id,summary,reporter,owner,description,type,status,priority,milestone,component,resolution,keywords,cc,branch,branch_author,launchpad_bug
4932,PortableGtkReactor I/O significantly slower than other common reactors,detly,,"""Slower under Windows"" means both:
  - slower than the select reactor or win32 reactor under Windows
  - slower than the select reactor or gtk2reactor under Linux

To observe the problem, do the following under Windows (I used XP):
  1. Run echoserv.py (it will listen on port 31415)
  2. Run echotest.py - it will use the default reactor, and should run in less than a second
  3. Uncomment lines 70-71, so that echotest.py uses the gtk2reactor
  4. Run echotest.py
  5. The script now takes 110s to run

This kind of slowdown might not be noticed when using a protocol that can just send a large chunk of data and await a small response, but the echotest.py script reflects common usage of serial communications (serial as in, RS232 connected devices): back-and-forth messaging over a long-lived protocol.

That it takes so much longer under Windows means that it is effectively impossible to have a Twisted/GTK application do any kind of fine-grained communication, serial or otherwise. In my actual application, this turned what was previously a 3 minute transfer (using threads and blocking calls) into a 25 hour transfer.",defect,new,normal,,core,,gtk2reactor gtk windows,,,,