是否有关于GC问题的食谱指南？ [英] Is there a cookbook guide for GC problems?

问题描述

几乎每个人都会遇到Java的GC问题。

是否有一本食谱指南或半自动工具来调整GC for Java？

我的理由是这样的：

• 几乎任何人最终都会遇到这些问题


• 有很多可能的因素（比如20），其中只有少数会影响您的问题。
大多数人不知道如何识别关键因素，因此GC调优更为重要像黑色艺术而不是科学。不是每个人都使用HotSpot虚拟机。不同的Sun版本具有不同的GC特性。

• 没有什么动机去尝试（像每天运行虚拟机时略有不同的设置以查看它们如何播放）。 $ b

所以问题真的是：有没有什么我可以以检查列表的方式使用？或者甚至可能是一个分析GC日志或堆转储的工具，并给我特定的提示去哪里看（而不是告诉我95％的数据分配在byte []类型的对象中，这基本上是无用的）。 p>

相关问题：

• 适当的Tomcat 5.5启动参数来调整JVM的极端高需求，大堆Web应用程序？，这是非常具体的。我的问题更为广泛。


• 什么是最好的垃圾收集设置为客户端？再次非常狭窄的范围


• 仅限HotSpot


• JVM内存管理&垃圾收集书？在那里是80％，但我错过了清单/食谱/傻瓜法。 >解决方案

各种GC信息的参考：

Oracle

使用5.0 Java调优垃圾收集[tm]虚拟机

这也是

Java SE 6 HotSpot [tm]虚拟机垃圾收集调优

IBM

微调垃圾收集 [链接已死]

可扩展详细工具包
$ b SAP JVM

内存管理（垃圾收集）

检测内存泄漏

检测挂起/循环虚拟机

分析内存不足的情况

对不起，我对SAP不太了解，提供了一些我已经找到的东西。

至于烹饪书籍，调整在这个级别上最有可能是特定应用程序，但它是一个有趣的话题。

附加

您还提到了分析工具。这里列出了一些候选人：

了解任何Java垃圾收集日志分析工具？

Almost everyone eventually runs into GC issues with Java.

Is there a cookbook guide or semi-automated tool to tune GC for Java?

My rationale is this:

• Almost anyone eventually has these problems
• There are many possible factors (say 20) out of which only a few affect your problem.
• Most people don't know how to identify the key factors so GC tuning is more like a black art than a science.
• Not everyone uses a HotSpot VM. Different Sun versions have different GC characteristics.
• There is little incentive to experiment (like run the VM with slightly different settings every day to see how they play out).

So the question really is: Is there something that I can use in a check-list manner? Or maybe even a tool that analyzes GC logs or heap dumps and gives me specific hints where to look (instead of telling me "95% of the data is allocated in objects of the type byte[]" which is basically useless).

Related questions:

• Appropriate Tomcat 5.5 start-up parameters to tune JVM for extremely high demand, large heap web application? which is very specific. My question is more wide.
• What are the best garbage collection settings for client side? Again very narrow scope
• Does anyone know of a good guide to configure GC in Java? HotSpot only
• JVM memory management & garbage collection book? is 80% there but I'm missing the checklist/cookbook/for-dummies approach.

解决方案

References for various GC information:

Oracle

Tuning Garbage Collection with the 5.0 Java[tm] Virtual Machine

and this also

Java SE 6 HotSpot[tm] Virtual Machine Garbage Collection Tuning

IBM

Fine Tuning Garbage Collection [link dead]

Extensible Verbose Toolkit

SAP JVM

Memory Management (Garbage Collection)

Detecting Memory Leaks

Detecting Hanging / Looping VMs

Analyzing Out-of-Memory Situations

Sorry I don't know much about SAP but have provided some things I have found.

As for a cookbook, tuning is most likely application specific at this level, but it is an interesting topic.

ADDENDUM

You also mentioned analysis tools. Some candidates are listed here:

Know of any Java garbage collection log analysis tools?

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