Comments on: RftE: Python http://bethesignal.org/blog/2006/09/02/rfte-python/ where we're going, we don't need roads... Tue, 23 Jun 2009 13:17:17 +1000 http://wordpress.org/?v=2.8.1-beta2 hourly 1 By: Eero Tamminen http://bethesignal.org/blog/2006/09/02/rfte-python/#comment-517 Eero Tamminen Thu, 07 Sep 2006 18:38:33 +0000 http://perkypants.org/blog/2006/09/02/rfte-python/#comment-517 On my half-obsolete SUSE 9.1 distro, Python v2.3.3 does not poll select() in shell prompt when straced. Maybe this bug is of more recent origin? > 100ms is eternity for a modern PC Modern PC is a mobile device with power management in-core and dyntick patched kernel. It can't sleep at night if reptiles are interrupting it all the time... On my half-obsolete SUSE 9.1 distro, Python v2.3.3 does not poll select() in shell prompt when straced. Maybe this bug is of more recent origin?

> 100ms is eternity for a modern PC

Modern PC is a mobile device with power management in-core and dyntick patched kernel. It can’t sleep at night if reptiles are interrupting it all the time…

]]> By: Jon Dowland http://bethesignal.org/blog/2006/09/02/rfte-python/#comment-516 Jon Dowland Thu, 07 Sep 2006 14:34:50 +0000 http://perkypants.org/blog/2006/09/02/rfte-python/#comment-516 I've observed similar problems in a ruby program. I initially thought it was glade, but it happens in the irb interpreter too. It's probably readline for the latter, but that doesn't explain the former. (It wasn't glade). I’ve observed similar problems in a ruby program. I initially thought it was glade, but it happens in the irb interpreter too. It’s probably readline for the latter, but that doesn’t explain the former. (It wasn’t glade).

]]> By: amk http://bethesignal.org/blog/2006/09/02/rfte-python/#comment-515 amk Thu, 07 Sep 2006 13:26:55 +0000 http://perkypants.org/blog/2006/09/02/rfte-python/#comment-515 The link for this comment is to the Python bug for this. 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? The link for this comment is to the Python bug for this.

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?

]]> By: Brantley Harris http://bethesignal.org/blog/2006/09/02/rfte-python/#comment-512 Brantley Harris Wed, 06 Sep 2006 12:22:38 +0000 http://perkypants.org/blog/2006/09/02/rfte-python/#comment-512 I demand Guido apologize to Geraldo. I demand Guido apologize to Geraldo.

]]> By: 100ms http://bethesignal.org/blog/2006/09/02/rfte-python/#comment-507 100ms Sat, 02 Sep 2006 15:37:12 +0000 http://perkypants.org/blog/2006/09/02/rfte-python/#comment-507 100ms is eternity for a modern PC. In 100ms it can run about 400M cycles (if 4GHz) which is about 340M assembly instructions. Waking up every 340Million instructions to run 200 instructions is zero load. The computer will die of boredom. Not to mention it's the readline library... We are talking about orders of numbers here. 100ms is eternity for a modern PC. In 100ms it can run about 400M cycles (if 4GHz) which is about 340M assembly instructions. Waking up every 340Million instructions to run 200 instructions is zero load. The computer will die of boredom. Not to mention it’s the readline library…

We are talking about orders of numbers here.

]]> By: Ian http://bethesignal.org/blog/2006/09/02/rfte-python/#comment-506 Ian Sat, 02 Sep 2006 11:15:48 +0000 http://perkypants.org/blog/2006/09/02/rfte-python/#comment-506 It is readline, Ruby's irb produces exactly the same output. I don't think it's fair to label Python as not ready for the enterprise, please make a correction. It is readline, Ruby’s irb produces exactly the same output. I don’t think it’s fair to label Python as not ready for the enterprise, please make a correction.

]]> By: Osma http://bethesignal.org/blog/2006/09/02/rfte-python/#comment-505 Osma Sat, 02 Sep 2006 10:59:37 +0000 http://perkypants.org/blog/2006/09/02/rfte-python/#comment-505 python -c 'while True: pass' File "", line 1 'while ^ SyntaxError: invalid syntax No select(), that's the truth. python -c ‘while True: pass’
File “”, line 1
‘while
^
SyntaxError: invalid syntax

No select(), that’s the truth.

]]> By: bi http://bethesignal.org/blog/2006/09/02/rfte-python/#comment-504 bi Sat, 02 Sep 2006 08:38:27 +0000 http://perkypants.org/blog/2006/09/02/rfte-python/#comment-504 tail -f wakes up every one second. That's why Linux sucks, and why Windows and Mac rock, you tree-hugging Saddam-loving anti-capitalist cows. tail -f wakes up every one second. That’s why Linux sucks, and why Windows and Mac rock, you tree-hugging Saddam-loving anti-capitalist cows.

]]> By: Matt (msw) Wilson http://bethesignal.org/blog/2006/09/02/rfte-python/#comment-503 Matt (msw) Wilson Sat, 02 Sep 2006 03:01:12 +0000 http://perkypants.org/blog/2006/09/02/rfte-python/#comment-503 Kevin: it's the python readline module, not the readline library. Kevin: it’s the python readline module, not the readline library.

]]> By: Matt (msw) Wilson http://bethesignal.org/blog/2006/09/02/rfte-python/#comment-502 Matt (msw) Wilson Sat, 02 Sep 2006 02:58:36 +0000 http://perkypants.org/blog/2006/09/02/rfte-python/#comment-502 jdub: What you're seeing is a part of the python readline module. readline.c:767 says: struct timeval timeout = {0, 100000}; /* 0.1 seconds */ This .1 second sleep is *only* when you're sitting at a prompt using the readline module. jdub:

What you’re seeing is a part of the python readline module. readline.c:767 says:

struct timeval timeout = {0, 100000}; /* 0.1 seconds */

This .1 second sleep is *only* when you’re sitting at a prompt using the readline module.

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