I am getting the error SEVERE: java.lang.OutOfMemoryError: Java heap space for my OpenShift application. As the error suggests I need to increase the java heap space. I have tried ssh'ing into my open-shift server and executed set JAVA_OPTS=-Xms1024M -Xmx1024M. Although the error is still present.
I am deploying a .war file on a tomcat7 server.
What should I be doing instead to fix this problem?
What size gear are yo using? If it is the small gear on the free account you only get 512MB of memory to begin with. If you need more memory you will need to upgrade to a larger gear, see http://www.openshift.com/pricing for how much memory the larger gear sizes have.
First, you need to check the heap size of the existing java process
Second, you need to try and increase it using the JAVA_OPTS option or otherwise. After making the change, check the process to validate that it indeed increased the heap size
Finally, if bumping the heap does not help, then as suggested you will need to perform some level of profiling or use some other technique to troubleshoot.
Related
I am facing an issue while deploying a particular application onto the Linux server running Ubuntu 16.04.
The application is written in Java, and performs a lot of I/O operation. In due course of time, while running the application, the cache consumption will increases. Although the output of free -h will show sufficient amount of available memory, but the application will crash by throwing the exception Java Heap Memory Out of Space Exception.
To work around the problem, I execute the clear cache command to free up the cache.
I need some guidance on whether the issue is caused by the cache, or something is wrong while running the application, as clearing the cache won't let the exception happen. Do Cache take away JVM memory?
Linux will always free the cache as needed, you should never have to do this explicitly.
the application will crash by throwing the exception Java Heap Memory Out of Space Exception
This means there isn't enough swap space to allocate memory to the JVM's heap.
I would either
increase the swap space
decrease the heap size.
pretouch all the spaces to ensure they are allocated eagerly.
I've been having trouble with my webapp. My heap memory peak up to nearly to max size for about 30 mins and the it crashes my system.
I have googled and tried nearly everything. I have been monitoring my heap memory using Java VisualVM, jconsole and Oracle Java Mission Control(I know it's outdated).
So what I have tried until know:
Monitored heap memory to see if there is a specific thread running at specific time and it peak the memory. (This is not the case as it doesn't specifically peak at specific times.)
2.Increased my heap memory size.
Followed instructions from:
http://karunsubramanian.com/websphere/top-4-java-heap-related-issues-and-how-to-fix-them/
So my questions are:
Is there any tool that can help me see if I have a memory leak and from where?
Has anyone experienced the same issue.
Any pointers on how to manage this kind of problems.
Btw I am quite new in this area so please be kind.
Tomcat 7 on Windows Server 2012
JAVA 7
If you need more information please comment.
You need to configure the jvm to create a heapdump when an outofmemory occurs.
-XX:+HeapDumpOnOutOfMemoryError
Then analyze the heap dump to find what classes are using the memory
I have a memory leak on my nodejs application. In order to resume the purpose of the application, it's an api called by an iOS application and a backoffice to administrate some content.
The application is in production and we experience some memory leak due to utilisation.
The memory on the server is always going up and never going down.
I try to analyze the problem using node-heapdump.
First of all, i see a big difference between the heap size of the snapshot given by node-heapdump and the size taken by the app in the memory (heap size ~ 30Mb and RAM size ~ 100Mb), where that difference came from ?
Then i see an increment of the heap size just by refreshing a home page who does not return anything.
Is anyone has an idea of where my problem could be ?
For information i use nodejs version 0.10.x and expressjs 4.0.0
Thanks in advance guys.
EDIT
I install memwatch-next and the leak event is raised.
The error i have is this one :
warning: possible EventEmitter memory leak detected. 11 leak listeners
added. Use emitter.setMaxListeners() to increase limit.
I try to set the defaultMaxListeners but when i stress the application the leak event is raised after sometime.
Does anyone knows what that error means ?
have a look at memwatch-next
I had similar issues with the memwatch package and switched to memwatch-next and it installed without the node-gyp error and produced worked. As for the difference between the RSS and the heapdump , I am in the same boat as you are.
