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copied!<p>You can use existing memory debugging tools for this, I found Memory Validator <a href="http://www.vmvalidator.com/cpp/memory/index.html" rel="nofollow noreferrer" title="Memory Validator">1</a> quite useful, it is able to track both API level (heap, new...) and OS level (Virtual Memory) allocations and show virtual memory maps.</p> <p>The other option which I also found very usefull is to be able to dump a map of the whole virtual space based on VirtualQuery function. My code for this looks like this:</p> <pre><code>void PrintVMMap() { size_t start = 0; // TODO: make portable - not compatible with /3GB, 64b OS or 64b app size_t end = 1U<<31; // map 32b user space only - kernel space not accessible SYSTEM_INFO si; GetSystemInfo(&si); size_t pageSize = si.dwPageSize; size_t longestFreeApp = 0; int index=0; for (size_t addr = start; addr<end; ) { MEMORY_BASIC_INFORMATION buffer; SIZE_T retSize = VirtualQuery((void *)addr,&buffer,sizeof(buffer)); if (retSize==sizeof(buffer) && buffer.RegionSize>0) { // dump information about this region printf(.... some buffer information here ....); // track longest feee region - usefull fragmentation indicator if (buffer.State&MEM_FREE) { if (buffer.RegionSize>longestFreeApp) longestFreeApp = buffer.RegionSize; } addr += buffer.RegionSize; index+= buffer.RegionSize/pageSize; } else { // always proceed addr += pageSize; index++; } } printf("Longest free VM region: %d",longestFreeApp); } </code></pre>

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