Hi all, I have a question about reactor of "twisted.internet" module. I found below; The default reactor is "select"; [root@karadag internet]# pwd /usr/lib/python2.6/site-packages/Twisted-10.0.0-py2.6-linux-x86_64.egg/t wisted/internet [root@karadag internet]# cat reactor.py # Copyright (c) 2001-2008 Twisted Matrix Laboratories. # See LICENSE for details. """ The reactor is the Twisted event loop within Twisted, the loop which drives applications using Twisted. The reactor provides APIs for networking, threading, dispatching events, and more. The default reactor is based on C{select(2)} and will be installed if this module is imported without another reactor being explicitly installed. Regardless of which reactor is installed, importing this module is the correct way to get a reference to it. New application code should prefer to pass and accept the reactor as a parameter where it is needed, rather than relying on being able to import this module to get a reference. This simplifies unit testing and may make it easier to one day support multiple reactors (as a performance enhancement), though this is not currently possible. @see: L{IReactorCore<twisted.internet.interfaces.IReactorCore>} @see: L{IReactorTime<twisted.internet.interfaces.IReactorTime>} @see: L{IReactorProcess<twisted.internet.interfaces.IReactorProcess>} @see: L{IReactorTCP<twisted.internet.interfaces.IReactorTCP>} @see: L{IReactorSSL<twisted.internet.interfaces.IReactorSSL>} @see: L{IReactorUDP<twisted.internet.interfaces.IReactorUDP>} @see: L{IReactorMulticast<twisted.internet.interfaces.IReactorMulticast>} @see: L{IReactorUNIX<twisted.internet.interfaces.IReactorUNIX>} @see: L{IReactorUNIXDatagram<twisted.internet.interfaces.IReactorUNIXDatagram> } @see: L{IReactorFDSet<twisted.internet.interfaces.IReactorFDSet>} @see: L{IReactorThreads<twisted.internet.interfaces.IReactorThreads>} @see: L{IReactorArbitrary<twisted.internet.interfaces.IReactorArbitrary>} @see: L{IReactorPluggableResolver<twisted.internet.interfaces.IReactorPluggabl eResolver>} """ import sys del sys.modules['twisted.internet.reactor'] from twisted.internet import selectreactor selectreactor.install() --------------------------------------------------------------- [root@karadag internet]# twistd --help Usage: twistd [options] Options: ... -r, --reactor= Which reactor to use (see --help-reactors for a list of possibilities) --help Display this help and exit. twistd reads a twisted.application.service.Application out of a file and runs it. Commands: ftp An FTP server. telnet A simple, telnet-based remote debugging service. socks A SOCKSv4 proxy service. manhole-old An interactive remote debugger service. portforward A simple port-forwarder. web A general-purpose web server which can serve from a filesystem or application resource. inetd An inetd(8) replacement. news A news server. wokkel-component-server An XMPP Component Server xmpp-router An XMPP Router server words A modern words server toc An AIM TOC service. dns A domain name server. mail An email service manhole An interactive remote debugger service accessible via telnet and ssh and providing syntax coloring and basic line editing functionality. conch A Conch SSH service. thanks