I have written some piece of code for my program in Matlab 7.10.0 which has a graphical user interface, but sometimes i do receive this error on the command window:
[ConditionalEventPump] Exception
occurred during event dispatching:
java.lang.OutOfMemoryError: Java heap
space
And the system gets too slow...
Kindly help me with this,,how can i resolve this heap memory issue.
You need to increase the amount of heap memory for the JVM, see this "solution"
Go to Preferences -> General -> Java Heap Memory and increase the heap size. Restart MATLAB and check if it works (if not, maybe you could consider increasing a bit more).
Related
Since I was introduced to the concept of heap of a process, I have been assuming that the OS allocates it at the creation of the process. But then I was doing some research and read a statement here.
It says:
When a program asks malloc for space, malloc asks sbrk to increment the heap size and returns a pointer to the start
of the new region on the heap.
If I understood what's been said, the OS allocates 0 cell for the process's heap, and it is only by calling malloc that the process gets some heap cells. And for me this makes more sens for the expression "dynamic allocation". Is this correct ?
in figure you can see that your c/c++ program have a free memory area where the heap and the stack can grow until full the region, so Initialy the heap is empty, and when a process call malloc, Normally (but in modern implementation, malloc prefer to call always mmap()) he call the sbrk() function for increase the memory size of the heap (in reality he first search into the free linked list and if there is not any entry into the linked list he call sbrk(), see this for a implementation of malloc() malloc implementation?).
So the os don't directly decide how the heap of a process should be allocated, in c/c++ the thinks work like this, but i think that in other languages the thinks can be slightly different.
I have got two huge matrices dat1=87093*59 and dat2=99802*59. I tried to do following operation R=dat1*dat1' but MATLAB throws me an error
??? Out of memory. Type HELP MEMORY for your options.
I have increased Java Heap Memory to 2012Mb but still the problem repeats. Can anyone help me out.
system config: windows 7-64bit, 8gb ram, MATLAB:r2010a-32bit version
Given dat1 is 87093x59, by doing R=dat1*dat1', the output would be 87093x87093. Say you really meant dat1*dat2', it's even worse, 87093x99802.
Assuming dat1 is double precision (8 bytes per element), dat1*dat1' is 60,681,525,192 bytes (about 60GB). With dat1*dat2' it's close to 69 GB. I'd say give up or re-evaluate your approach.
Try using jconsole or jvisualvm which are bundled in the bin folder of your JDK. Then view your running java process. It could be that your PermGen is the culprit here OR possibly a memory leak, in which case you can dump the memory via these tools and use a heap analysis tool to find out what might be causing the extreme memory usage.
I am facing memory issue in eclipse. Initially I was getting this error: ‘Unhandled event loop exception java heap space’ and also sometimes ‘An out of memory error has occured’.
I somehow managed to increase my heap size upto -Xmx990m. But still its not working. When I try to increase heap size beyond that, I am getting error ‘Unable to create virtual machine’ while starting eclipse.
I tried to make other changes in eclipse.ini file. When I change XXMaxPermSize, it gives me ‘permGen memory error’. For few times, I got different other kind of errors like ‘Unhandled event loop exception GC overhead limit exceeded’ and 2-3 more different types. Please help me what can be done that would be great!
Jeshurun's somewhat flippant comment about buying more RAM is actually fairly accurate. Eclipse is a memory HOG! On my machine right now Eclipse is using 2.1GB; no joke. If you want to be able to use Eclipse really effectively, with all the great features, you really need lots of memory.
That being said, there are ways to use Eclipse with less memory. The biggest helper I've found is disabling ALL validators (check "Suspend all validators" under Window>Preferences>Validation; just disabling the individual ones doesn't help enough). Another common source of memory-suckage is plugins. If you're going to stay at your current memory limit, I strongly recommend that you:
Uninstall your current Eclipse
Download the core/standalone/just Java version of Eclipse (the one with least filesize/no plug-ins built-in)
Try using just that for awhile, and see how the performance is. If it's ok, try installing the plug-ins you like, one at a time. Never install multiple, and give each one a week or two of trial.
