我想用 rados 的 object 存储文件，用 LockShared 和 LockExclusive 实现了一个读写锁 但当我测速时发现 LockShared 性能好低啊,每秒 20 个，我以为只是延迟高，但发现并发也没用

func newConn() *rados.Conn {
	conn, err := rados.NewConn()
	if err != nil {
		panic(err)
	}
	cephInitByFile(conn, "k8s_conf")
	err = conn.Connect()
	if err != nil {
		panic(err)
	}
	return conn
}

func init() {
	conn = newConn()
}
func TestConcurrencyLockShared(t *testing.T) {
	// open a pool handle
	oid := "concurrency_lock_shared"
	oidLock := "lock"
	maxExpired := time.Minute
	times := 100
	wg := sync.WaitGroup{}
	wg.Add(times)
	for i := 0; i < times; i++ {
		go func(i int) {
			defer wg.Done()
			ioctx, err := conn.OpenIOContext(poolName)
			require.NoError(t, err)
			res, err := ioctx.LockShared(oid, oidLock, "cookie"+fmt.Sprint(i), "", "lock test", maxExpired, nil)
			assert.NoError(t, err)
			assert.Equal(t, 0, res)
		}(i)
	}
	wg.Wait()
	wg.Add(times)
	for i := 0; i < times; i++ {
		go func(i int) {
			defer wg.Done()
			ioctx, err := conn.OpenIOContext(poolName)
			require.NoError(t, err)
			res, err := ioctx.Unlock(oid, oidLock, "cookie"+fmt.Sprint(i))
			assert.NoError(t, err)
			assert.Equal(t, 0, res)
		}(i)
	}
	wg.Wait()
}