package repository import ( "context" "io" "math/rand" "sync" "testing" "github.com/restic/restic/internal/crypto" "github.com/restic/restic/internal/restic" "github.com/restic/restic/internal/test" ) func randomID(rd io.Reader) restic.ID { id := restic.ID{} _, err := io.ReadFull(rd, id[:]) if err != nil { panic(err) } return id } const maxBlobSize = 1 << 20 func min(a, b int) int { if a < b { return a } return b } func fillPacks(t testing.TB, rnd *rand.Rand, pm *packerManager, buf []byte) (bytes int) { for i := 0; i < 102; i++ { l := rnd.Intn(maxBlobSize) id := randomID(rnd) buf = buf[:l] // Only change a few bytes so we know we're not benchmarking the RNG. rnd.Read(buf[:min(l, 4)]) n, err := pm.SaveBlob(context.TODO(), restic.DataBlob, id, buf, 0) if err != nil { t.Fatal(err) } if n != l+37 && n != l+37+36 { t.Errorf("Add() returned invalid number of bytes: want %v, got %v", l, n) } bytes += n } err := pm.Flush(context.TODO()) if err != nil { t.Fatal(err) } return bytes } const randomSeed = 23 var ( once sync.Once totalSize int64 ) func TestPackerManager(t *testing.T) { bytes := testPackerManager(t) once.Do(func() { totalSize = bytes }) } func testPackerManager(t testing.TB) int64 { rnd := rand.New(rand.NewSource(randomSeed)) savedBytes := int(0) pm := newPackerManager(crypto.NewRandomKey(), restic.DataBlob, DefaultPackSize, func(ctx context.Context, tp restic.BlobType, p *Packer) error { err := p.Finalize() if err != nil { return err } savedBytes += int(p.Size()) return nil }) blobBuf := make([]byte, maxBlobSize) bytes := fillPacks(t, rnd, pm, blobBuf) // bytes does not include the last packs header test.Equals(t, savedBytes, bytes+36) t.Logf("saved %d bytes", bytes) return int64(bytes) } func BenchmarkPackerManager(t *testing.B) { // Run testPackerManager if it hasn't run already, to set totalSize. once.Do(func() { totalSize = testPackerManager(t) }) rnd := rand.New(rand.NewSource(randomSeed)) blobBuf := make([]byte, maxBlobSize) t.ReportAllocs() t.SetBytes(totalSize) t.ResetTimer() for i := 0; i < t.N; i++ { rnd.Seed(randomSeed) pm := newPackerManager(crypto.NewRandomKey(), restic.DataBlob, DefaultPackSize, func(ctx context.Context, t restic.BlobType, p *Packer) error { return nil }) fillPacks(t, rnd, pm, blobBuf) } }