Question

1. Explain how the reference count garbage collection works? Which limitation is removed using TBD stack and how? [25 points]

Answer 1

• Garbage collection are mainly used in the Python programming and it also helps in the memory management.
• It is an automatic memory management in which it will free the memory after the usage of the RAM from the CPU .

Working of Garbage collection:

• The garbage collector used to keep a list of all items in his mind. In the first generation of the garbage collector, a new object will begin its life. If Python performs a generation garbage collection operation and the object is surviving , it then passes into a second, older generation.
• The Python garbage collector will be having a total of three generations, and an object would be passing into an older generation if the garbage collection phase of its current generation persists.
• For each generation, the garbage collection module will have a threshold number of objects. If the number of items reaches to the threshold, then the garbage collector would start a collection process. For any object that survives this phase, it would be passed through an older generation.
• The program to get the threshold count would be:
• import gc
  gc.get_threshold()

TBD stands for To Be decremented ,and its a kind of cross reference stack used in the python programming . It tells the how operation would be decremented based on the collection of memory.

The function would be creating the new cell which will be referred to top of the stack and then creating the reference by increasing the reference count and followed by the destroying of the reference with the help of stack reference.