The resource is exhausted and the user cannot log on

Problem:

If the resource is exhausted, the user will not get in, whether it is remote ssh, or Su, will not go in, see the following situation:

[Oracle@zy ~]$ ssh 172.16.1.13

Write Failed:broken Pipe

[Zhuying@zy ~]$ Su-oracle

Password:
Su:cannot set user Id:resource temporarily unavailable

Workaround:

Finally, only by killing part of the process, to enter, the corresponding application to restart, release resources ~

Org.apache.tomcat.util.threads.ThreadPool Logfull

Subsequent optimization scenarios:

System tuning