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Xmx java8/31/2023 Some specialized JVM implementations may have customized garbage collection algorithms that do better with large heaps. On robust hardware, you may get better results running multiple JVMs, rather than just one with a large memory heap. As a practical matter, this can become a serious problem for heap sizes that exceed about two gigabytes, even if far more physical memory is available. This can mean minor, random pauses or, in extreme cases, "freeze the world" pauses of a minute or more. The larger the heap the longer it takes to do garbage collection. As long as the maximum is big enough, your app will run without error, but it may run more slowly if forced garbage collection kicks in frequently. Only if all garbage collection attempts fail will your application see an exception. Before an error is raised, the JVM will first try to reclaim any available space that already exists in the heap. It doesn’t always cause an error when the heap reaches the maximum size. Setting this limit too low can cause spurious errors in your application, but setting it too high can be detrimental as well. If the memory heap grows to this size, object creation may begin to fail and throw OutOfMemoryException. The maximum heap size, set with -Xmx, is more critical. Setting the initial heap size higher than the default may avoid a series of heap expansions, which often results in objects being shuffled around within the heap, as the application spins up. The only downside is a somewhat slower startup time since the application will take longer to initialize. It’s quite reasonable to not specify an initial size and let the heap grow as needed. If your Solr application requires more heap space than you specify with the -Xms option, the heap will grow automatically. These are -Xms, which sets the initial size of the JVM’s memory heap, and -Xmx, which sets the maximum size to which the heap is allowed to grow. There are two primary command-line options that set memory limits for the JVM. The most important JVM configuration settings are those that determine the amount of memory it is allowed to allocate. The following sections contain a few tips that may be helpful when the defaults are not optimal for your situation.įor more general information about improving Solr performance, see. Luckily, most modern JVMs are quite good at making the best use of available resources with default settings. Optimizing the JVM can be a key factor in getting the most from your Solr installation.Ĭonfiguring your JVM can be a complex topic and a full discussion is beyond the scope of this document. How to Contribute to Solr Documentation.
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