Each unit in the buffer contains an integer index and a timestamp. The system is implemented so that the writing process never has to wait. However, this means that if the writer gets far enough ahead of the reader that there are no more free buffers, the PerfDataBuffer will start throwing away data until there is a free buffer. If not, the 'lost' counter is incremented. As many buffers as available are written to the ostream out and released so they can be used again by the writer.
Description just deletes all the current info in buffer.
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