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#!/usr/bin/env python
#
# A simple benchmark of the tornado.gen module.
# Runs in two modes, testing new-style (@coroutine and Futures)
# and old-style (@engine and Tasks) coroutines.
from timeit import Timer
from tornado import gen
from tornado.options import options, define, parse_command_line
define('num', default=10000, help='number of iterations')
# These benchmarks are delicate. They hit various fast-paths in the gen
# machinery in order to stay synchronous so we don't need an IOLoop.
# This removes noise from the results, but it's easy to change things
# in a way that completely invalidates the results.
@gen.engine
def e2(callback):
callback()
@gen.engine
def e1():
for i in range(10):
yield gen.Task(e2)
@gen.coroutine
def c2():
pass
@gen.coroutine
def c1():
for i in range(10):
yield c2()
def main():
parse_command_line()
t = Timer(e1)
results = t.timeit(options.num) / options.num
print('engine: %0.3f ms per iteration' % (results * 1000))
t = Timer(c1)
results = t.timeit(options.num) / options.num
print('coroutine: %0.3f ms per iteration' % (results * 1000))
if __name__ == '__main__':
main()
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