当服务器VM为默认选项时，为什么-server选项在那里? [英] Why is -server option there when server VM is the default option?

问题描述

java命令的帮助菜单显示，-server选项用于选择服务器" 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?

如果有帮助，则"java -version"将产生:

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，就这么简单. JIT 编译器 C1和C2有两个，但是有5个 tiers ，整个荣耀中的所有细节都是

-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-禁用或不禁用；现在，这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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