parse_events.py

#!/usr/bin/env python3

import fileinput
import json
import statistics

def pr_line(i, j, k):
    print("%s %s %s" % (i.ljust(40), j.rjust(10), k.rjust(10)))

def main():
    events = {}

    for line in fileinput.input():
        data = json.loads(line)

        method = data["method"]["fullname"]
        duration = data["timings"]["duration_sec"]

        if not events.get(method):
            events[method] = []
        events[method].append(duration)

    pr_line("METHOD", "AVG", "STDDEV")
    for event, timings in events.items():
        mean = "%.4f" % statistics.mean(timings)
        stdev = "%.4f" % statistics.stdev(timings)
        pr_line(event, mean, stdev)

if __name__ ==  "__main__":
    main()