Jmeter java.lang.OutOfMemoryError：超出GC开销限制

问题描述

我使用Jmeter将工作负载注入部署在AWS EC2实例上的应用程序。测试必须非常巨大：持续10个小时，工作负载配置文件具有双峰形状，5分钟内请求约2600个请求。实际上，我有一个m3.xlarge实例，其中部署了应用程序，并且每个运行jmeter实例的m3.xlarge实例有8个。使用python脚本，要注入的工作量将在8个客户端实例之间进行分配，例如，如果原始工作负载为800个请求，每个jmeter实例将注入100个请求。正如我所说的完整测试持续10个小时，并分为每个5分钟的时间步长。每5分钟应用一点工作量变化。实际上，我从每个jmeter实例获取java.lang.OutOfMemoryError：在测试开始后没有任何请求到达应用程序后，立即通过GC overhead overhead exceeded错误。我在网上阅读了很多东西，并且在stackoverflow上，我总结出可能的错误可能是：
$ b $ ul

JMV heap size too low>我解决了在每个jmeter实例的jmeter.bat文件中设置以下内容：

set HEAP = -Xms4g -Xmx4g

set NEW = -XX：NewSize = 4g -XX：MaxNewSize = 4g

代码中的一些错误会导致继续无用的垃圾收集器。所以我从我的测试中删除了所有jmeter听众。特别是我使用TableVisualizer，ViewResultsFullVisualizer，StatVisualizer和GraphVisualizer。

无论如何，问题仍然存在。我真的不知道如何解决它。我知道10个小时的测试2600音高要求可能是一个非常重的测试，但我认为应该有一种方法来执行此操作。我使用EC2 m3.xlarge实例，所以我甚至可以将堆大小提高到8G（如果它可能有用），或者将工作负载分散到更多客户端，因为我使用的是实例实例，所以我不会付出太多的代价，但因为我已经将客户端实例的数量从4个增加到8个，以便解决问题并且不起作用，所以我有点困惑，并且我希望在继续获得更多资源之前知道r建议。
提前感谢您。

解决方案

您的堆设置看起来不正确：
set HEAP = - Xms4g -Xmx4g
set NEW = -XX：NewSize = 4g -XX：MaxNewSize = 4g

您的新等于堆大小，这是错误的。

您可以执行ps -eaf | grep java并显示输出结果吗？

并检查你是否尊重这些建议：

I'm using Jmeter to inject workload to an application deployed on an AWS EC2 instance. The test has to be very huge: it lasts for 10 hours and the workload profile has a bimodal shapes with a pitch of about 2600 requests in 5 minutes. Actually I have one m3.xlarge instance in which the application is deployed and 8 m3.xlarge instances each one running a jmeter instance. With a python script the workload to inject is splitted among the 8 client instances so in example if the original workload as to inject 800 requests, each jmeter instance will inject 100 requests. The full test as I said lasts for 10 hours and is divided into timesteps of 5 min each. Every 5 min a little workload variation is applied. Actually I get from each jmeter instance the java.lang.OutOfMemoryError: GC overhead limit exceeded error immediatly after the test is started and no request arrive to the application. I read a lot online and on stackoverflow, and I concluded the possible mistake could be:

• JMV heap size too low-> I solved setting the following in the jmeter.bat files in each jmeter instance:

  set HEAP=-Xms4g -Xmx4g

  set NEW=-XX:NewSize=4g -XX:MaxNewSize=4g

• some mistakes in the code that results in a continue unuseful usage of the garbage collector. So I remove from my test all the jmeter listeners. In particular I was using TableVisualizer, ViewResultsFullVisualizer, StatVisualizer, and GraphVisualizer.

Anyway the problem persists. I really have no idea about how to solve it. I know 10 hours of test with 2600 pitch request could be a very heavy test, but I think there should be a way to perform this. I'm using EC2 m3.xlarge instance so I could even raise the heap size to 8G if it could be useful, or splitting the workload among even more clients since I'm using spot instances so I will not pay so much more, but since I have already doubled the number of client instance from 4 to 8 in order to solve the problem and is doesn't work I'm a little bit confused and I want to know r suggestions before continue to get more and more resources.Thank you a lot in advance.

解决方案

Your heap settings look wrong:set HEAP=-Xms4g -Xmx4gset NEW=-XX:NewSize=4g -XX:MaxNewSize=4g

Your new is equal to Heap size, this is wrong. Comment NEW part first.

Can you do a ps -eaf|grep java and show the output ?

And also check you respect these recommendations:

• http://jmeter.apache.org/usermanual/best-practices.html
• http://www.ubik-ingenierie.com/blog/jmeter_performance_tuning_tips/

Finally, show an overview of your Test plan and , number of threads that you start.

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