Try to find memory leakage leak and stat from https://www.npmjs.com/package/memwatch.
Hope it would help.
I think you need this tool: easy-monitor
Might I recommend you try running the application with the --inspect argument, this will then allow you to attach Chrome dev tools and take memory snapshots. From here take one at startup one during testing and then one after you have finished testing the application (no more requests to the application but must still be running.) This will allow you to see what exactly is causing the growth in memory.
From here you will be able to see what is causing the growth and hopefully an indication as to where the leak is.
my application is running on jboss 6.1, and after few days my applications runs very slow., this is the situation I am facing every week,. for this I am killing java and clearing the temp and work folders and restarting the jboss again. Is there any other ways to clean the memory / manage the application. Kindly give me the suggestions for Linux and windows platforms.
Kindly help any one.
Thanks & Regards,
Sharath
Based on your RAM size of the system you can increase following parameters in run.conf(for linux) or run.conf.bat(for windows):
XMS, XMX, MaxPermSize.
-Xms512M -Xmx1024M -XX:MaxPermSize=128M
The flag Xmx specifies the maximum memory allocation pool for a Java Virtual Machine (JVM), while Xms specifies the initial memory allocation pool.
MaxPermSize are used to set size for Permanent Generation
The Permanent Generation is where class files are kept. These are the result of compiled classes and jsp pages. If this space is full, it triggers a Full Garbage Collection. If the Full Garbage Collection cannot clean out old unreferenced classes and there is no room left to expand the Permanent Space, an Out‐of‐ Memory error (OOME) is thrown and the JVM will crash
Hope you are aware of these three flags.
I am using weblogic 10.3.6 with JRockit installed . I am using a 64 bit system with Linux as OS. I have an adf application installed in it . There are only a couple of users using the application . But the server machine where WLS is installed keeps going down every week causing out of memory . so we have to restart it every week. When i was looking through I found that WebLogic can be made more stable by adjusting the heap size and other memory arguments .
Example: --Xms256m --Xmx512m MaxPermsize as 128m
My question is
What are these arguments ?
How are these arguments related to one another?
How do I determine the value for these arguments?
What can be other causes for out of memory issue?
Thanks,
Rakesh
Xms and Xmx are the minimum and the maximum heap (essentially where the objects are stored) size the java program can use.
In your case the java program is the WebLogic server on which your application is deployed. By default the Xms and Xmx values set by WebLogic server are : 256m and 512m.
Looks like your application needs more than 512MB heap memory. So you need to increase the maximum heap size (Xmx) to avoid frequent OutOfMemory error.
The new value of Xmx can be 1024m or more. You (or Performance team, if there is one.) have to do rigorous Performance, Scalability, Reliability testing with your application and with different Xmx values to determine what is the best for the application.
Setting the Memory Arguments (i.e Xms, Xmx) can be done at the script level (if you are using startWebLogic.sh/startManagedWebLogic.sh scripts to start the servers).
Script Level Changes:
Open setDomainEnv.sh and search for 'IF USER_MEM_ARGS the environment variable is set' and in the next line insert USER_MEM_ARGS="-Xms256m -Xmx1024m"
You can even change this setting from server to server by using SERVER_NAME variable which holds the server that is being started. For example to have this setting only for non-Admin servers, insert [ "${SERVER_NAME}" != "AdminServer" ] && USER_MEM_ARGS="-Xms256m -Xmx1024m"
Console Changes (Only if you use Admin Console to start the managed servers):
Login to AdminConsole–>Environments—>Servers—>—>Configuration—>ServerStart—>Arguments:(TextArea).
Enter : -Xms256m -Xmx1024m and Save.
Oh, btw JRockit does not have any concept of PermSize.
Get basic knowledge of the JVM parameters.
Simply setting a couple of JVM memory parameters to higher values won't help but only move the error into the future. You have to analyze the application to find out the real problem. JRockit comes with a very good memory analyzing tool Mission Control. Watch the demo, which will help to find out which part of your application causes the Out Of Memory error.