You'll likely find that some plug-ins dramatically increase memory usage; don't use those (or if you do, get more RAM).
Hope that helps.
I also faced the same problem.I resolved by doing the build by following steps as.
-->Right click on the project select RunAs ->Run configurations
Select your project as BaseDirectory.
In place of goals give eclipse:eclipse install
-->In the second tab give -Xmx1024m as VM arguments.
I faced similar situation. My program had to run simulation for 10000 trials.
I tried -Xmx1024m : still it crashed.
Then I realized given my program had too much to put up on console; my console-display memory may be going OOB.
Simple solution=> right-click console > preferences > Check Limit console output > Enter Buffer size(characters)[Default: 80000].
I had unchecked it for analyzing single run, but when the final run had 10000 trials, it started to crash passed 500 trials.
Today was the day: I thought three times, that how programming in Java helps me skip the whole job memory deallocation and cursed C for the same. And here I am, spent last 2 1/2 hours to find how to force GC, how to dellocate variable( By the way, none was required).
Have a good day!
I'm getting the java.lang.OutOfMemoryError exception in Eclipse. I know that Eclipse
by default uses heap size of 256M. I'm trying to increase it but nothing happens.
For example:
eclipse -vmargs -Xmx16g -XX:PermSize=2g -XX:MaxPermSize=2g
I also tried different settings, using only the -Xmx option, using different cases
of g, G, m, M, different memory sizes, but nothing helps. Tried also to specify the values in the eclipse.ini file. Does not matter which params I specify, the heap exception is thrown at the same time, so I assume there's something I'm doing wrong that Eclipse ignores the -Xmx parameter. I'm using a 32GB RAM machine and trying to execute something very simple such as:
double[][] a = new double[15000][15000];
It only works when I reduce the array size to something around 10000 on 10000.
I'm working on Linux and using the top command I can see how much memory the Java
process is consuming; it's less than 2%.
Thanks!
Okay, I found a solution after reading
Why does heap space run out only when running JUnit tests?
When I specify the -Xmx inside eclipse by going to run->configuration->vm arguments
and set the -Xmx there, everything works fine :)
JBoss crashed with out of memory error, how do I prevent this? I modified the values in run.bat but result is same.
"- Xms1024 Xmx1024 PermGen512"
You might have a resource leak, in which case anything but finding and removing the leak will only delay the error, not prevent it. jhat & -XX:+HeapDumpOnOutOfMemoryError will let you inspect the objects in your heap at the time of the OOM, which is a decent start to figuring out if you have a leak & where your leak is.
As for run.bat, the options you list may not be working the way you intend. I would be sure to specify the "m"egabyte (kilobyte? gigabyte? mb seemed most likely here) suffix explicitly, and to set the max size before the initial size. So, -Xmx1024m -Xms1024m -XX:MaxPermSize=512M.
512 megabytes, btw, is a big size for a permanent generation. Maybe you meant kb?. You can either use jstat or add -XX:-PrintGCDetails to your run.bat to see how much permanent generation space is actually being used.
Your problem might be related to the problem explained here: JVM: Solving OutOfMemoryError with less Memory
In Jboss Version:Version: 5.0.0.GA, while running the application in jboss I have faced the out of memory error because of large data processing from application.
To resolve the same either you can optimize the code so that while processing there will be less data in heap memory or you can increase the heap memory of JBOSS:
JAVA_OPTS="-Xmx4096m -Xms4096m -XX:MaxNewSize=896m -XX:NewSize=896m
You can change the memory values as per your requirement.
If out Of memory error is coming with permgen space issue, then you can restart the server to resolve the same and you can restrict the same by changing the the memory value for the below mentioned variable:
-XX:MaxPermSize=256m
Thanks,
Ankit Adlakha
Might be related to this.
https://issues.jboss.org/browse/JBAS-7553
Apparently, when running as a service, JBoss might ignore -Xms