Increase heap size in Java

Question

I am working on a Windows 2003 server  64-bit  with 8 GB RAM  How can I increase the heap memory maximum  I am using the -Xmx1500m flag to increase the heap size to 1500 Mb  Can I increase the heap memory to 75  of physical memory  6 GB Heap

User · Answer

Yes  You Can   You can increase your heap memory to 75  of physical memory  6 GB Heap  or higher   Since You are using 64bit you can increase your heap size to your desired amount  In Case you are using 32bit it is limited to 4GB     java -Xms512m -Xmx6144m JavaApplication   Sets you with initial heap size to 512mb and maximum heapsize to 6GB   Hope it Helps

User · Answer

It is possible to increase heap size allocated by the JVM in eclipse directly  In eclipse IDE goto  Run---- Run Configurations---- Arguments  Enter -Xmx1g It is used to set the max size like Xmx256m or Xmx1g       m-- mb g--- gb

User · Answer

You can increase the Heap Size by passing JVM parameters -Xms and -Xmx like below   For Jar Files   java -jar -Xms4096M -Xmx6144M jarFilePath jar   For Java Files    java -Xms4096M -Xmx6144M ClassName   The above parameters increase the InitialHeapSize  -Xms  to 4GB  4096 MB  and MaxHeapSize -Xmx  to 6GB  6144 MB     But  the Young Generation Heap Size will remain same and the additional HeapSize will be added to the Old Generation Heap Size  To equalize the size of Young Gen Heap and Old Gen Heap  use -XX NewRatio 1 -XX -UseAdaptiveSizePolicy params   java -jar -Xms4096M -Xmx6144M -XX NewRatio 1 -XX -UseAdaptiveSizePolicy pathToJarFile jar   -XX NewRatio   Old Gen Heap Size   Young Gen HeapSize  You can play with this ratio to get your desired ratio

User · Answer

java -d64 -Xms512m -Xmx4g HelloWorld  where  -d64  Will enable 64-bit JVM -Xms512m  Will set initial heap size as 512 MB -Xmx4g  Will set maximum heap size as 4 GB  here java file name is   HelloWorld java

User · Answer

You can increase to 2GB on a 32 bit system  If you re on a 64 bit system you can go higher  No need to worry if you ve chosen incorrectly  if you ask for 5g on a 32 bit system java will complain about an invalid value and quit  As others have posted  use the cmd-line flags - e g  java -Xmx6g myprogram  You can get a full list  or a nearly full list  anyway  by typing java -X

User · Answer

This only works with 64 bit version of Java  Go to Control Panel and click on the Java icon  On the small window of Java Control Panel  click on the Java menu bar and then click on view button   If you have two Java platforms  disable the previous version of Java  then click on Runtime parameters text field and write -Xmx1024m or less than RAM size  Don t increase heap size equal to RAM otherwise your system will crash

User · Answer

Please use below command to change heap size to 6GB  export JAVA OPTS  -Xms6144m -Xmx6144m -XX NewSize 256m -XX MaxNewSize 356m -XX PermSize 256m -XX MaxPermSize 356m

User · Answer

Several people pointed out the specific answers for heap size with the jvm options of -Xms and -Xms  I want to point out that this is not the only type of memory options for the jvm  Specifically if you are get stack over flows  then you ll want to increase the size of the stack by adding an additional option like -Xss8m    For this problem  the jvm options of something like -Xms2g -Xmx6g -Xss8m would be a solution   I m sharing this information as my google searches on how to increase jvm memory took me to this solution  and the solutions didn t work with high amounts of memory allocation  Once I figured out what the specific settings were for  I was able to google how to increase the stack size and found the missing param     Hope this saves others time  as it would of saved me a ton of time

User · Answer

It is possible to increase heap size allocated by the JVM by using command line options Here we have 3 options  -Xms lt size gt         set initial Java heap size -Xmx lt size gt         set maximum Java heap size -Xss lt size gt         set java thread stack size  java -Xms16m -Xmx64m ClassName   In the above line we can set minimum heap to 16mb and maximum heap 64mb

User · Answer

I have problem running the py files in my java code using eclipse STS  getting PyException due to insufficient jvm heap memory  I have done the changes as mentioned below and I m able to resolve this issue  Below is my System configuration     And these are the changes I did in my workspace and voila it runs perfect now

User · Answer

On a 32-bit JVM  the largest heap size you can theoretically set is 4gb   To use a larger heap size  you need to use a 64-bit JVM  Try the following      java -Xmx6144M -d64   The -d64 flag is important as this tells the JVM to run in 64-bit mode

User · Answer

Can I increase the heap memory to 75    of physical memory 6GB Heap     Yes you can   In fact  you can increase to more than the amount of physical memory  if you want to   Whether it is a good idea to do this depends on how much else is running on your system   In particular  if the  working set  of the applications and services that are currently running significantly exceeds the available physical memory  your system is liable to  thrash   spending a lot of time moving virtual memory pages to and from disk   The net effect is that the system gets horribly slow

[java] Increase heap size in Java

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