The rest of the CPU was just overhead waiting for database and network related IO.
剩余的CPU开销只是在等待数据库和网络相关的IO。
Tomcat uses NIO (Non-blocking IO) to keep the connection alive without wasting the waiting threads.
Tomcat 使用 NIO（无阻塞 IO）来保持连接活动，无需浪费等待中的线程。
IOWaittime: the time elapsed in waiting for the IO.
IOWaittime：等待io花费的时间。
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