Run a full garbage collection cycle. The collector normally runs synchronously with a storage allocation request (i.e. it never happens when in code that does not allocate memory). In some circumstances, for example when a particular task is finished, it is convenient to explicitly run the collector and free up all memory used by that task. It can also be helpful to run a collection before starting a new task that would be annoying if it ran a collection in the middle of that task. Explicitly running a collection can also be done in a separate very low priority thread, so that if the program is idly waiting for input, memory can be cleaned up.
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