I have Apache Tomcat installed on my Windows 7 Client machine, and am utilising geoserver.war as a deployment.
I keep on getting timed out/Java memory issues within Geoserver.
[(http://localhost:8080/geoserver/web/]
There are lots of examples on how to increase space under Linux but not under a Windows Client. I currently have 8GB of DDR5 memory and an Intel Core i5.
Any ideas on how I increase this on a Windows Client?
You can increase the JVM heap space by adding the following parameters, also it should work on Windows and Linux:
-Xmx2048m -> this param to set the max memory that the JVM can allocate
-Xms1024m -> the init memory that JVM will allocate on the start up
-XX:MaxPermSize=512M -> this for the max Permanent Generation memory
In order to add them under tomcat:
Navigate and open tomcat7w.exe inside [TOMCAT_HOME]/bin
Go to Java tap, then add them under Java Options
Related
What is maximum Heap size for Java process running on Windows 10 64 bits, with 64 bits JVM? My machine has 8 GB of RAM. And I am running Java 8.
I trying to run BFS on huge graph for experimental purposes. While running BFS I am monitoring Heap size being used in Java Visual VM. According to Visual VM heap utilization is always less than 2000 MB regardless of providing following JVM parameters
-Xms2048m
-Xmx3072m
-XX:ReservedCodeCacheSize=240m
-XX:+UseConcMarkSweepGC
-XX:SoftRefLRUPolicyMSPerMB=50
-ea
-Dsun.io.useCanonCaches=false
-Djava.net.preferIPv4Stack=true
-XX:+HeapDumpOnOutOfMemoryError
-XX:-OmitStackTraceInFastThrow
I did some research over internet but could not find any specific answer related to the system specification I am using. Can a java process use more than 2 GB on Windows 10 64 bit and 64 bit JVM? As Guidelines for Java Heap sizing the limit for Windows XP/2008/7 is 2 GB.
On a 64-bit machine, with 64-bit JVM you can work with multi gigabyte heaps (dozens and dozens of GBs). I'm not sure it's limited in any way except by the available memory (and the theoretical address space of a 64-bit pointer).
Of course if you're working with a huge heap, the GC has a lot more work to do and you may find that you need to scale horizontally instead of vertically, to maintain a good performance.
If VisualVM isn't showing you using more than 2GB (the initial heap size given with -Xms), then it probably just doesn't need more than that. You've given the permission to use up to 3GB (-Xmx), but the JVM won't allocate more memory just for the fun of it.
Maximum Heap can be allocated for 32bit JVM is 2^32 = 4G, Again 4gb will be devided into 1+ GB for VM to use for runtime classes. It varies windows it is ~2GB and linux it is ~3GB.
As you are using 64bit machine maximum heap available is 2^64 it will be big enough for you to run BFS easily.
You can monitor the available memory using vm flags "-XX+PrintFlagsFinal | grep -iE HeapSize" will tell you the maximum available heap size that can be used. Configure slightly less than that and start using...
There is no definite size you could specify for 64 bit architecture but simple test helps you find what is the maximum contiguous space available or could be allocated for a process. This could be tested as follow by using simple command.
Try as below
java -Xmx -version
If the above command gives result then your system could be allowed to have Xmx to that level, If it fails then you can't specify that value.
Few test from system.
I tested the value with 20G.40g,100G,160G,300G all these gave java -version output but tried with 1600G that throws the error.
Output of the test
C:\Users\mpalanis>java -Xmx300G -version
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)
C:\Users\mpalanis>java -Xmx1600G -version
Error occurred during initialization of VM
Unable to allocate 52431424KB bitmaps for parallel garbage collection for the requested 1677805568KB heap.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
Hope this explanation helps.
If you are using IntelliJ Idea as an IDE you can do this directly from it,
From the main menu, select Help | Change Memory Settings
Set the necessary amount of memory that you want to allocate and click Save and Restart.
This changes the value of the -Xmx option used by the JVM and restarts IntelliJ IDEA with the new setting.
I am running on 7 GM Ram machine , I have a heap dump file of size 1.8 GB . I am using Java 8 of 64 bit and running on 64 bit machine.
When i try to open the phd file from heap dump analyzer tool , it throws out of memory error. I am setting java vm args for heap analyzer tool as below
java -Xmx4g -XX:-UseGCOverheadLimit
but still i am unable to open file. Please let me know how can i overcome this.
