twisted-theseus 0.14.0.0

Usage

The public interface of theseus is a class called Tracer. To get started:

from theseus import Tracer
t = Tracer()
t.install()

This is enough to start tracing execution. Eventually, the statistics will have to be written to disk:

with open('callgrind.theseus', 'wb') as outfile:
  t.write_data(outfile)

The output is written in callgrind format, which means that standard tools can be used to interpret the results, such as kcachegrind.

Additionally, theseus is aware of inlineCallbacks, and will rewrite call stacks to make them look “correct”. For example, given this code:

from twisted.internet import defer, task

@defer.inlineCallbacks
def func(reactor):
  yield task.deferLater(reactor, 1, lambda: None)

task.react(func)

The call stack according to theseus will look like this (most recent call last):

__main__ in <module>
twisted.internet.task in react
__main__ in func

Because theseus uses a trace hook instead of a profile hook, it’s possible to have both cProfile and theseus enabled at the same time.