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.NET Forum / .NET Framework / CLR / July 2004How to specify the initial memory size for a application?
I have a program that cost a lot of memory. During the load of the program, more and more memory is being allocated. I'd like to know if I specify a large initial memory size for the application, would its load speed be increased? If so, how can I specify that? Thanks! I do not know the specifics of your application, but surely doesn't look like a good sign that your application keeps consuming more and more memory. Take a look at the CLR Profiler tool from Microsoft and try to profile your application's memory requirements. Then you should be able to make better design decisions. I mean the program load more and more data from database at its startup time. After the data is load, the memory usage is stable. > I do not know the specifics of your application, but surely doesn't look like a good sign that your application keeps consuming more and more memory. > > Take a look at the CLR Profiler tool from Microsoft and try to profile your application's memory requirements. Then you should be able to make better design decisions. In that case - yes.. if you did specify data structures that are going to hold the data read from the database, and you explicitly allocate memory (say by declaring size of an array, etc.) - then you could save a little on loading time. However, again it is application-specific to see if such a "hard-coding" is a good practice or not. These are two different things. Allocating memory by declaring size of an array is something inside application, specifing initial size for the application is outside the program. If the initial memory size is large enough, allocating memory by declaring an array will cause less Win32 memory allocation and less page swap, and my program will run faster. > In that case - yes.. if you did specify data structures that are going to hold the data read from the database, and you explicitly allocate memory (say by declaring size of an array, etc.) - then you could save a little on loading time. > However, again it is application-specific to see if such a "hard-coding" is a good practice or not. How that? If you could, (but fortunately you can't) set the initial size to something larger than the free (RAM) memory, the system would start swapping at program start. If the system starts swapping when your application runs, it's an indication that you are consuming more memory than you have free in RAM. So it will always swap. There are only two things you can do in such situation: - Review your design in order to reduce the working set of your application. - Add more RAM. Willy. > These are two different things. Allocating memory by declaring size of an > array is something inside application, specifing initial size for the [quoted text clipped - 11 lines] >> However, again it is application-specific to see if such a "hard-coding" > is a good practice or not. > These are two different things. Allocating memory by declaring size of an > array is something inside application, specifing initial size for the > application is outside the program. If the initial memory size is large > enough, allocating memory by declaring an array will cause less Win32 memory > allocation and less page swap, and my program will run faster. There's a Win32 API called SetWorkingSet that affects how much swapping will happen; a program must be priviledged to call this API (it can reduce the RAM available to other applications). It seems Process.MinWorkSet and Process.MaxWorkSet do the same thing? I will try it. Thanks! > > These are two different things. Allocating memory by declaring size of an > > array is something inside application, specifing initial size for the [quoted text clipped - 6 lines] > happen; a program must be priviledged to call this API (it can reduce the > RAM available to other applications).
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