jvm.cfg文件与Java相关的目的是什么？ [英] What is the purpose of jvm.cfg file in relation to Java?

问题描述

它有一些奇怪的关键字。

解决方案

短版本：

长版本：

控制可以在调用java或javac时使用启动标志选择的JVM。 >让我们从注释开始

 ＃可以用作java，javac等选项的JVM列表
＃顺序很重要 - 这个列表中的第一个是默认的JVM。 
＃注意，这个文件和它的格式是UNSUPPORTED和
＃WILL GO AWAY在未来的版本。 
  

所以我们有一个'JVM'传递给java / javac的列表。我们需要澄清在这个文件的上下文中JVM是什么。

让我们看一个简单的行：

  -green错误
  

和实验

  java -green> / dev / null 
错误：绿色虚拟机不支持
  

表示不支持的配置。

让我们继续到

  -classic WARN 
  

并执行

  java -classic> / dev / null 
警告：不支持经典VM;客户端VM将被使用
  

似乎WARN会将我们发送到默认的JVM

 
 code> -client IF_SERVER_CLASS -server 
  

这似乎表示默认是服务器

下一个是

  -server KNOWN 
  

这意味着服务器JVM是已知的。 p>

最后

  -hotspot ALIASED_TO -client 
  

表示热点等同于客户端。

It has some strange keywords. Please explain the general purpose of the file.

解决方案

Short version:

Controls the JVMs which may be picked with startup flags when invoking java or javac.

Long version:

Let's start with the comments

# List of JVMs that can be used as an option to java, javac, etc.
# Order is important -- first in this list is the default JVM.
# NOTE that this both this file and its format are UNSUPPORTED and
# WILL GO AWAY in a future release.

So we have a list of 'JVM's to pass to java/javac. We need to clarify what a JVM is in the context of this file.

Let's take one simple line:

-green ERROR

and experiment

java -green > /dev/null
Error: green VM not supported

So it seems that the ERROR flag signals an unsupported configuration.

Let's move on to

-classic WARN

and execute

java -classic > /dev/null
Warning: classic VM not supported; client VM will be used

Seems that 'WARN' will send us to the default JVM which seems to be 'client' for us.

Then we can take a look at the first line

-client IF_SERVER_CLASS -server

which seems to signal that the default is server unless the machine is a server-class.

The next one is

-server KNOWN

which means that the server JVM is known.

And finally

-hotspot ALIASED_TO -client

means that hotspot is equivalent to client.

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