将Xms和Xmx设置为相同的值有什么好处? [英] Is there any advantage in setting Xms and Xmx to the same value?

问题描述

通常，我设置-Xms512m和-Xmx1g，以便在JVM启动时分配512MB，并根据需要将堆逐渐增加到1GB.但是在专用服务器实例中，我看到这些值设置为相同的1g.将两者设置为相同的值有什么好处吗?

Usually I set -Xms512m and -Xmx1g so that when JVM starts it allocates 512MB and gradually increases heap to 1GB as necessary. But I see these values set to same say 1g in a dedicated server instance. Is there any advantage for the having both set to the same value?

推荐答案

好几件事.

1. 程序将以-Xms值开头，如果该值较小，则最终将迫使GC发生频率更高
2. 一旦程序到达-Xms堆，jvm请求操作系统提供更多内存，并最终获取-Xmx，这需要花费更多时间导致性能问题，因此您最好在开始时将其设置为-Xmx，从而避免jvm请求额外的内存. /li>

1. Program will start with -Xms value and if the value is lesser it will eventually force GC to occur more frequently
2. Once the program reaches -Xms heap, jvm request OS for additional memory and eventually grabs -Xmx that requires additional time leading to performance issue, you might as well set it to that at the beginning avoiding jvm to request additional memory.

这里的答案非常好- https://developer.jboss.org/thread /149559?_sscc = t

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