Micro-benchmarks for gauge deltas

microbench_gaugedelta.py

import timeit
import random

acc = None

def sample():
    value = random.random()
    if value >= 0.5:
	return "+" + str(value)
    else:
	return str(value)

# 
def gauge_delta():
    global acc
    value = sample()
    try:
        if len(str(value)) > 0 and str(value)[0] in ('+'):
            if acc is None:
                acc = 0
            acc += float(value)
        else:
            acc = float(value)
    except ValueError:
        raise Exception("Cannot parse gauge value")

def gauge():
    value = sample()
    try:
	acc = int(value)
    except ValueError:
	try:
	    acc = float(value)
	except ValueError:
	    raise Exception("Metric value must be a number")

def gauge_fast():
    value = sample()
    try:
	acc = float(value)
    except ValueError:
	raise Exception("Metric value must be a number")

def main():
    print "--- Gauge only ---"
    print timeit.repeat("gauge()", "from __main__ import gauge") 
    print "--- Gauge delta ---"
    print timeit.repeat("gauge_delta()", "from __main__ import gauge_delta, acc")
    print "--- Gauge fast ---"
    print timeit.repeat("gauge_fast()", "from __main__ import gauge_fast")

if __name__ == '__main__':
    main()

➜  dd-agent git:(alq666/gauge-delta) ✗ python microbench_gaugedelta.py
--- Gauge only ---
[3.3604989051818848, 3.368734121322632, 3.3440170288085938]
--- Gauge delta ---
[1.3949830532073975, 1.3639380931854248, 1.349412202835083]
--- Gauge fast ---
[0.9618160724639893, 1.0241508483886719, 1.0283880233764648]