Golang lldb.NewAllocator函数代码示例

func create(f *os.File, filer lldb.Filer, opts *Options, isMem bool) (db *DB, err error) {
	defer func() {
		if db != nil {
			db.opts = opts
		}
	}()
	defer func() {
		lock := opts.lock
		if err != nil && lock != nil {
			lock.Close()
			db = nil
		}
	}()

	if err = opts.check(filer.Name(), true, !isMem); err != nil {
		return
	}

	b := [16]byte{byte(magic[0]), byte(magic[1]), byte(magic[2]), byte(magic[3]), 0x00} // ver 0x00
	if n, err := filer.WriteAt(b[:], 0); n != 16 {
		return nil, &os.PathError{Op: "kv.create.WriteAt", Path: filer.Name(), Err: err}
	}

	db = &DB{f: f, lock: opts.lock}

	if filer, err = opts.acidFiler(db, filer); err != nil {
		return nil, err
	}

	db.filer = filer
	if err = filer.BeginUpdate(); err != nil {
		return
	}

	defer func() {
		if e := filer.EndUpdate(); e != nil {
			if err == nil {
				err = e
			}
		}
	}()

	if db.alloc, err = lldb.NewAllocator(lldb.NewInnerFiler(filer, 16), &lldb.Options{}); err != nil {
		return nil, &os.PathError{Op: "kv.create", Path: filer.Name(), Err: err}
	}

	db.alloc.Compress = true
	db.isMem = isMem
	var h int64
	if db.root, h, err = lldb.CreateBTree(db.alloc, opts.Compare); err != nil {
		return
	}

	if h != 1 {
		panic("internal error")
	}

	db.wal = opts.wal
	return
}

func fillseq() {
	dbname := os.Args[0] + ".db"
	f, err := os.OpenFile(dbname, os.O_CREATE|os.O_EXCL|os.O_RDWR, 0666)
	if err != nil {
		log.Fatal(err)
	}

	defer func() {
		f.Close()
		os.Remove(f.Name())
	}()

	filer := lldb.NewSimpleFileFiler(f)
	a, err := lldb.NewAllocator(filer, &lldb.Options{})
	if err != nil {
		log.Println(err)
		return
	}

	a.Compress = true
	b, _, err := lldb.CreateBTree(a, nil)
	if err != nil {
		log.Println(err)
		return
	}

	var keys [N][16]byte
	for i := range keys {
		binary.BigEndian.PutUint32(keys[i][:], uint32(i))
	}

	debug.FreeOSMemory()
	t0 := time.Now()
	for _, key := range keys {
		if err = b.Set(key[:], value100); err != nil {
			log.Println(err)
			return
		}
	}
	if err := filer.Sync(); err != nil {
		log.Println(err)
		return
	}
	var ms runtime.MemStats
	runtime.ReadMemStats(&ms)

	d := time.Since(t0)
	fi, err := f.Stat()
	if err != nil {
		log.Println(err)
		return
	}

	secs := float64(d/time.Nanosecond) / float64(time.Second)
	sz := fi.Size()
	fmt.Printf("fillseq      :%19v/op;%7.1f MB/s (%g secs, %d bytes)\n", d/N, float64(sz)/secs/1e6, secs, sz)
	nn, bytes := bufs.GCache.Stats()
	fmt.Printf("%d %d\n", nn, bytes)
	fmt.Printf("%+v\n", ms)
}

func (s *file) CreateTemp(asc bool) (bt temp, err error) {
	f, err := ioutil.TempFile("", "ql-tmp-")
	if err != nil {
		return nil, err
	}

	fn := f.Name()
	filer := lldb.NewSimpleFileFiler(f)
	a, err := lldb.NewAllocator(filer, &lldb.Options{})
	if err != nil {
		f.Close()
		os.Remove(fn)
		return nil, err
	}

	t, _, err := lldb.CreateBTree(a, lldbCollators[asc])
	if err != nil {
		f.Close()
		os.Remove(fn)
		return nil, err
	}

	return &fileTemp{
		a: a,
		f: f,
		t: t,
	}, nil
}

func (s *file) CreateTemp(asc bool) (bt temp, err error) {
	f, err := s.tempFile("", "ql-tmp-")
	if err != nil {
		return nil, err
	}

