问题描述
我找不到与G1的运作方式有关的任何选项.以下两个命令不再适用于Java7.
I can't find any options relating to how G1 operates. The below two commands no longer work with java7.
-XX:+G1ParallelRSetUpdatingEnabled
-XX:+G1ParallelRSetScanningEnabled
推荐答案
我知道只有对G1有影响的选项:
Only options I am aware of that have an impact on G1 are:
-
激活:
to activate:
-XX:+UnlockExperimentalVMOptions -XX:+UseG1GC
设置G1尝试达到的最大GC暂停时间目标(以毫秒为单位):
to set the max GC pause time goal in milliseconds that G1 will attempt to meet:
-XX:MaxGCPauseMillis=<X>
设置GC暂停的时间间隔，总计可能达到MaxGCPauseMillis:
to set the time interval over which GC pauses totaling up to MaxGCPauseMillis may take place:
-XX:GCPauseIntervalMillis=<X>
设置年轻一代的人数以影响疏散暂停时间:
to set the size of the young generationto impact evacuation pause times:
-XX:+G1YoungGenSize=512m (在某些版本中也被禁用)
设置幸存者空间的大小(不只限于G1)
to set the (not specific to G1 only) survivor spaces' size
-XX:SurvivorRatio=6 (以及其他与幸存者有关的选项)
请注意，所有-XX选项类型均被视为实验性的，随时可能更改(因此，通常不是您想要粘贴在用于快速启动您的.{bat,sh}，wrapper.conf脚本或配置文件的内容)企业应用程序.
Be warned that all -XX options types are deemed experimental and subject to change at any time (so, usually not stuff you want to stick in the .{bat,sh}, wrapper.conf script or config file used to jump-start your enterprise application.
它们非常有用，但是如果您想要稳定且耐用的发射器，则不要过分依赖
They are pretty useful, but not to rely on too much if you want a stable and durable launcher.
您提到的2个选项虽然在Java SE 6 Updates的G1首次公开发布时最初可用，但现在已被弃用.在某些版本中，G1YoungGenSize也是如此.
The 2 options you mentioned, while originally available at the time of G1's first public release in the course of Java SE 6 Updates, have now been deprecated. So has G1YoungGenSize in some versions.
来源:
- Java SE 6 Update 14 Release Notes
- G1 Garbage First Collector Introduction
- Java HotSpot VM Options
- Plus a presentation on JVM Tuning
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