在5.6中这是两个不同的参数
innodb_thread_concurrency ：InnoDB内部允许的最大线程数

而 thread_concurrency 在5.7上已经废除了其用途是：This variable is specific to Solaris 8 and earlier systems, for which mysqld invokes the thr_setconcurrency() function with the variable value. This function enables applications to give the threads system a hint about the desired number of threads that should be run at the same time. Current Solaris versions document this as having no effect.

不好意思点错了，非问题发起人竟然也能关闭问题，我也是醉了，之后我啥也点不了