What Is The Maximum Heap Size Of 32 Flake Or 64-Bit Jvm Inwards Windows Too Linux?
Maximum heap size for 32 fleck or 64 fleck JVM looks slowly to decide past times looking at addressable retentiveness infinite similar 2^32 (4GB) for 32 fleck JVM in addition to 2^64 for 64 fleck JVM. Confusion starts hither because y'all tin non actually laid 4GB every bit maximum heap size for 32 fleck JVM using -Xmx JVM heap options. You volition get could non do the Java virtual machine Invalid maximum heap size: -Xmx error. There could survive many unlike argue why maximum heap infinite for JVM is less than at that topographic point theoretical trammel in addition to vary from i operating organisation to other e.g. unlike inward Windows, Linux in addition to Solaris. I guide keep seen duet of comments on my post 10 points on Java Heap Space regarding what is maximum heap infinite for Java or 32 fleck JVM or 64 fleck JVM in addition to why Windows allows exclusively upto 1.6G retentiveness every bit maximum heap infinite etc. In this Java article, I guide keep collected some of the oftentimes asked questions to a greater extent than or less maximum heap space on both 32 in addition to 64 fleck JVM in addition to tried to explicate them.
FAQ Maximum Java Heap Space on 32 in addition to 64 fleck JVM
Here is listing of some confusions I guide keep seen on Java programmers regarding maximum heap infinite of 32 in addition to 64 fleck Java Virtual Machines :- What is maximum heap size for 32 fleck JVM? 2GB or 4GB?
- Why my JVM non able to showtime on windows when maximum heap infinite to a greater extent than or less 1600M?
- Why Linux or Solaris let to a greater extent than maximum heap size than windows for same, 32 fleck JVM?
- Can nosotros laid to a greater extent than than 4GB every bit maximum heap size for 32 fleck JVM running on 64 fleck or x64 operating system?
- What is maximum heap size for 64 fleck or x64 JVM, Is it 8GB or 16GB?
- Can I specify to a greater extent than than 1GB every bit heap infinite if physical retentiveness is less than 1GB?
If y'all besides guide keep similar confusion on JVM maximum heap infinite no matter whether its for your ain Java application or whatever Java spider web or application server similar Tomcat, JBoss or WebLogic, This give-and-take applies to all of them.
What is maximum heap size for 32 fleck JVM? 2GB or 4GB?
This confusion comes because of sign bit, many programmer intend inward damage of signed integer in addition to they intend maximum addressable retentiveness (size of address bus) for 32 fleck architecture is 2^32-1 or 2GB and this confusion is supported past times fact that y'all tin non render maximum heap infinite every bit 2GB on windows machine. But this is wrong. Memory is zip to do amongst signed or unsigned fleck every bit at that topographic point is no negative retentiveness address. So theoretical trammel for maximum heap size on 32 fleck JVM is 4GB in addition to for 64 fleck JVM its 2^64.
Why JVM non able to showtime on Windows XP when maximum heap infinite to a greater extent than or less 1600M?
This occupation is nearly obvious on Windows platform similar Windows XP, which tries to allocate a contiguous chunk of retentiveness every bit requested past times -Xmx JVM parameters. Windows reserves some infinite for his ain in addition to seems besides allocate retentiveness to a greater extent than or less one-half of retentiveness address bar, which consequently reduces contiguous retentiveness infinite somewhere less than 2GB, to a greater extent than or less 1500 to 1600M in addition to when y'all rank to a greater extent than than this size, JVM throws mistake as.
Could non do the Java virtual machine.
Invalid initial heap size: -Xms1.5G
Remember, this trammel on heap infinite is due to windows operating system's ain behavior. You tin laid maximum heap space, to a greater extent than than this size inward Linux or Solaris. Though maximum heap size for 32 fleck or 64 fleck JVM volition ever survive less than theoretical trammel of addressable memory. By the agency y'all tin instruct this mistake due to many reasons, encounter How to fix Invalid Initial in addition to Maximum heap size inward JVM for to a greater extent than details.
Why Linux or Solaris let to a greater extent than maximum heap size than windows for same, 32 fleck JVM?
This point is besides related to second. Though at that topographic point could survive multiple reasons for that exactly I intend It could survive because of Windows trying to allocate contiguous chunk of retentiveness every bit Java heap space. Happy to listen your catch on this.
Can nosotros laid to a greater extent than than 4GB every bit maximum heap size for 32 fleck JVM running on 64 fleck or x64 operating system?
This is a tricky question every bit y'all are running 32 fleck JVM on x64 server. In my catch y'all tin laid upto 4GB for 32 fleck JVM exactly non to a greater extent than than that. Though x64 Servers has to a greater extent than retentiveness for his needs in addition to since every procedure tin guide keep upto 2^64 fleck it may expect perfectly OK for 32 fleck JVM to bring 4GB every bit maximum heap size. In practice, I guide keep tried both Linux in addition to Solaris servers setting maximum heap size every bit 4G exactly it didn’t accept. Solaris goes to a greater extent than unopen to 4GB past times allowing upto 3.6G (approx).
What is maximum heap size for 64 fleck or x64 JVM, Is it 8GB or 16GB?
This enquiry to a greater extent than often than non arise because of available physical retentiveness on machine. As no organisation currently guide keep 2^64 fleck of physical retentiveness or RAM in addition to often high halt servers has retentiveness to a greater extent than or less 8G, 16GB or 32GB. Theoretical maximum retentiveness for x64 machines is 2^64 fleck exactly i time again its depend on how much your operating systems allows.I read some where that Windows allowed maximum of 32GB for 64 fleck JVM.
Can I specify to a greater extent than than 1GB every bit heap infinite if physical retentiveness is less than 1GB ?
Theoretically yes, because operating organisation tin purpose virtual retentiveness in addition to swap pages betwixt physical retentiveness in addition to virtual memory, when at that topographic point is no room inward physical memory. Practically, if y'all are running on windows than it depends how far y'all tin go, I guide keep run Java programme amongst -Xmx1124M even though my machine has less than 1GB RAM.
That’s all on what is maximum Java heap infinite for 32 fleck in addition to 64 fleck JVM. As y'all encounter maximum heap size depends upon host operating system. Solaris in addition to Linux provides to a greater extent than heap infinite than windows in addition to that could survive i of the many argue that Java Server application to a greater extent than often than non run on UNIX based systems. Let me know what’s your idea in addition to experience on maximum Java heap infinite for x86 in addition to x64 JVM running on both x86 in addition to x64 machines.
Further Learning
Java Memory Management
Difference betwixt JRE, JDK in addition to JVM
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