虚拟group 是不是最大只支持到 256 呢

group 设置到 300，就报错了。 设成 200 没问题

[2020-06-04 19:23:49] ERROR - file: db_op.c, line: 23, db error, error info: unable to allocate memory for mutex; resize mutex region [2020-06-04 19:23:49] ERROR - file: db_op.c, line: 154, db->open fail, errno: 12, error info: Cannot allocate memory