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What are the -Xms and -Xmx parameters when starting JVM? The flag Xmx specifies the maximum memory allocation pool for a Java Virtual Machine (JVM), while Xms specifies the initial memory allocation pool This means that your JVM will be started with Xms amount of memory and will be able to use a maximum of Xmx amount of memory For example, starting a JVM like below will start it with 256 MB of memory and will allow the process to use up to 2048 MB
java - JVM heap parameters - Stack Overflow Apart from standard Heap parameters -Xms and -Xmx it's also good to know -XX:PermSize and -XX:MaxPermSize, which is used to specify size of Perm Gen space because even though you could have space in other generation in heap you can run out of memory if your perm gen space gets full This link also has nice overview of some important JVM parameters
Speed tradeoff of Javas -Xms and -Xmx options - Stack Overflow The speed tradeoffs between various settings of -Xms and -Xmx depend on the application and system that you run your Java application on It also depends on your JVM and other garbage collection parameters you use
Increase heap size in Java - Stack Overflow The above parameters increase the InitialHeapSize (-Xms) to 4GB (4096 MB) and MaxHeapSize (-Xmx) to 6GB (6144 MB) But, the Young Generation Heap Size will remain same and the additional HeapSize will be added to the Old Generation Heap Size
What does the -Xms JVM mean in reference to heap memory? The Xms flag tells to your JVM the amount of memory for initial allocation If your program need more memory than the value specified in Xms the JVM will take more memory until the limit specified in Xmx
java - Why -Xms is required? - Stack Overflow The difference between -Xms and -Xmx apart from being minimum and maximum heap size ranges is that; -Xms amount of memory if available will be assigned immediately by OS to your application but -Xmx will be treated like a request taken and will be served as and when required upto that limit