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Memory management when using threads

1) I tried to find how memory will be allocated when we use threads in the program, but cannot find the answer. Here What and where is the stack and heap? - how the stack and heap work when calling one program. But what happens when it comes to threading programs?

2) Using a parallel area OpenMP creates threads, and parallel code will be executed simultaneously in each thread. Does this allocate more memory space than memory occupied by the same code with sequential execution?

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