	fn := f.Name()
	filer := lldb.NewOSFiler(f)
	a, err := lldb.NewAllocator(filer, &lldb.Options{})
	if err != nil {
		f.Close()
		os.Remove(fn)
		return nil, err
	}

	k := 1
	if !asc {
		k = -1
	}

	t, _, err := lldb.CreateBTree(a, func(a, b []byte) int { //TODO w/ error return
		da, err := lldb.DecodeScalars(a)
		if err != nil {
			log.Panic(err)
		}

		if err = s.expandBytes(da); err != nil {
			log.Panic(err)
		}

		db, err := lldb.DecodeScalars(b)
		if err != nil {
			log.Panic(err)
		}

		if err = s.expandBytes(db); err != nil {
			log.Panic(err)
		}

		return k * collate(da, db)
	})
	if err != nil {
		f.Close()
		if fn != "" {
			os.Remove(fn)
		}
		return nil, err
	}

	x := &fileTemp{file: &file{
		a:     a,
		codec: newGobCoder(),
		f0:    f,
	},
		t: t}
	return x, nil
}

func open00(name string, in *DB) (db *DB, err error) {
	db = in
	if db.alloc, err = lldb.NewAllocator(lldb.NewInnerFiler(db.filer, 16), &lldb.Options{}); err != nil {
		return nil, &os.PathError{Op: "dbm.Open", Path: name, Err: err}
	}

	db.alloc.Compress = true
	return db, db.boot()
}

func TestProf(t *testing.T) {
	dbname := os.Args[0] + ".db"
	f, err := os.OpenFile(dbname, os.O_CREATE|os.O_EXCL|os.O_RDWR, 0666)
	if err != nil {
		t.Fatal(err)
	}

	defer func() {
		f.Close()
		os.Remove(f.Name())
	}()

	filer := lldb.NewSimpleFileFiler(f) // file
	//filer := lldb.NewMemFiler()         // mem
	a, err := lldb.NewAllocator(filer, &lldb.Options{})
	if err != nil {
		t.Error(err)
		return
	}

	a.Compress = true
	b, _, err := lldb.CreateBTree(a, nil)
	if err != nil {
		t.Error(err)
		return
	}

	var key [16]byte
	for i := uint32(0); int(i) < 1e6; i++ {
		binary.BigEndian.PutUint32(key[:], i)
		if err = b.Set(key[:], value100); err != nil {
			t.Error(err)
			return
		}
	}
	var ms runtime.MemStats
	runtime.ReadMemStats(&ms)
	bufsU, bufsT, bytesU, bytesT, h, m := a.CacheStats()
	const p = 100.0
	t.Logf(
		"cache: buffers %d/%d(%.1f%%), bytes %d/%d(%.1f%%), hits %d(%.1f%%), misses %d(%.1f%%)",
		bufsU, bufsT, p*float64(bufsU)/float64(bufsT),
		bytesU, bytesT, p*float64(bytesU)/float64(bytesT),
		h, p*float64(h)/float64(h+m),
		m, p*float64(m)/float64(h+m),
	)
	nn, bts := bufs.GCache.Stats()
	t.Logf("bufs.GCache.Stats() {%d, %d}", nn, bts)
	t.Logf("%+v\n", ms)
}

func verifyDbFile(fn string) error {
	f, err := os.Open(fn) // O_RDONLY
	if err != nil {
		return err
	}

	defer f.Close()

	a, err := lldb.NewAllocator(lldb.NewInnerFiler(lldb.NewSimpleFileFiler(f), 16), &lldb.Options{})
	if err != nil {
		return err
	}

	return verifyAllocator(a)
}

func create(f *os.File, filer lldb.Filer, opts *Options, isMem bool) (db *DB, err error) {
	defer func() {
		lock := opts.lock
		if err != nil && lock != nil {
			n := lock.Name()
			lock.Close()
			os.Remove(n)
			db = nil
		}
	}()

	if err = opts.check(filer.Name(), true, !isMem); err != nil {
		return
	}

	b := [16]byte{byte(magic[0]), byte(magic[1]), byte(magic[2]), byte(magic[3]), 0x00} // ver 0x00
	if n, err := filer.WriteAt(b[:], 0); n != 16 {
		return nil, &os.PathError{Op: "dbm.Create.WriteAt", Path: filer.Name(), Err: err}
	}

