CollectGarbage()without specifying the optional argument
threshold. If you pass the optional threshold argument, however, then this value will be set as the new garbage collector threshold. This means that whenever the garbage size is bigger than the specified threshold in kilobytes, Hollywood will automatically run the garbage collector.
If you leave out the optional argument, Hollywood will immediately run the garbage collector and set a new threshold that is twice the size of garbage just collected.
To get information about the state of the garbage collector, call the GCInfo() function.