我正在做性能测试。当我达到 100-200 个并发用户时，MySQL只需关闭并重新启动，日志文件中没有任何错误。非常非常奇怪。MySQL版本是 5.6.34，在CentOS 6. 这是我如何配置它：
[mysqld]
innodb_buffer_pool_size = 512M
max_connections = 9000
innodb_thread_concurrency = 0
innodb_read_io_threads = 64
innodb_write_io_threads = 64
innodb_io_capacity = 5000
datadir = /data/mysql
socket = /data/mysql/mysql.sock
sql_mode=NO_ENGINE_SUBSTITUTION
这是如何MySQL开始的：
170212 19:06:15 mysqld_safe Number of processes running now: 0
170212 19:06:15 mysqld_safe mysqld restarted
2017-02-12 19:06:19 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2017-02-12 19:06:19 0 [Note] …