Doodlejump platform generation java10/6/2023 The calculation used in Java SE for the parallel collector and the server JVM are now used for all the garbage collectors. Similarly, if the free space exceeds 70%, then the generation will be contracted so that only 70% of the space is free, subject to the minimum size of the generation.Īs noted in Table 4-1, "Default Parameters for 64-Bit Solaris Operating System", the default maximum heap size is a value that is calculated by the JVM. With these parameters, if the percent of free space in a generation falls below 40%, then the generation will be expanded to maintain 40% free space, up to the maximum allowed size of the generation. Table 4-1 Default Parameters for 64-Bit Solaris Operating System Parameter The default parameters for the 64-bit Solaris operating system (SPARC Platform Edition) are shown in Table 4-1, "Default Parameters for 64-Bit Solaris Operating System": This target range is set as a percentage by the parameters -XX:MinHeapFreeRatio= and -XX:MaxHeapFreeRatio=, and the total size is bounded below by -Xms and above by -Xmx. Because collections occur when generations fill up, throughput is inversely proportional to the amount of memory available.īy default, the virtual machine grows or shrinks the heap at each collection to try to keep the proportion of free space to live objects at each collection within a specific range. The most important factor affecting garbage collection performance is total available memory. (See the section Parallel Collector Ergonomics in Sizing the Generations for details on heap resizing and default heap sizes with the parallel collector.) However, the parameters that control the total size of the heap and the sizes of the generations do apply to the parallel collector. The following discussion regarding growing and shrinking of the heap and default heap sizes does not apply to the parallel collector.
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