Each time this case occurs, more memory is leaked.Ĭases like this would not usually have any immediate effects. The memory leak would occur if the floor number requested is the same floor that the elevator is on the condition for releasing the memory would be skipped. Release the memory we used to remember the floor number Get some memory, which will be used to remember the floor number This part of the program is run whenever anyone inside the elevator presses the button for a floor. The program in this case is part of some very simple software designed to control an elevator. The following example, written in pseudocode, is intended to show how a memory leak can come about, and its effects, without needing any programming knowledge. running on an operating system that does not automatically release memory on program termination.when a system device driver causes the leak.
where the leak occurs within the operating system or memory manager.where memory is very limited, such as in an embedded system or portable device, or where the program requires a very large amount of memory to begin with, leaving little margin for leakage.where the program can request memory - such as shared memory - that is not released, even when the program terminates.where new memory is allocated frequently for one-time tasks, such as when rendering the frames of a computer game or animated video.where the program runs for an extended time and consumes additional memory over time, such as background tasks on servers, but especially in embedded devices which may be left running for many years.This means that a memory leak in a program that only runs for a short time may not be noticed and is rarely serious. In modern operating systems, normal memory used by an application is released when the application terminates. Memory leaks may not be serious or even detectable by normal means. Eventually, in the worst case, too much of the available memory may become allocated and all or part of the system or device stops working correctly, the application fails, or the system slows down vastly due to thrashing. 4 Reference counting and cyclic referencesĪ memory leak reduces the performance of the computer by reducing the amount of available memory.
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