java - -Xms : Initial heap size or minimum heap size?

Question

-Xms是指定初始堆大小还是最小堆大小？我看到不同的观点。有些人喜欢 second answer here ，说它用于初始堆，而其他一些人说它是最小堆大小。

还是说最小尺寸本身就是初始尺寸？

Answer 1

初始堆大小是最小堆大小。它不会小于初始堆大小。

来自 Tuning Garbage Collection with the 5.0 Java[tm] Virtual Machine :

By 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. 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 .