Jvm Max Heap Size If you want to use 32 bit references your heap is limited to 32 GB However if you are willing to use 64 bit references the size is likely to be limited by your OS just as it is with 32 bit JVM e g on Windows 32 bit this is 1 2 to 1 5 GB Note you will want your JVM heap to fit into main memory ideally inside one NUMA region
What i usually do concerning the jvm heap size is setting the max value really high to avoid the infamous OutOfMemoryException However this strategy or lack of strategy doesn t seem to be really smart My question is how to choose the min and max values and the difference between the two should max min be small or big For instance The InitialRAMPercentage JVM parameter allows us to configure the initial heap size of the Java application It s a percentage of the total memory of a physical server or container XX MaxRAMPercentage percent The MaxRAMPercentage parameter allows setting the maximum heap size for a JVM running with a large amount of memory greater than 200
Jvm Max Heap Size
Jvm Max Heap Size
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Perfect answer to the original question which isn t to just display the max allocated heap size but also the currently used heap Not shown on the screenshot but the jmap heap command displays free and used space in absolute and percentage values You may have to use jhsdb rather than jmap directly jhsdb jmap heap pid For Apache ant use ANT OPTS to affect the environment for the JVM that runs ant but not for the things that ant might launch The maximum heap size you can set depends entirely on the environment for most 32 bit systems the maximum amount of heap space you can request regardless of available memory is in the 2GiB range
The JVM will start with memory useage at the initial heap level If the maxheap is higher it will grow to the maxheap size as memory requirements exceed it s current memory So Xms512m Xmx512m JVM starts with 512 M never resizes Xms64m Xmx512m JVM starts with 64M grows up to max ceiling of 512 if mem requirements exceed 64 Server JVM heap configuration ergonomics are now the same as the Client except that the default maximum heap size for 32 bit JVMs is 1 gigabyte corresponding to a physical memory size of 4 gigabytes and for 64 bit JVMs is 32 gigabytes corresponding to a physical memory size of 128 gigabytes
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For example if you want a 512Mb initial and 1024Mb maximum heap size you could use under Windows SET JAVA OPTIONS Xms512m Xmx1024m under Linux export JAVA OPTIONS Xms512m Xmx1024m It is possible to read the default JVM heap size programmatically by using totalMemory method of Runtime class Use following code to read Use Xms1024m Xmx1024m to control your heap size 1024m is only for demonstration the exact number depends your system memory Setting minimum and maximum heap size to the same is usually a best practice since JVM
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If you want to use 32 bit references your heap is limited to 32 GB However if you are willing to use 64 bit references the size is likely to be limited by your OS just as it is with 32 bit JVM e g on Windows 32 bit this is 1 2 to 1 5 GB Note you will want your JVM heap to fit into main memory ideally inside one NUMA region
https://stackoverflow.com/questions/1651225
What i usually do concerning the jvm heap size is setting the max value really high to avoid the infamous OutOfMemoryException However this strategy or lack of strategy doesn t seem to be really smart My question is how to choose the min and max values and the difference between the two should max min be small or big For instance
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Jvm Max Heap Size - Server JVM heap configuration ergonomics are now the same as the Client except that the default maximum heap size for 32 bit JVMs is 1 gigabyte corresponding to a physical memory size of 4 gigabytes and for 64 bit JVMs is 32 gigabytes corresponding to a physical memory size of 128 gigabytes
