[#35446] [Ruby 1.9 - Bug #4477][Open] Kernel:exec and backtick (`) don't work for certain system commands — Joachim Wuttke <j.wuttke@...>

10 messages 2011/03/07

[#35476] [Ruby 1.9 - Bug #4489][Open] [PATCH] Encodings with /-(unix|dos|mac)\Z/ — "James M. Lawrence" <quixoticsycophant@...>

20 messages 2011/03/10

[#35552] [Ruby 1.9 - Feature #4523][Open] Kernel#require to return the path of the loaded file — Alex Young <alex@...>

14 messages 2011/03/24

[#35565] [Ruby 1.9 - Feature #4531][Open] [PATCH 0/7] use poll() instead of select() in certain cases — Eric Wong <normalperson@...>

33 messages 2011/03/28

[#35566] [Ruby 1.9 - Feature #4532][Open] [PATCH] add IO#pread and IO#pwrite methods — Eric Wong <normalperson@...>

12 messages 2011/03/28

[#35586] [Ruby 1.9 - Feature #4538][Open] [PATCH (cleanup)] avoid unnecessary select() calls before doing I/O — Eric Wong <normalperson@...>

9 messages 2011/03/29

[ruby-core:35526] [Ruby 1.9 - Bug #4510][Open] Float#round(n) is O(n)

From: Alex Young <alex@...>
Date: 2011-03-18 13:24:57 UTC
List: ruby-core #35526
Issue #4510 has been reported by Alex Young.

----------------------------------------
Bug #4510: Float#round(n) is O(n)
http://redmine.ruby-lang.org/issues/4510

Author: Alex Young
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 1.9.2p136 (2010-12-25 revision 30365) [i686-linux]


The current implementation of Float#round(n) is O(n). This causes a minor issue with rubyspec, which includes this:

  0.8346268.round(-2.0**30).should == 0

which would take about 5 minutes to complete on my machine, during which time the interpreter is locked, doesn't respond to signals, and certainly won't brook any Timeout interruption.

Attached is a patch to replace the problematic part with a call to pow(3).


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