# 1.9$B$N(Brequire$B$,CY$$(B

**URL:** <https://www.ruby-forum.com/t/1-9-b-n-brequire-b-cy-b/185056>\
**Category:** Development\
**Created:** [March 12, 2010, 6:38pm UTC](https://www.ruby-forum.com/t/1-9-b-n-brequire-b-cy-b/185056 "2010-03-12T18:38:29Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Shugo\_M](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7ea924/32.png) [@Shugo\_M](https://www.ruby-forum.com/u/Shugo_M)\
**Post date:** [March 12, 2010, 6:38pm UTC](https://www.ruby-forum.com/t/1-9-b-n-brequire-b-cy-b/185056/1 "2010-03-12T18:38:29Z")

</div>

前田です。

またYehuda K.æƒ…å ±ãªã®ã§ã™ãŒã€Ruby 1.9で、$:ã®è¦ç´ ãŒå¤šã„ã¨requireが遅いようです。

defiant:build$ cat t.rb  
1000.times {  
$:.push “/opt/ruby/1.8”  
}  
1000.times do  
require “rational”  
end  
defiant:build$ time ruby -v t.rb  
ruby 1.8.7 (2009-06-12 patchlevel 174) [i486-linux]  
ruby -v t.rb 0.07s user 0.08s system 90% cpu 0.164 total  
defiant:build$ time ruby-trunk -v t.rb  
ruby 1.9.2dev (2010-03-10 trunk 26866) [i686-linux]  
lib/rational.rb is deprecated  
ruby-trunk -v t.rb 3.51s user 1.20s system 99% cpu 4.734 total

この例は極端ですが、Gemパッケージがたくさん入っている状態でRailsを  
動かしたりすると、結構影響が大きいそうです。

どうも、rb\_get\_expanded\_load\_path()が何度も呼ばれるせいでこんなに  
遅いようなのですが、$:の中身がすべて絶対パスの時は、expand\_pathを  
呼ばずにそのまま$:の値を使うようにしてはどうでしょうか。

添付のパッチでかなり早くなりました。

defiant:build$ time ./ruby-trunk -v t.rb  
ruby 1.9.2dev (2010-03-11 trunk 26868) [i686-linux]  
lib/rational.rb is deprecated  
./ruby-trunk -v t.rb 0.28s user 0.01s system 99% cpu 0.293 total

$:に相対パスが入っているとだめですが、幸い1.9では$:から.が削除されて  
いますし、require\_relativeも使えるので$:に相対パスを入れたいというニーズ  
もあまりないんじゃないかと思っています。

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<div class="post-metadata">

**Author:** ![Shugo\_M](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7ea924/32.png) [@Shugo\_M](https://www.ruby-forum.com/u/Shugo_M)\
**Post date:** [March 12, 2010, 7:11pm UTC](https://www.ruby-forum.com/t/1-9-b-n-brequire-b-cy-b/185056/2 "2010-03-12T19:11:52Z")

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e$B@.@%$G$9!#e(B

e$BFC$K0U8+$O$J$$$s$G$9$,!";2\>HDI2C$@$1e(B  
[ruby-core:28113]  
[http://redmine.ruby-lang.org/issues/show/2723](http://redmine.ruby-lang.org/issues/show/2723)

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<div class="post-metadata">

**Author:** ![Shugo\_M](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7ea924/32.png) [@Shugo\_M](https://www.ruby-forum.com/u/Shugo_M)\
**Post date:** [March 12, 2010, 11:47pm UTC](https://www.ruby-forum.com/t/1-9-b-n-brequire-b-cy-b/185056/3 "2010-03-12T23:47:31Z")

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In message “Re: [ruby-dev:40603] 1.9e$B$Ne(Brequiree$B$,CY$$e(B”  
on Sat, 13 Mar 2010 02:38:01 +0900, Shugo M.  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:  
|  
|e$B$^$?e(BYehuda K.e$B\>pJs$J$N$G$9$,!"e(BRuby 1.9e$B$G!"e(B$:e$B$NMWAG$,B?$$$He(Brequiree$B$,CY$$$h$&$G$9!#e(B

|e$B$I$&$b!"e(Brb\_get\_expanded\_load\_path()e$B$,2?EY$b8F$P$l$k$;$$$G$3$s$J$Ke(B  
|e$BCY$$$h$&$J$N$G$9$,!"e(B$:e$B$NCf?H$,$9$Y$F@dBP%Q%9$N;~$O!"e(Bexpand\_pathe$B$re(B  
|e$B8F$P$:$K$=$N$^$^e(B$:e$B$NCM$r;H$&$h$&$K$7$F$O$I$&$G$7$g$&$+!#e(B  
|  
|e$BE:IU$N%Q%C%A$G$+$J$jAa$/$J$j$^$7$?!#e(B

e$B$$$$$s$8$c$J$$$G$7$g$&$+!#%3%\_%C%H$7$F$/$@$5$$!#e(B

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<div class="post-metadata">

**Author:** ![Shugo\_M](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7ea924/32.png) [@Shugo\_M](https://www.ruby-forum.com/u/Shugo_M)\
**Post date:** [March 13, 2010, 2:25am UTC](https://www.ruby-forum.com/t/1-9-b-n-brequire-b-cy-b/185056/4 "2010-03-13T02:25:01Z")

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e$BA0ED$G$9!#e(B

e$B$9$G$Ke(BRedminee$B$KEPO?$5$l$F$?$s$G$9$M!#e(B

2010e$BG/e(B3e$B7ne(B13e$BF|e(B7:47 Yukihiro M.  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> |e$B$I$&$b!"e(Brb\_get\_expanded\_load\_path()e$B$,2?EY$b8F$P$l$k$;$$$G$3$s$J$Ke(B  
> |e$BCY$$$h$&$J$N$G$9$,!"e(B$:e$B$NCf?H$,$9$Y$F@dBP%Q%9$N;~$O!"e(Bexpand\_pathe$B$re(B  
> |e$B8F$P$:$K$=$N$^$^e(B$:e$B$NCM$r;H$&$h$&$K$7$F$O$I$&$G$7$g$&$+!#e(B  
> |  
> |e$BE:IU$N%Q%C%A$G$+$J$jAa$/$J$j$^$7$?!#e(B
> 
> e$B$$$$$s$8$c$J$$$G$7$g$&$+!#%3%\_%C%H$7$F$/$@$5$$!#e(B

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