当服务器 VM 是默认选项时，为什么存在 -server 选项?

问题描述

java 命令的帮助菜单显示-server 选项是选择服务器"VM.它还指出服务器"是默认选项.为什么这么多余?

The help menu for java command says that -server option is to select the "server" VM. It also states that 'server' is the default option. Why so redundant?

如果有任何帮助，java -version"会产生:

If it is of any help, "java -version" yields:

java version "1.8.0_191"
Java(TM) SE Runtime Environment (buil 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)

推荐答案

-client 和 -server 在现代 JVM 上被 忽略，因为就这么简单.JITcompilers有两个C1和C2，但是有5个tiers，整个荣耀里的所有细节都是这里在评论中.

-client and -server are ignored on modern JVMs, as easy as that. There are two JITcompilers C1 and C2, but there are 5 tiers, all the details in the entire glory are here in the comments.

这些标志用于控制 C1 和 C2 的行为方式 - 禁用与否；这现在由另外两个标志控制:XX:-TieredCompilation -XX:TieredStopAtLevel=1

These flags used to control how C1 and C2 would act - disable or not; this is now controlled by two other flags : XX:-TieredCompilation -XX:TieredStopAtLevel=1

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