It took me many days and hours to narrow it down. My application consumed 200 to 300 megabytes, despite the fact that I did everything. Finally, I narrowed that down to the reason std::deque.
Below is a snippet of code below.
Platform: Windows 8
Compiler: Visual Studio 2012
Here, just push the structures on deque, and then lay them back and finally replace them with an empty deck to completely free memory (as suggested in this or this answers )
#include <Psapi.h>
long long GetProcessPrivateBytes()
{
long long privatebytes;
HANDLE current_process;
PROCESS_MEMORY_COUNTERS_EX pmc;
current_process = GetCurrentProcess();
if (!GetProcessMemoryInfo(current_process, (PPROCESS_MEMORY_COUNTERS)&pmc, sizeof(pmc)))
{
return -1;
}
privatebytes = pmc.PrivateUsage;
return privatebytes ;
}
#define MYARRAY_SIZE 1024
#define MAX_ELEMENTS_IN_QUEUE (1024*1024)
struct MyStruct
{
unsigned char MyArray[MYARRAY_SIZE];
};
int _tmain(int argc, _TCHAR* argv[])
{
MyStruct mystruct;
std::queue<MyStruct> MyStructQueue;
while(1)
{
int MemoryConsumedByApplication = GetProcessPrivateBytes();
std::cout << "\n\nCurrent memory consumed by application " << (MemoryConsumedByApplication/1024)/1024 << " Megabytes";
if (MemoryConsumedByApplication > 128*1024*1014)
{
std::cout << "\nApplication still consuming too much memory. Press a key to quit the loop...";
_getch();
break;
}
std::cout << "\nFiling up queue with " << MAX_ELEMENTS_IN_QUEUE << " structs each of size " << MYARRAY_SIZE;
for (int i=0; i<MAX_ELEMENTS_IN_QUEUE; i++)
{
MyStructQueue.push(mystruct);
}
std::cout << "\nQueue filled up. Now poping back all elements...";
for (int i=0; i<MAX_ELEMENTS_IN_QUEUE; i++)
{
MyStructQueue.pop();
}
std::cout << "\nQueue poped back (Size " << MyStructQueue.size() << "). Now swaping with blank queue.";
std::queue<MyStruct>().swap(MyStructQueue);
}
std::cout << "\nPress a key to exit...";
_getch();
return 0;
}
The output of this code is:
Current memory consumed by application 0 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 5 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 5 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 6 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 5 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 6 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 6 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 6 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 6 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 6 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 6 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 7 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 7 Megabytes
Filing up queue with 1048576 structs each of size 1024
Queue filled up. Now poping back all elements...
Queue poped back (Size 0). Now swaping with blank queue.
Current memory consumed by application 198 Megabytes
Application still consuming too much memory. Press a key to quit the loop...
, , , , std::deque, std::deque.
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