This happens due to that the default heap size is smaller than needed by the dump size to be loaded, to resolve this, you need to set the VM args Xms, and XmX with the right values, below is what worked for me:
"<JAVA_PATH>\Java.exe" -Xms256m -Xmx6144m -jar <HEAP_ANALYSER_NAME>.jar
I hope that helps, I know it is a bit late response :)
I faced the same issue multiple times. I noticed that the analyzer runs better on Linux. On windows it needs a very large amount of memory most of the times - and surprisingly I did not see any apparent direct co-relation between the heapdump size and the required xmx size by the analyzer.
You can either try on Linux if that is an option, or increase the xmx size further.
I Installed JDK 1.8 along with JRE 1.8 and made the changes Java Runtime Environment Settings : java control panel --> Java --> View --> User (Run Time Parameters to -Xms256m -Xmx6144m) and enable both JRE and JDK 1.8 versions.
This works out finally :) ; give it a try, JDK1.8 64bit in Windows.
We're getting the java.lang.OutOfMemoryError: PermGen space in our environment:
Windows Server 2012 R2 64-bit 8GB RAM
JRE 1.7 u80
Tomcat 7.0.73
ActiveMQ 5.9.0
Mule runtime 3.5.4
Mule management console 3.5.3 deployed over Tomcat 7
webservice war file that uses PhantomJS 1.9.8 deployed over Tomcat 7
setenv.bat file under Tomcat/bin folder with below settings:
setenv JAVA_OPTS=-Xms512M -Xmx2048m -XX:PermSize=1024m -XX:MaxPermSize=1024m
Also, registry settings for JVM as under tomcat7w.exe:
initial memory pool: 256 MB
maximum memory pool: 1536 MB
Could any explain which takes precedence, setenv.bat file settings or tomcat7w.exe settings for memory pool?
Also, what should be the ideal settings for this environment as these settings are currently running on windows server 2008 R2 64-bit with 16GB RAM?
It depends how you start your Tomcat, whether you start it as windows service or via the catalina.bat.
You can check the following post: [question]: Configure Tomcat as a service (no catalina.bat)
As #GKGeorgiev says, it will depend on how you are launching Tomcat.
I suggest you do a little experiment:
Change the max heap size settings in setenv.bat to a value that is small enough to trigger an immediate failure.
Start Tomcat.
If this causes the behavior to change (e.g. to fail immediately) you know that the setenv.bat file is the one that is taking precedence. If not, then not.
Then do the experiment the other way around; i.e. change the equivalent registry setting and see if that has any effect.
Also, check the Tomcat documentation that applies to the launch method you are using.
Finally, it would be advisable to upgrade to Java 8. Java 7 is well beyond its EOL, and running a Java version that is not getting security patches is risky.
for ideal memory setting
Xms and Xmx should be equal ,
Inside catalina.bat JAVA_OPTS variable your should define the memory parameters.
while starting this will take the precedence.
take care
I'm running Tomcat 7 as a windows service in a Windows Server 2008 Machine. I've got a Java.lang.OutOfMemoryError: PermGen space so I'm trying to increase its PermGen memory heap. So I specify this line at the end of JVM options:
-XX:PermSize=512m -XX:MaxPermSize=512m -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled -XX:+HeapDumpOnOutOfMemoryError
As specified in the picture below:
The server is properly launched, however I cannot get the permgen size increased. When I enter Tomcat's management GUI, I can see the memory near the limit (the line at the end, PS Perm Gen):
So the application gets stuck after a while. Why is not Tomcat changing this value?
As of my experience you are allowed to put only one option per line.
I got "failed to create JVM" error when I tried to run a jnlp file.
But it works when I removed the max-heap-size="1100m" from Java/j2se tag in jnlp.
It seems something wrong with the max-heap-size. I did some experiments to change the heap size in eclipse.ini file. The biggest heap size I could set is "940M", otherwise I got "Could not create JVM..." error when start the eclipse.
I suspect this is a memory(hardware) problem on my PC. My laptop is pretty new. But for some reason, my admin change the OS from Windows 7 to Windows XP. They now want to change back to windows 7.
I am using JDK 1.6 update 29 and eclipse Version: 3.7.0 Build id: I20110613-1736. Windows xp sp3.
Java requires continuous memory for the heap space. Windows in particular tends to have a limited continuous region of memory available (which is smaller if other programs are running)
I would have thought you can have 1.2 GB heap, but this is far less than the 4 GB a 32-bit application can use in theory.
Switching to a 64-bit JVM on a 64-bit OS is the solution. This will allow you to create a heap space close to the physical memory size.