How can each node collate its own statistics?

Each node can easily collate statistics about its own performance in its own variables (in its C protocol source code). Each node can then use a timer event to periodically report its statistics (either accumulated values, or instantaneous values that are then cleared by the timer event handling code). If the statistics are printed in a consistent format, to C's stdout stream, then external shellscripts (as described above) may be written to further collate or plot information.

A node may set a handler for the EV_SHUTDOWN event, and then print its statistics when the node is politely shutdown, or when the whole simulation finishes. Similarly, a node may set a handler for the EV_PERIODIC event, and then print its statistics whenever its handfler is called. More.

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