🎰 Java maximum memory on Windows XP - Stack Overflow

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Keep in mind that Windows has virtual memory management and the JVM only needs memory that is contiguous in its address space. So, other.


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When we store a reference in the heap we have to mark the corresponding byte in the card mark array. Likely causes of the variances are different security patches, C runtime versions, etc. Here's some info I found online for somebody asking that before, supposedly from a "VM god":. Any ideas why one machine would allow and another only ? Active Oldest Votes. Steve Kuo Steve Kuo You would notice a difference in the maximum between running the app in a bit shell or a bit shell, at least in my experience, although bit WindowsXP systems are rare. Steve Kuo. James A. What will get in your way are DLL's that get loaded in to your address space. Especially driver's dlls tend to fragment the memory, when loading into some predefined base address. I think modern operating system emulate continuous memory for the. Lots of the options affect memory division in and out of the heap. Third, I think you can't allocate the full 2 GB of address space because java wastes some memory internally for threads, JIT compiler, VM initialization, etc. Not fun, but if you are desperate Alternatively, you can just switch to bit Windows and a bit JVM. Uri Uri That is very interesting. MicSim MicSim Kire Haglin Kire Haglin 4, 16 16 silver badges 20 20 bronze badges. I think 64bit Windows will allow larger heaps. Just run the following and you'll get some idea:. If so, how do we explain this result: stackoverflow. The Java heap size limits for Windows are: maximum possible heap size on bit Java: 1. I always asked myself why MB, now I got it, thanks! Shouldn't it quietly settle for the best size above minimum? Everyone seems to be answering about contiguous memory, but have neglected to acknowledge a more pressing issue. But why does the JVM fail at startup if it cannot get the maximum heap size? We right shift the destination address of the store and use that to index the card mark array. William Denniss William Denniss To reuse portions of this answer of mine about Tomcat, but applies to any Java process : The Windows OS limits the memory allocation of a bit process to 2 GiB in total by default. Often some updated driver will stick itself in the middle of your address space. Here's some info I found online for somebody asking that before, supposedly from a "VM god": The reason we need a contiguous memory region for the heap is that we have a bunch of side data structures that are indexed by scaled offsets from the start of the heap. So the maximal amount of available memory is dictated by memory fragmentation. Just putting this here in case anyone else gets the above error message without specifying a large amount of memory like the questioner did. Device drivers and other kernel bits have their own address space the other 2GB of the 4GB bit space. Since the the xarchitecture supports paging to make it easy to rearrange the physical memory. I never accepted this as an answer and yet stackoverflow marked it as answered. So your hardware and its drivers determine how much memory you can get. Stauffer 2, 3 3 gold badges 20 20 silver badges 31 31 bronze badges. If you really want large heaps, switch to the bit JVM. AFAIK, it is not possible. Things that are likely to cut in to your address space aside from the usual stuff include security software, CBT software, spyware and other forms of malware. The JVM needs contiguous memory and depending on what else is running, what was running before, and how windows has managed memory you may be able to get up to 1. The reason we need a contiguous memory region for the heap is that we have a bunch of side data structures that are indexed by scaled offsets from the start of the heap. Furthermore, JVM flags and their default values change between versions. Usually we don't have trouble getting modest contiguous regions up to about 1. Christopher Smith Christopher Smith 4, 1 1 gold badge 29 29 silver badges 18 18 bronze badges. Use Process Explorer to see where in memory dll's are being loaded. Have you tried Harmony? I had not specified any memory arguments, and found I had to explicitly set a small amount as the default must have been too high. Sorry for following up on an ages old question, but this is the best answer i have seen so far. Keep in mind though, the dll is subject to get updated again and break things. All the machines I test with have virtual memory at least twice that of the physical RAM. Second, paging is a protected mode feature, not Harmony is dead isn't it? I think they planned to allow non-continuous memory. On Windohs, the problem is mostly that there are some libraries that get loaded before the JVM starts up that break up the address space. Maybe another JVM? ChristopherSmith, Btw, you mentioned " other programs running on the system shouldn't necessarily impact your heap size ". We know how to make chunked heaps, but there would be some overhead to using them. Stauffer James A. Sun's JVM needs contiguous memory. OS X had some tricks for bit user space with bit kernels, but I've not heard of any such thing for Windows. It could affected by your Virtual Memory settings also. Through trial and error it seems megabytes is the most I can allocate on this machine. Leaving you with more or less of that 2 GiB to play with To reuse portions of this answer of mine about Tomcat, but applies to any Java process :. I got this error message when running a java program from a limited memory virtuozzo VPS. Michael Michael 7, 7 7 gold badges 46 46 silver badges 83 83 bronze badges. This answer only addresses why he might only be able to allocate 2 GB, not why he can allocate 1. Also, note my point around how the heap setting is always a large fraction of the total process size - so a setting below that may still hit the 2 GiB process limit - another might be constrained by contiguous memory allocation.{/INSERTKEYS}{/PARAGRAPH} Two sources for this with statements from Sun engineers: forum blog. I think it has more to do with how Windows is configured as hinted by this response: Java -Xmx Option. This has to do with contiguous memory. Second, the address space is split in 2, half for kernel, half for user mode. Other modern operating systems [cough Linux] allow bit processes to use all or most of the 4 GiB addressable space. It seems that fragmentation can have quite an impact on how large a Java heap can be. Despite what others have suggested, while it will chew up more RAM, you will have much more contiguous virtual address space, and allocating 2GB contiguously would be trivial. Viewed k times. Active 4 months ago. This is because bit Windows processes cannot address more than 2 GiB of space. Unfortunately optimizations in Windows that minimize the relocation of DLL's during linking make it more likely you'll have a fragmented address space. For example, we track object reference updates with a "card mark array" that has one byte for each bytes of heap. The paragraph on JVM flags goes some way to explain why memory might vary between versions. We still need contiguous memory, but it's much easier to get in a bit address space. Learn more. Pacerier Sorry, I missed your query. JRockit from Bea acquired by Oracle can allocate memory from pieces. The OS and initial apps tend to allocate bits and pieces during loading which fragments the available RAM. {PARAGRAPH}{INSERTKEYS}Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Keep in mind that Windows has virtual memory management and the JVM only needs memory that is contiguous in its address space. Windows can't access more than 4GB actually, less because of memory holes so the page file is not used. He doesn't hit either your 1. So, other programs running on the system shouldn't necessarily impact your heap size. Asked 11 years, 9 months ago. Oracle JRockit , which can handle a non-contiguous heap, can have a Java heap size of 2. This doesn't help you getting a bigger Java heap, but now you know you can't go beyond these values. We have more requests for faster storage management than we do for larger heaps in the bit JVM.