搭建wordpress的mysql老是挂掉，怎么关闭innodb

wordpress的mysql老是挂掉，只要在后台操作一下马上就挂！！！
配置：centos7+nginx+php+sql 5.5  

1G内存+40G硬盘。


网站总显示 数据库链接不上，重启下就好了，但是很快又不行。现在几个问题：
1.有的说wordpress吃内存，但是我用 free -m 查看，内存还有好几百
2.有的说禁用innodb，但是我的my.inf 文件里面 innodb 行前面都是#注释过的，是不是意味着已经是禁用innodb的？
3.有的说禁用sql 日志可以解决，求解方法


贴一段 sql错误日志：


170907 15:51:36 mysqld_safe mysqld from pid file /alidata/server/mysql/data/izbp10q83mb4gk3r1q4m3rz.pid ended
170907 15:53:08 mysqld_safe Starting mysqld daemon with databases from /alidata/server/mysql/data
170907 15:53:09 [Note] Plugin 'FEDERATED' is disabled.
170907 15:53:09 InnoDB: The InnoDB memory heap is disabled
170907 15:53:09 InnoDB: Mutexes and rw_locks use GCC atomic builtins
170907 15:53:09 InnoDB: Compressed tables use zlib 1.2.3
170907 15:53:09 InnoDB: Using Linux native AIO
170907 15:53:09 InnoDB: Initializing buffer pool, size = 128.0M
170907 15:53:09 InnoDB: Completed initialization of buffer pool
170907 15:53:09 InnoDB: highest supported file format is Barracuda.
InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
170907 15:53:09  InnoDB: Database was not shut down normally!