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.NET Forum / Languages / Managed C++ / September 2007Memory Limit in Unmanged C++
How do i get the amount of memory left for an application to allocate? We have an application that badly needs redesign because the current design can under certain circumstances run out of memory. Until we can redesign it we need to add protections to prevent a crash. I would like to determine when we are close to running out of memory and do a clean abort of the current operation. Using PSApi i can use GetProcessMemoryInfo to get the current WorkingSetSize. I can't seem to find a number i can compare this against to calculate approximate memory left. I know there is a hard 2 gig limit but i think this can be lower based on pagefile sizes and such so would like to make a Win32 call to get the limit. Any help on how to figure out how much memory is left for a process to use would be greatly appreciated. Leon Lambert > How do i get the amount of memory left for an application to allocate? We > have an application that badly needs redesign because the current design [quoted text clipped - 11 lines] > Any help on how to figure out how much memory is left for a process to use > would be greatly appreciated. http://msdn2.microsoft.com/en-us/library/aa366589.aspx http://msdn2.microsoft.com/en-us/library/aa366781.aspx >> How do i get the amount of memory left for an application to allocate? We >> have an application that badly needs redesign because the current design [quoted text clipped - 14 lines] > http://msdn2.microsoft.com/en-us/library/aa366589.aspx > http://msdn2.microsoft.com/en-us/library/aa366781.aspx Thanks this seems perfect. Leon Lambert > How do i get the amount of memory left for an application to allocate? We > have an application that badly needs redesign because the current design [quoted text clipped - 11 lines] > Any help on how to figure out how much memory is left for a process to use > would be greatly appreciated. Realize that "bytes free" is nowhere near as important as the number and sizes of free fragments on the heap. If possible, can you allocate a decent-sized buffer for each operation, use pieces of that buffer for the various temporary variables the operation needs, and then free the whole thing when the operation finishes? Then you will decrease fragmentation a lot, and also there's only one allocation that can fail. > Leon Lambert >> How do i get the amount of memory left for an application to allocate? We >> have an application that badly needs redesign because the current design [quoted text clipped - 22 lines] > >> Leon Lambert I am not trying to get to be able to allocate the last bit of memory available. I want a gross way of determining when a particular operation is going crazy allocating memory. For example let say that 2 gig is the maximum allocatable memory in the process. I would like to know when an operation is getting within 300 or 400 megabytes of that maximum. This leaves me plenty of space to do a clean abort. It would seem that link that Larry provided will yield the information I need. Thanks for taking the time to respond. Leon Lambert Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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