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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
  • What does Java option -Xmx stand for? - Stack Overflow
    The -Xmx option changes the maximum Heap Space for the VM java -Xmx1024m means that the VM can allocate a maximum of 1024 MB In layman terms this means that the application can use a maximum of 1024MB of memory
  • Difference between Xms and Xmx and XX:MaxPermSize
    -Xmxsize Specifies the maximum heap size -XX:MaxPermSize=size Sets the maximum permanent generation space size This option was deprecated in JDK 8, and superseded by the -XX:MaxMetaspaceSize option Sizes are expressed in bytes Append the letter k or K to indicate kilobytes, m or M to indicate megabytes, g or G to indicate gigabytes References:
  • Speed tradeoff of Javas -Xms and -Xmx options - Stack Overflow
    Whether my Xms and Xmx value should be same - Most websites and even oracle docs suggest it to be the same However, I suggest to have some 10-20% of buffer between those values to give heap resizing an option to your application in case sudden high traffic spikes OR a incidental memory leak
  • What is the default max heap size (-Xmx) in Java 8?
    Also Java configuration options (command line parameters) can be "outsourced" to environment variables including the -Xmx, which can change the default (meaning specify a new default) Specifically the JAVA_TOOL_OPTIONS environment variable is checked by all Java tools and used if exists (more details here and here )
  • java - Is there a maximum number you can set Xmx to when trying to . . .
    If I understood correctly, you set the -Xmx on Eclipse launcher If you want to increase the memory for the program you run from Eclipse, you should define -Xmx in the "Run->Run configurations "(select your class and open the Arguments tab put it in the VM arguments area) menu, and NOT on Eclipse startup Edit: details you asked for in
  • Java app that uses a lot of memory. Use -Xmx? - Stack Overflow
    If you are running it with -Xmx15G jvm param and it is taking that much of memory then it doesn't mean that it actually requires 15G memory space More memory means GC will run very few times and it will allow the app to use more memory So try to run it with setting -Xmx to a low value and then check whether you are getting the OutOfMemory
  • Is there any advantage in setting Xms and Xmx to the same value?
    This target range is set as a percentage by the parameters -XX:MinHeapFreeRatio=<minimum> and -XX:MaxHeapFreeRatio=<maximum>, and the total size is bounded below by -Xms<min> and above by -Xmx<max> Setting -Xms and -Xmx to the same value increases predictability by removing the most important sizing decision from the virtual machine However
  • java - JVM heap parameters - Stack Overflow
    -Xms and -Xmx simply specifies the range in which the JVM can operate and resize the heap If -Xms and -Xmx are the same value, then the JVM's heap size will stay constant at that value It's typically best to just set -Xmx and let the JVM find the best heap size, unless there's a specific reason why you need to give the JVM a big heap at JVM
  • How to set Java heap size (Xms Xmx) inside Docker container?
    Update: Regarding this discussion, Java has upped there game regarding container support Nowadays (or since JVM version 10 to be more exact), the JVM is smart enough to figure out whether it is running in a container, and if yes, how much memory it is limited to





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