The cpu suddenly soared and dropped after a while

1. First of all, the business belongs to the web intranet business

2. According to the experience of jstack, see another article, there is no feature

3. Check the data monitored by the

jvm 4. It is found that the memory of the jvm is close to the maximum, and then the gc and cpu usage increases

5. Solve the problem of setting both xmx and xms to 4g, observe ok