PooledProcessMixIn For Python

Fast Concurrent Pool of preforked-processes and threads Mix-in for python’s socket server Replace the usual ThreadingMixIn and ForkingMixIn

This is a pure-python module that provides asynchronous mix-in similar to standard ThreadingMixIn and ForkingMixIn but provides better performance by utilizing a pool of processes forked at initialization time each process allocate a pool of given number of threads

Installation and Dependencies

This module has no external dependencies other than the standard python library.

To get the latest development snapshot type the following command

git clone https://github.com/oleglpts/python-PooledProcessMixIn

Example

from PooledProcessMixIn import PooledProcessMixIn
from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer

# ... define MyTestHandler somewhere

class MyHTTPTest (PooledProcessMixIn, HTTPServer):
    def __init__(self):
        self._process_n=7  # if not set will default to number of CPU cores
        self._thread_n=64  # if not set will default to number of threads
        HTTPServer.__init__(self, ('127.0.0.1',8888), MyTestHandler)
        self._init_pool() # this is optional, will be called automatically
        print "listing on http://127.0.0.1:8888/"

Details

You can set initial number of processes by setting self._process_n before calling self._init_pool()

You can set initial number of threads for each forked process by setting self._thread_n before calling self._init_pool()

You should call self._init_pool() AFTER super class __init__ but if you did not call it, it will be called automatically when we get first request

When Benchmarked against ThreadingMixIn and ForkingMixIn, it gives double performance (was able to handle about 1,500 request per second while other mix-ins reached 800 requests/second )

siege -b -c 100 -t10s localhost:8888/test
      Date & Time,  Trans,  Elap Time,  Data Trans,  Resp Time,  Trans Rate,  Throughput,  Concurrent,    OKAY,   Failed
2012-08-02 12:51:47,  14663,       9.58,           0,       0.01,     1530.58,        0.00,       22.87,   14663,       0
2012-08-02 12:52:44,   7653,       9.58,           0,       0.04,      798.85,        0.00,       29.42,    7653,       5
2012-08-02 12:53:14,   7726,       9.47,           0,       0.05,      815.84,        0.00,       43.57,    7726,       0

Can I use it to run my Django applications ?

Yes, Django provides WSGI application which can be used like the wsgi-demo included in this packages

import sys, os
    
from PooledProcessMixIn import PooledProcessMixIn
from wsgiref.simple_server import make_server, WSGIServer
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mysite.settings")
    
d=os.path.dirname(__file__)
sys.path.insert(0, d)
sys.path.insert(0, os.path.join(d, ".."))
    
from django import VERSION as DJ_VERSION
if DJ_VERSION>=(1,4):
    from django.core.wsgi import get_wsgi_application
else:
    from django.core.handlers.wsgi import WSGIHandler as get_wsgi_application
    
class WSGIServerPool(PooledProcessMixIn, WSGIServer):
    pass
    
application = get_wsgi_application()
make_server('127.0.0.1', 8080, application, server_class=WSGIServerPool).serve_forever()