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内存瓶颈freefree是查看内存使用情况，包括物理内存、交换内存(swap)和内核缓冲区内存。free -h -s 3表示每隔三秒输出一次内存情况，命令如下[1014154@cc69dd4c5-4tdb5 ~]$ free total used free shared buff/cache ...

java问题排查命令

jps：查看java进程 jmap：导出堆详细信息（与jhat一起使用） jhat：分析Java堆的命令（与jmap一起使用） jstack：可以定位到线程堆栈，根据堆栈信息我们可以定位到具体代码，所以它在JVM性能调优中使用得非常多。通常结合 ps、top、printf、grep命令使用。 pr...

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