CPU使用率过高，容易引起服务响应速度变慢、服务器登录不上等问题。可以创建 CPU使用率阈值告警，当 CPU 使用率超过阈值时，将及时通知管理员
CPU使用率过高排查的步骤大致为：定位消耗 CPU的具体进程，对 CPU占用率高的进程进行分析。如果为异常进程，可能是病毒或木马导致，可以自行终止进程，或者使用安全软件进行查杀；如果是业务进程，则需要分析是否由于访问量变化引起，是否存在优化空间；
下面将介绍 Linux 系统下如何定位出 CPU 使用率过高的进程。
定位工具介绍：top 命令
top：Linux 系统下常用的监控工具，用于实时获取进程级别的 CPU使用情况。下图是 top 命令的输出信息。
上半部分显示 CPU 和内存资源的总体使用情况：
第一行：系统当前时间，当前登录用户个数以及系统负载。
第二行：系统总进程数、运行中进程数、休眠、睡眠和僵尸进程数量。
第三行：CPU 当前使用情况。
第四行：内存当前使用情况。
第五行：swap 空间当前使用情况。
下半部分以进程为维度显示资源的占用情况。
PID：进程 ID。
USER：进程所有者。
PR：进程优先级 NI：NICE 值，NICE 值越小，优先级越高。
VIRT：使用的虚拟内存大小，单位 KB。
RES：当前使用的内存大小，单位 KB。
SHR：使用的共享内存的大小，单位 KB。
S：进程状态。
%CPU：更新时间间隔内进程所使用的 CPU 时间的百分比。
%MEM：更新时间间隔内进程所使用的内存的百分比。
TIME+：进程使用的 CPU 时间，精确到 0.01s。
COMMAND：进程名称。
问题定位及处理
使用工具定位 CPU 使用率高的进程
前面介绍了 top 工具，下面介绍如何利用该工具定位出 CPU 使用率高的进程。
- 通过 SSH 或者 VNC 方式登录服务器
说明：CPU 使用率过高，容易引起服务器登录不上，此时可以尝试使用 VNC 登录的方式。 - 输入 top 命令查看系统负载。
- 输入大写 P，进程按 CPU 使用率降序排列；通过排序，可以方便得获得占用 CPU 资源较多的进程，进行进一步的分析。
4.分析占用 CPU 高的进程。
- 如果为业务进程，建议分析业务程序是否有优化空间，进行优化或者提升实例的资源配置。
- 如果为异常进程，实例可能中毒，可以自行终止进程、使用安全软件进行查杀或者进行数据备份后，重装系统。
使用 top 命令结束进程
- 键入小写 k，输入想要结束进程的 pid（默认为排序第一的进程），回车。
2. 操作成功，界面会出现 Send pid 984 signal [15/sigterm] 的提示信息，回车确认即可。
此教程来自固定链接：http://www.rakbuluo.com/p25/
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