![]() ![]() How much heap size can be allocated if the physical memory/RAM is 3 GB? I got this question in written test. One quick way to use more heap on a multi-threaded java app is to reduce your Xss. Max Heap = 3.2GB - total thread-stackspace. Now this default thread-stackspace (Xss) is different on different operating systems and hence the difference between total memory youcan allocate to heap. The threads created by your java process have their own stackspace and that also has to fit into this 4GB limit (normally due to OS overhead this limit is 3.2GB and not 4GB). ![]() Maximum heap space on both 32 and 64 bit JVM and tried toįAQ Maximum Java Heap Space on 32 and 64 bit JVMĪ very important point about why you cannot allocate 4GB an only allocate a lot less than 4GB to a java process on a 32-bit machine. Java article, I have collected some of the frequently asked questions around Why Windows allows only up to 1.6G memory as maximum heap space etc. Regarding what is maximum heap space for Java or 32 bit JVM or 64 bit JVM and different in Windows, Linux, and Solaris.Ĭomments on my po st 10 points on Java Heap Space JVM is less than its theoretical limit and varies from one operating system to There could be much different reasons why maximum heap space for You will get could not create the Java virtual machine The confusion starts here because you can not really set 4GB as the maximum heap size for 32 bit (4GB) for 32 bit JVM and 2^64 for 64 bit JVM. ![]() Bit JVM looks easy to determine by looking at addressable memory space like 2^32 ![]()
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