Java heap memory parameter tuning

Some performance tuning articles suggest adjusting the - Xms and - Xmx parameters to the same value, considering that there is only one Java application on the physical server, and there is no need to gradually adjust the heap size with a small initial heap size. The opposite situation is not suitable if multiple Java applications are installed on a physical server, and these two parameters of the JVM should be different. Each JVM dynamically adjusts its heap size to maximize the utilization of physical machine memory.

The size of the - Xms - Xmx parameter determines the GC interval and Pause Time. If the heap size is too small, the GC interval time and Pause Time will also be small; If the heap size is too large, the GC interval time is large and the Pause Time is also large. Try to find a balance point in specific situations.