	db = &DB{emptySize: 128, f: f, lock: opts.lock, closed: make(chan bool)}

	if filer, err = opts.acidFiler(db, filer); err != nil {
		return nil, err
	}

	db.filer = filer
	if err = filer.BeginUpdate(); err != nil {
		return
	}

	defer func() {
		if e := filer.EndUpdate(); e != nil {
			if err == nil {
				err = e
			}
		}
	}()

	if db.alloc, err = lldb.NewAllocator(lldb.NewInnerFiler(filer, 16), &lldb.Options{}); err != nil {
		return nil, &os.PathError{Op: "dbm.Create", Path: filer.Name(), Err: err}
	}

	db.alloc.Compress = compress
	db.isMem = isMem
	return db, db.boot()
}

func BenchmarkMem(b *testing.B) {
	f, err := ioutil.TempFile("", "")
	if err != nil {
		b.Fatal(err)
	}

	defer func() {
		f.Close()
		os.Remove(f.Name())
	}()

	filer := lldb.NewSimpleFileFiler(f)
	a, err := lldb.NewAllocator(filer, &lldb.Options{})
	if err != nil {
		b.Error(err)
		return
	}

	a.Compress = true

	t, _, err := lldb.CreateBTree(a, nil)
	if err != nil {
		b.Error(err)
		return
	}

	b.ResetTimer()
	var key [16]byte
	for i := uint32(0); int(i) < b.N; i++ {
		binary.BigEndian.PutUint32(key[:], i)
		if err = t.Set(key[:], value100); err != nil {
			b.Error(err)
			return
		}
	}

	if err := filer.Sync(); err != nil {
		b.Error(err)
		return
	}
}

func newFileFromOSFile(f lldb.OSFile) (fi *file, err error) {
	nm := lockName(f.Name())
	lck, err := lock.Lock(nm)
	if err != nil {
		if lck != nil {
			lck.Close()
		}
		return nil, err
	}

	close := true
	defer func() {
		if close && lck != nil {
			lck.Close()
		}
	}()

	var w *os.File
	closew := false
	wn := walName(f.Name())
	w, err = os.OpenFile(wn, os.O_CREATE|os.O_EXCL|os.O_RDWR, 0666)
	closew = true
	defer func() {
		if closew {
			nm := w.Name()
			w.Close()
			os.Remove(nm)
			w = nil
		}
	}()

	if err != nil {
		if !os.IsExist(err) {
			return nil, err
		}

		closew = false
		w, err = os.OpenFile(wn, os.O_RDWR, 0666)
		if err != nil {
			return nil, err
		}

		closew = true
		st, err := w.Stat()
		if err != nil {
			return nil, err
		}

		if st.Size() != 0 {
			return nil, fmt.Errorf("non empty WAL file %s exists", wn)
		}
	}

	info, err := f.Stat()
	if err != nil {
		return nil, err
	}

	switch sz := info.Size(); {
	case sz == 0:
		b := make([]byte, 16)
		copy(b, []byte(magic))
		if _, err := f.Write(b); err != nil {
			return nil, err
		}

		filer := lldb.Filer(lldb.NewOSFiler(f))
		filer = lldb.NewInnerFiler(filer, 16)
		if filer, err = lldb.NewACIDFiler(filer, w); err != nil {
			return nil, err
		}

		a, err := lldb.NewAllocator(filer, &lldb.Options{})
		if err != nil {
			return nil, err
		}

		a.Compress = true
		s := &file{
			a:     a,
			codec: newGobCoder(),
			f0:    f,
			f:     filer,
			lck:   lck,
			name:  f.Name(),
			wal:   w,
		}
		if err = s.BeginTransaction(); err != nil {
			return nil, err
		}

		h, err := s.Create()
		if err != nil {
			return nil, err
		}

		if h != 1 { // root
			log.Panic("internal error")
		}

//.........这里部分代码省略.........

