EMA C++ Performace Tools Guide : 2 Open Source Performance Tool Suite Overview : 2.4 What Is Measured and Reported : 2.4.4 CPU & Memory Usage : 2.4.4.2 Memory Usage Calculation
 
2.4.4.2 Memory Usage Calculation
Memory Usage is calculated using the "Resident Set Size," as provided by the respective operating system (OS). This measures the memory (in RAM) in use by the application.