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When we set the values of Xms and Xmx to be equal, what is the impact on the FullGC, or allocation for young/ tenured gen in HotSpot.
Does it make any difference in JRockit?
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if the value of -Xms and -Xmx is same JVM will not have to adjust the heap size and that means less work by JVM and more time to your application.
Elasticsearch will assign the entire heap specified in jvm. options via the Xms (minimum heap size) and Xmx (maximum heap size) settings. You should set these two settings to equal each other.
The flag Xmx specifies the maximum memory allocation pool for a Java virtual machine (JVM), while Xms specifies the initial memory allocation pool. The Xms flag has no default value, and Xmx typically has a default value of 256 MB. A common use for these flags is when you encounter a java.
Solution 1: Initial heap size set to a larger value than the maximum heap size. We are getting this error because Xms(minimum heap size) is greater than Xmx(maximum heap size). Xms should always be lesser than Xmx to run java program correctly.
Setting these two parameters to the same value is a best practice. It will prevent the JVM from resizing the heap. The main effect is that all the other parts of the heap, especially the generations, do not change due to heap resizing. This allows to much better understand and configure the heap. It also removes pauses caused by resizing the heap. The only secnario where one would not do it is a client java application, which competes with many other applications over available memory. In todays use cases, you often can assign a fixed chunk of memory to java (in all server apps for example)
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