Bugs item #1552726, was opened at 2006-09-05 10:42 Message generated for change (Comment added) made by akuchling You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1552726&group_id=5470
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Python Library Group: None Status: Open Resolution: None Priority: 5 Submitted By: Richard Boulton (richardb) Assigned to: Nobody/Anonymous (nobody) Summary: Python polls unnecessarily every 0.1 second when interactive Initial Comment: When python is running an interactive session, and is idle, it calls "select" with a timeout of 0.1 seconds repeatedly. This is intended to allow PyOS_InputHook() to be called every 0.1 seconds, but happens even if PyOS_InputHook() isn't being used (ie, is NULL). To reproduce: - start a python session - attach to it using strace -p PID - observe that python repeatedly This isn't a significant problem, since it only affects idle interactive python sessions and uses only a tiny bit of CPU, but people are whinging about it (though some appear to be doing so tongue-in-cheek) and it would be nice to fix it. The attached patch (against Python-2.5c1) modifies the readline.c module so that the polling doesn't happen unless PyOS_InputHook is not NULL. ---------------------------------------------------------------------- >Comment By: A.M. Kuchling (akuchling) Date: 2006-09-07 09:24 Message: Logged In: YES user_id=11375 Original report: http://perkypants.org/blog/2006/09/02/rfte-python This is tied to the version of readline being used; the select code is only used if HAVE_RL_CALLBACK is defined, and a comment in Python's configure.in claims it's only defined with readline 2.1. Current versions of readline are 4.3 and 5.1; are people still using such an ancient version of readline? ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1552726&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
