Originally posted by: SystemAdmin

[ozkok said:]

Hi,

There are two methods in class IloEnv related to memory usage and they are defined in the manual as provided below

- getMemoryUsage (This member function returns a value in bytes indicating how full the heap is)
- getTotalMemoryUsage (This member function returns a value in bytes indicating how large the heap is)

I would like to know the exact difference between them.

Is there anybody who knows their difference?

Thanks in advance
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

[arnaud.schulz said:]

Hi,

getTotalMemoryUsage() returns the heap size and getMemoryUsage() returns the size actually used in the heap.

With this example:

 
      IloEnv env;
      IloInt nbItems = 5;

      cout << "Heap size is : " << env.getTotalMemoryUsage() << " bytes and we are using " << env.getMemoryUsage() << " bytes from it" << endl;<br />
        IloIntRange items(env, 1, 5);
cout << "==== After IntRange creation ====" << endl;<br /> cout << "Heap size is : " << env.getTotalMemoryUsage() << " bytes and we are using " << env.getMemoryUsage() << " bytes from it" << endl;<br />
items.end();
cout << "==== After IntRange.end() ====" << endl;<br /> cout << "Heap size is : " << env.getTotalMemoryUsage() << " bytes and we are using " << env.getMemoryUsage() << " bytes from it" << endl;<br />

the output is:
      Heap size is : 16032 bytes and we are using 1600 bytes from it

      ==== After IntRange creation ====
      Heap size is : 16032 bytes and we are using 1624 bytes from it

      ==== After IntRange.end() ====
      Heap size is : 16032 bytes and we are using 1600 bytes from it

Hope this helps,

Arnaud.


#CPLEXOptimizers
#DecisionOptimization