# coding: utf-8

import time

def application(environ, start_response):
    status = '200 OK'
    output = str(time.time())
    time.sleep(5)
    output += '<br/>' + str(time.time())

    response_headers = [('Content-type', 'text/html; charset=utf-8'),
                        ('Content-Length', str(len(output)))]
    start_response(status, response_headers)

    return [output]

<VirtualHost *:80>
    ServerName localhost

    WSGIDaemonProcess main user=www-data group=www-data processes=1 threads=5
    #WSGIDaemonProcess main user=www-data group=www-data processes=5
    WSGIScriptAlias / /var/www/main/main.wsgi

    <Directory /var/www/main>
        WSGIProcessGroup main
        WSGIApplicationGroup %{GLOBAL}
        Order deny,allow
        Allow from all
    </Directory>

    ErrorLog /var/log/apache2/main_error_log
    CustomLog /var/log/apache2/main_log common
</VirtualHost>

Server MPM:     Worker
  threaded:     yes (fixed thread count)
    forked:     yes (variable process count)

StartServers
ServerLimit

wsgi.multithread
wsgi.multiprocess

<IfModule mpm_prefork_module>
    StartServers          5
    MinSpareServers       5
    MaxSpareServers      10
    MaxClients          150
    MaxRequestsPerChild   0
</IfModule>

wsgi.multithread
wsgi.multiprocess

$ apache2 -V
Server version: Apache/2.2.14 (Ubuntu)
Server built:   Apr 13 2010 19:29:28
Server's Module Magic Number: 20051115:23
Server loaded:  APR 1.3.8, APR-Util 1.3.9
Compiled using: APR 1.3.8, APR-Util 1.3.9
Architecture:   32-bit
Server MPM:     Worker
  threaded:     yes (fixed thread count)
    forked:     yes (variable process count)
Server compiled with....
 -D APACHE_MPM_DIR="server/mpm/worker"
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=128
 -D HTTPD_ROOT=""
 -D SUEXEC_BIN="/usr/lib/apache2/suexec"
 -D DEFAULT_PIDLOG="/var/run/apache2.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="/etc/apache2/mime.types"
 -D SERVER_CONFIG_FILE="/etc/apache2/apache2.conf"

mod_wsgi.application_group=, 
mod_wsgi.callable_object=application, 
mod_wsgi.listener_host=, 
mod_wsgi.listener_port=80, 
mod_wsgi.process_group=main, 
mod_wsgi.reload_mechanism=1, 
mod_wsgi.script_reloading=1, 
mod_wsgi.version=(2, 8), 
wsgi.errors=, 
wsgi.file_wrapper=, 
wsgi.input=, 
wsgi.multiprocess=True, 
wsgi.multithread=True, 
wsgi.run_once=False, 
wsgi.url_scheme=http, 
wsgi.version=(1, 0)

WSGIDaemonProcess main user=www-data group=www-data processes=1 threads=5