src/pkg/compress/lzw/writer_test.go
@@ -8,6 +8,7 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
+	"runtime"
 	"testing"
 )
 
@@ -20,7 +21,7 @@ var filenames = []string{
 // the given options yields equivalent bytes to the original file.
 func testFile(t *testing.T, fn string, order Order, litWidth int) {
 	// Read the file, as golden output.
-	golden, err := os.Open(fn, os.O_RDONLY, 0400)
+	golden, err := os.Open(fn)
 	if err != nil {
 		t.Errorf("%s (order=%d litWidth=%d): %v", fn, order, litWidth, err)
 		return
@@ -28,7 +29,7 @@ func testFile(t *testing.T, fn string, order Order, litWidth int) {
 	defer golden.Close()
 
 	// Read the file again, and push it through a pipe that compresses at the write end, and decompresses at the read end.
-	raw, err := os.Open(fn, os.O_RDONLY, 0400)
+	raw, err := os.Open(fn)
 	if err != nil {
 		t.Errorf("%s (order=%d litWidth=%d): %v", fn, order, litWidth, err)
 		return
@@ -99,13 +100,33 @@ func TestWriter(t *testing.T) {
 	}
 }
 
-func BenchmarkEncoder(b *testing.B) {
+func benchmarkEncoder(b *testing.B, n int) {
 	b.StopTimer()
-	buf, _ := ioutil.ReadFile("../testdata/e.txt")
+	b.SetBytes(int64(n))
+	buf0, _ := ioutil.ReadFile("../testdata/e.txt")
+	buf0 = buf0[:10000]
+	buf1 := make([]byte, n)
+	for i := 0; i < n; i += len(buf0) {
+		copy(buf1[i:], buf0)
+	}
+	buf0 = nil
+	runtime.GC()
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		w := NewWriter(devNull{}, LSB, 8)
-		w.Write(buf)
+		w.Write(buf1)
 		w.Close()
 	}
 }
+
+func BenchmarkEncoder1e4(b *testing.B) {
+	benchmarkEncoder(b, 1e4)
+}
+
+func BenchmarkEncoder1e5(b *testing.B) {
+	benchmarkEncoder(b, 1e5)
+}
+
+func BenchmarkEncoder1e6(b *testing.B) {
+	benchmarkEncoder(b, 1e6)
+}