Relevant info

About me

in first place, because we're talking about relevant info.

Trace

<https://docs.python.org/3.5/library/sys.html#sys.settrace>

<https://docs.python.org/3.5/library/inspect.html#types-and-members>

Profile

<https://docs.python.org/3.5/library/profile.html>

wsgi

spec: <https://docs.python.org/3.5/library/wsgiref.html>

django adapter:

import os
import os.path
import cProfile as profile
from django.core.wsgi import get_wsgi_application

django_application = get_wsgi_application()

def application(environ, start_response):
    """ wsgi application middleware """
    response_body = []
    def catching_start_response(status, headers, exc_info=None):
        """ wsgi start_response wrapper for streaming responses """
        start_response(status, headers, exc_info)
        return response_body.append

    def wrapper():
        """ wrapper for streaming wsgi responses """
        response = django_application(environ, catching_start_response)
        response_body.extend(response)
        if hasattr(response, 'close'):
            response.close()

    # profiling
    p = profile.Profile()
    p.runcall(wrapper)
    response = b''.join(response_body)

    # create profile file in tmp with url-based filename
    filename = '/tmp/{}.{}'.format(
        environ['REQUEST_METHOD'],
        environ.get('PATH_INFO').strip('/').replace('/', '.') or 'root'
        )
    p.dump_stats(filename)
    return [response]

profile

python -m profile -o script.profile script.py

python -m cProfile -o script.profile script.py

profile visualizers

runsnake script.profile (only python2)

snakeviz script.profile (only cprofile files)