问题描述
为什么在 -server 模式下运行的 Java 说版本是混合模式"?当我看到时，这是否意味着 JVM 并没有真正以纯服务器模式加载?
Why does Java , running in -server mode, say that the version is "mixed-mode" ? When I see that, does it mean that the JVM didn't truly load in pure server mode?
推荐答案
服务器模式并不意味着不混合".这些是不同的设置.
server mode does not mean "not mixed". Those are different settings.
混合确实意味着 JVM 将混合编译和解释代码.您可以选择使用开关 -Xint 切换到完全解释模式(通常您不想这样做).
Mixed does mean that the JVM will mix compiled and interpreted code. You could optionally switch to fully interpreted mode with the switch -Xint (usually you don't want to do this).
服务器模式意味着热点编译器将使用服务器设置运行.一般的假设是服务器模式下的虚拟机是长时间运行的，因此在进行优化时会考虑到这一点.
Server mode means that the hot-spot-compiler will run with server-settings. The general assumption is that VMs in server-mode are long-running, so optimizations will be done with this in mind.
因此，如果您看到混合模式，这并不表明您的 VM 未在服务器模式下运行.
So if you see mixed mode, that is no sign that your VM is not running in server-mode.
如果您想检查真正运行的内容，请尝试
If you want to check what is really running, try the output of
System.out.println(System.getProperty("java.vm.name"));
System.out.println(System.getProperty("java.vm.info"));
至少对于 Sun VM 或 OpenJDK，这会给您一个提示.您可能会注意到，如果您在 64 位系统上，您将始终运行服务器 VM.
At least for the Sun VM or OpenJDK this will give you a hint. You might notice that you'll always run the Server VM if you are on a 64 bit system.
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