Question

I have one simple program of wsgi.

from wsgiref.simple_server import make_server
import time

def application(environ, start_response):
    response_body = 'Hello World'
    status = '200 OK'

    response_headers = [('Content-Type', 'text/plain'),
                    ('Content-Length', str(len(response_body)))]

    start_response(status, response_headers)

    if environ['PATH_INFO'] != '/favicon.ico':

        print "Time :", int(time.time())
        if int(time.time()) % 2:
            print "Even"
            time.sleep(10)
        else:
            print "Odd"
    return [response_body]

httpd = make_server('localhost', 8000, application)
httpd.serve_forever()

So as per the code if the timestamp is Even then it will send response after 10 second. But if the timestamp is Odd then it will send response directly without sleep.

So my question is if i will send 2 request and if first request will send the request in Even mode then my second request will be serve after completing first one.

I check the solution and found that ‘multiprocesscan solve this problem. I set the apache configuration withmultiprocess. Then I get the response forOddwithout completingEven` request.

I check how to set the multiprocess with make_server method of simple_server module. When I run the python /usr/lib64/python2.7/wsgiref/simple_server.py I get the output and last few lines are

wsgi.errors = <open file '<stderr>', mode 'w' at 0x7f22ba2a1270>
wsgi.file_wrapper = <class wsgiref.util.FileWrapper at 0x1647600>
wsgi.input = <socket._fileobject object at 0x1569cd0>
wsgi.multiprocess = False
wsgi.multithread = True
wsgi.run_once = False
wsgi.url_scheme = 'http'
wsgi.version = (1, 0)

So I was search how to set this make_server multiprocess so make_server can handle more then 1 request if any request is in progress.

Thx in advance.

Answer 1

If you’re using Apache/mod_wsgi than you don’t need the make_server/serve_forever stuff. Apache will handle that for you (as it is the web server). It will handle the processes and run the application callback function.

Make sure your Apache and mod_wsgi configuration allows multiprocess/multithread. Good reference is available here