func main0(fn string, oMax int, w func(s string, a ...interface{}), oStat bool, first, last string, dump bool, oBuckets bool) error {
	f, err := os.Open(fn) // O_RDONLY
	if err != nil {
		return err
	}

	defer f.Close()

	bits, err := ioutil.TempFile("", "kvaudit-")
	if err != nil {
		return err
	}

	defer func() {
		nm := bits.Name()
		bits.Close()
		os.Remove(nm)
	}()

	a, err := lldb.NewAllocator(lldb.NewInnerFiler(lldb.NewSimpleFileFiler(f), 16), &lldb.Options{})
	if err != nil {
		return err
	}

	cnt := 0
	var stats lldb.AllocStats
	err = a.Verify(lldb.NewSimpleFileFiler(bits), func(err error) bool {
		cnt++
		w("%d: %v\n", cnt, err)
		return cnt < oMax
	}, &stats)
	if err != nil {
		return err
	}

	if oStat {
		w("Handles     %10d  // total valid handles in use\n", stats.Handles)
		w("Compression %10d  // number of compressed blocks\n", stats.Compression)
		w("TotalAtoms  %10d  // total number of atoms == AllocAtoms + FreeAtoms\n", stats.TotalAtoms)
		w("AllocBytes  %10d  // bytes allocated (after decompression, if/where used)\n", stats.AllocBytes)
		w("AllocAtoms  %10d  // atoms allocated/used, including relocation atoms\n", stats.AllocAtoms)
		w("Relocations %10d  // number of relocated used blocks\n", stats.Relocations)
		w("FreeAtoms   %10d  // atoms unused\n", stats.FreeAtoms)
	}
	if oBuckets {
		var alloc, free [14]int64
		sizes := [14]int64{1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 4112}
		for atoms, cnt := range stats.AllocMap {
			if atoms >= 4096 {
				alloc[13] += cnt
				continue
			}

			for i := range sizes {
				if sizes[i+1] > atoms {
					alloc[i] += cnt
					break
				}
			}
		}
		for atoms, cnt := range stats.FreeMap {
			if atoms > 4096 {
				free[13] += cnt
				continue
			}

			for i := range sizes {
				if sizes[i+1] > atoms {
					free[i] += cnt
					break
				}
			}
		}
		w("Alloc blocks\n")
		for i, v := range alloc {
			w("%4d: %10d\n", sizes[i], v)
		}
		w("Free blocks\n")
		for i, v := range free {
			w("%4d: %10d\n", sizes[i], v)
		}
	}

	if !(first != "" || last != "" || dump) {
		return nil
	}

	t, err := lldb.OpenBTree(a, nil, 1)
	if err != nil {
		return err
	}

	dw := bufio.NewWriter(os.Stdout)
	defer dw.Flush()

	var e *lldb.BTreeEnumerator
	switch {
	case first != "":
		e, _, err = t.Seek([]byte(first))
	default:
//.........这里部分代码省略.........

func main0(fn string, oMax int, w func(s string, a ...interface{}), oStat bool, first, last string, dump bool) error {
	f, err := os.Open(fn) // O_RDONLY
	if err != nil {
		return err
	}

	defer f.Close()

	bits, err := ioutil.TempFile("", "kvaudit-")
	if err != nil {
		return err
	}

	defer bits.Close()

	a, err := lldb.NewAllocator(lldb.NewInnerFiler(lldb.NewSimpleFileFiler(f), 16), &lldb.Options{})
	if err != nil {
		return err
	}

	cnt := 0
	var stats lldb.AllocStats
	err = a.Verify(lldb.NewSimpleFileFiler(bits), func(err error) bool {
		cnt++
		w("%d: %v\n", cnt, err)
		return cnt < oMax
	}, &stats)
	if oStat {
		w("%#v\n", &stats)
	}
	if err != nil {
		return err
	}

	if !(first != "" || last != "" || dump) {
		return nil
	}

	t, err := lldb.OpenBTree(a, nil, 1)
	if err != nil {
		return err
	}

	dw := bufio.NewWriter(os.Stdout)
	defer dw.Flush()

	var e *lldb.BTreeEnumerator
	switch {
	case first != "":
		e, _, err = t.Seek([]byte(first))
	default:
		e, err = t.SeekFirst()
	}
	if err != nil {
		if err == io.EOF {
			err = nil
		}
		return err
	}

	blast := []byte(last)
	sep := []byte("->")
	for {
		k, v, err := e.Next()
		if err != nil {
			if err == io.EOF {
				err = nil
			}
			return err
		}

		dw.WriteString(fmt.Sprintf("+%d,%d:", len(k), len(v)))
		dw.Write(k)
		dw.Write(sep)
		dw.Write(v)
		dw.WriteByte('\n')

		if len(blast) != 0 && bytes.Compare(k, blast) >= 0 {
			break
		}
	}

	return nil
}