DumpHeap uses pprof to inspect the heap.

DumpPProfStack uses pprof to inspect goroutines.

DumpRuntimeStack uses runtime to inspect goroutines.

NewPriorityQueue .....

NewRunningTimer creates a new timer which is running.

NewTimer creates a new timer which is paused.

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PriorityQueue uses a max heap, and provides efficient changing of priority.

Timer periodically executes `action`, waiting `delay` between invocation starts.

TimerState describes the state of a timer.