ECS内存占用高，wordpress数据库经常挂掉求大神指点

mysql经常挂掉，网站是用wordpress建设的，已经在wp-config.php写入 以下代码/* PHP Memory */define( 'WP_MEMORY_LIMIT', '32' );define( 'WP_MAX_MEMORY_LIMIT', '64' );php-fpm.conf也修改了pm.start_servers、pm.min_spare_servers、pm.max_spare_servers等项，然后好过一段时间。修改后从每天挂一次变为一周挂一次，但最近又成了每天必挂，重启服务器又全部恢复 。
服务器的配置：CPU： 1核    内存： 1024 MB 带宽：1Mbps



mysql日志：

2015-12-28 19:59:59 8218 [Note] Binlog end
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'partition'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'BLACKHOLE'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_SYS_TABLES'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_FT_CONFIG'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_FT_DELETED'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_METRICS'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_CMPMEM'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_CMP_RESET'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_CMP'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_LOCKS'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'INNODB_TRX'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'ARCHIVE'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'MyISAM'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'CSV'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'MRG_MYISAM'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'MEMORY'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'sha256_password'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'mysql_old_password'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'mysql_native_password'
2015-12-28 19:59:59 8218 [Note] Shutting down plugin 'binlog'
2015-12-28 19:59:59 8218 [Note] /alidata/server/mysql/bin/mysqld: Shutdown complete


151228 19:59:59 mysqld_safe mysqld from pid file /alidata/server/mysql/data/iZ94vpkfebdZ.pid ended  
2015-12-29 12:52:49

售后客服说是第三方软件问题超出服务范围，求哪位大神给个解决方案，万分感激！