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.NET Forum / .NET Framework / CLR / September 2005Control Managed Heap size
Hi to all. Is there a way to control the size of the managed heap before it is allocated in the beginning of the application execution? The thing is that our app is deployed on a machine on which other apps run. There other apps require most of the computer's resources, and thus our .NET app must not consume to much memory. Thanks. The amount of memory used by your application is determined by ... your application, not by the initial size of the GC heap, the initial heap is 32 MB VIRTUAL (not committed) memory. The number of objects and their sizes will determine the size of the effective committed heap space, the more objects you keep alive the more memory you'll need. Willy. > Hi to all. > Is there a way to control the size of the managed heap before it is [quoted text clipped - 5 lines] > app must not consume to much memory. > Thanks. What does it mean non committed memory? Why does a simple hello world application requires 6,284MB of memory? > The amount of memory used by your application is determined by ... your > application, not by the initial size of the GC heap, the initial heap is 32 [quoted text clipped - 13 lines] > > app must not consume to much memory. > > Thanks. "Non Committed" memory is Memory that is reserved by the process but not yet committed by the OS. Please consult MSDN for details on how the memory management functions in Windows. A simple "Hello world" program needs to load some windows system DLL's the C runtime and the .NET runtime before it can run, that means a bunch of DLL are getting loaded (just like any other process) plus the .NET runtime (CLR runtime DLL's) and the initial managed heap. Willy. > What does it mean non committed memory? > Why does a simple hello world application requires 6,284MB of memory? [quoted text clipped - 17 lines] >> > app must not consume to much memory. >> > Thanks. So what your'e saying, is that my application reserves to itself more memory than it currently requires, but might use in the future - which brings me to my original question: is there a way to minimize the amount of reserved memory of my application? > "Non Committed" memory is Memory that is reserved by the process but not yet > committed by the OS. [quoted text clipped - 28 lines] > >> > app must not consume to much memory. > >> > Thanks. > So what your'e saying, is that my application reserves to itself more > memory > than it currently requires, but might use in the future - which brings me > to > my original question: is there a way to minimize the amount of reserved > memory of my application? The default segment sizes for the GC heap are set to 16 MB for the workstation GC and 64 MB for the server version GC. The GC starts with two segments one for the normal heap and one for the large object heap. What you can do is reserve smaller segments (min. 4MB per segment) by creating you own CLR hosting process using the framework v2.0 unmanaged hosting API's (search the MSDN docs. for details) , but this makes little sense as reserved memory does not take up RAM space, and as soon as the framework starts to create objects , the reserved space will be comitted and will grow beyond what was reserved and new segments will be created. Note that even so, you will never be able to run a minimal .NET program into something that takes less than ~6MB (the working set). What exactly are you trying to achieve? Willy. My team leader asked me to find a way to minimize our app memory consumption. He claims to use some method to compact the the app's memory consumption, and wan't to find a way to avoid it by minimizing the initial memory consumtion. Does it make any sence? > > So what your'e saying, is that my application reserves to itself more > > memory [quoted text clipped - 17 lines] > > Willy.
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