[#47790] [ruby-trunk - Bug #7097][Open] Thread locals don't work inside Enumerator — "tenderlovemaking (Aaron Patterson)" <aaron@...>

32 messages 2012/10/01
[#47791] [ruby-trunk - Bug #7097][Assigned] Thread locals don't work inside Enumerator — "kosaki (Motohiro KOSAKI)" <kosaki.motohiro@...> 2012/10/01

[#47792] Re: [ruby-trunk - Bug #7097][Assigned] Thread locals don't work inside Enumerator — Aaron Patterson <tenderlove@...> 2012/10/01

On Tue, Oct 02, 2012 at 03:05:17AM +0900, kosaki (Motohiro KOSAKI) wrote:

[#47798] Re: [ruby-trunk - Bug #7097][Assigned] Thread locals don't work inside Enumerator — SASADA Koichi <ko1@...> 2012/10/01

(2012/10/02 3:12), Aaron Patterson wrote:

[#47800] Re: [ruby-trunk - Bug #7097][Assigned] Thread locals don't work inside Enumerator — SASADA Koichi <ko1@...> 2012/10/01

(2012/10/02 8:22), SASADA Koichi wrote:

[#47832] [ruby-trunk - Feature #7106][Open] FileUtils.touch should allow touching the symlink itself rather than the file the link points to — "cirrusthinking (Alessandro Diaferia)" <alessandro@...>

18 messages 2012/10/04

[#47847] [ruby-trunk - Bug #7110][Open] CGI: Add support for HTML5 <header> tag — "stomar (Marcus Stollsteimer)" <redmine@...>

16 messages 2012/10/05

[#47870] [ruby-trunk - Bug #7123][Open] Segmentation fault in ruby 1.9.3-p194 — "mscottford (M. Scott Ford)" <scott@...>

13 messages 2012/10/09

[#47880] [ruby-trunk - Bug #7134][Open] Signal handling bug in Mac OS X — "auastro (Andy Kitchen)" <kitchen.andy+rubybug@...>

17 messages 2012/10/10

[#47881] [ruby-trunk - Bug #7135][Open] GC bug in Ruby 1.9.3-p194? — "alexdowad (Alex Dowad)" <alexinbeijing@...>

21 messages 2012/10/10

[#47887] [ruby-trunk - Bug #7137][Open] Date.parse overly lenient when attempting to parse Monday? — "garysweaver (Gary Weaver)" <garysweaver@...>

12 messages 2012/10/10

[#47930] [ruby-trunk - Feature #7148][Open] Improved Tempfile w/o DelegateClass — "Glass_saga (Masaki Matsushita)" <glass.saga@...>

14 messages 2012/10/12

[#47970] [ruby-trunk - Bug #7158][Open] require is slow in its bookkeeping; can make Rails startup 2.2x faster — "gregprice (Greg Price)" <price@...>

30 messages 2012/10/14

[#48027] [Backport93 - Backport #7172][Open] [[Ruby 1.9:]] fix rbconfig for --enable-load-relative (v2) — "mpapis (Michal Papis)" <mpapis@...>

13 messages 2012/10/16

[#48053] [ruby-trunk - Bug #7180][Open] set_trace_func with error in proc block locks up Ruby with 100% cpu usage and no way to exit without killing proc — "garysweaver (Gary Weaver)" <garysweaver@...>

8 messages 2012/10/17

[#48072] [ruby-trunk - Bug #7184][Open] --disable-gems commandline parameter does not show up with ruby -h — "steenslag (siep korteling)" <s.korteling@...>

10 messages 2012/10/18

[#48130] [ruby-trunk - Bug #7200][Open] Setting external encoding with BOM| — "brixen (Brian Ford)" <brixen@...>

14 messages 2012/10/21

[#48191] [ANN] 2.0.0 feature freeze — Yusuke Endoh <mame@...>

Japanese later; 日本語は後で

37 messages 2012/10/24
[#48696] Re: [ANN] 2.0.0 feature freeze — SASADA Koichi <ko1@...> 2012/11/01

(2012/10/24 5:39), Yusuke Endoh wrote:

[#48260] [ruby-trunk - Bug #7214][Open] Ruby 2.0 breaks support for some debugging tools — "banister (john mair)" <jrmair@...>

22 messages 2012/10/25

[#48315] [ruby-trunk - Bug #7220][Open] StringIO#initialize_copy causes aliasing between the objects — "brixen (Brian Ford)" <brixen@...>

13 messages 2012/10/26

[#48413] [ruby-trunk - Bug #7221][Open] Unable to compile kgio under 1.9.3 with error: ruby-1.9.3-<plvl>/lib/ruby/1.9.1/mkmf.rb:597:in `Integer': can't convert nil into Integer (TypeError) — "davidderyldowney (David Deryl Downey)" <me@...>

9 messages 2012/10/27

[#48549] [ruby-trunk - Feature #7240][Open] Inheritable #included/#extended Hooks For Modules — "apotonick (Nick Sutterer)" <apotonick@...>

14 messages 2012/10/29

[#48551] [ruby-trunk - Feature #7241][Open] Enumerable#to_h proposal — "nathan.f77 (Nathan Broadbent)" <nathan.f77@...>

23 messages 2012/10/29

[#48552] [ruby-trunk - Bug #7242][Open] Bignum mathematical accuracy regression in r31695 — "mhall (Matthew Hall)" <mhall@...>

11 messages 2012/10/29

[ruby-core:47986] [ruby-trunk - Feature #905] Add String.new(fixnum) to preallocate large buffer

From: "headius (Charles Nutter)" <headius@...>
Date: 2012-10-14 20:02:18 UTC
List: ruby-core #47986
Issue #905 has been updated by headius (Charles Nutter).


I do not believe for a moment that realloc or mremap can in all cases perform the operation in O(1) time, and the docs seem to agree with me...first based on the doc above for realloc, and then for this doc on mremap:

       MREMAP_MAYMOVE
              By default, if there is not sufficient space to expand a mapping at its current location, then mremap() fails.  If this  flag
              is specified, then the kernel is permitted to relocate the mapping to a new virtual address, if necessary.  If the mapping is
              relocated, then absolute pointers into the old mapping location become invalid (offsets relative to the starting  address  of
              the mapping should be employed).

It seems to me that preallocation is most definitely useful, even in the presence of realloc and mremap. I would like to see it added.
----------------------------------------
Feature #905: Add String.new(fixnum) to preallocate large buffer
https://bugs.ruby-lang.org/issues/905#change-30669

Author: headius (Charles Nutter)
Status: Feedback
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: 
Target version: 2.0.0


=begin
 Because Strings are used in ruby as arbitrary byte buffers, and because the cost of growing a String increases as it gets larger (especially when it starts small), String.new should support a form that takes a fixnum and ensures the backing store will have at least that much room. This is analogous to Array.new(fixnum) which does the same thing.
 
 The simple implementation of this would just add a Fixnum check to the String.new method, and the result would be an empty string with that size buffer. This would allow heavy string-appending algorithms and libraries (like ERb) to avoid doing so many memory copies while they run.
=end



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