# \[Feature #2471\] want to choose a GC algorithm

**URL:** <https://www.ruby-forum.com/t/feature-2471-want-to-choose-a-gc-algorithm/180030>\
**Category:** Development\
**Created:** [December 10, 2009, 12:43am UTC](https://www.ruby-forum.com/t/feature-2471-want-to-choose-a-gc-algorithm/180030 "2009-12-10T00:43:16Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [December 10, 2009, 12:43am UTC](https://www.ruby-forum.com/t/feature-2471-want-to-choose-a-gc-algorithm/180030/1 "2009-12-10T00:43:16Z")

</div>

Feature #2471: want to choose a GC algorithm  
[http://redmine.ruby-lang.org/issues/show/2471](http://redmine.ruby-lang.org/issues/show/2471)

e$B5/I\<\<Te(B: \_ wanabe  
e$B%9%F!\<%?%9e(B: Open, e$BM%@hEYe(B: Normal  
e$B%+%F%4%je(B: core, Target version: 1.9.2

GC  
e$B$N%"%k%4%j%:%`$rJ#?tMQ0U$7$F!"A\*Br2DG=$K$9$k$N$O$I$&$G$7$g$&$+!#e(B  
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e$BA_BrBP\>]$H$7$F!“e(BauthorNari e$B$5$s$Ne(B LazySweep  
 [http://www.narihiro.info/resource/patch/rb\_gc\_lazy\_improve.diff](http://www.narihiro.info/resource/patch/rb_gc_lazy_improve.diff)  
e$B$r;H$o$;$F$$$?$@$-$^$7$?!#$”$j$,$H$&$4$6$$$^$9!#e(B  
e$B5/F0;~$K4D6-JQ?te(B RUBYGC e$B$Ke(B lazy e$B$rBeF~$7$F$_$/$3$H$Ge(B  
LazySweep e$B$,M-8z$K$J$j$^$9!#e(B

e$B%3%s%Q%$%k;~$Ke(B NOSELECT\_GC  
e$BDj?t$rDj5A$9$k$3$H$GL58z$K$9$k$3$H$b2DG=$G$9!#e(B  
e$B4X?t%]%$%s%?$r;2\>H$9$k$o$:$+$JCY1d$,5v$;$J$$?M8~$1$K0l1~MQ0U$7$^$7$?$,!“e(B  
e$BE,@Z$Ke(B GC  
e$B$rA\*Br$9$k$J$i$P$”$^$jLdBj$K$J$i$J$$$N$G$O$J$$$+$H;W$$$^$9!#e(B

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [December 10, 2009, 1:54am UTC](https://www.ruby-forum.com/t/feature-2471-want-to-choose-a-gc-algorithm/180030/2 "2009-12-10T01:54:41Z")

</div>

> e$BA_BrBP\>]$H$7$F!“e(BauthorNari e$B$5$s$Ne(B LazySweep  
> [http://www.narihiro.info/resource/patch/rb\_gc\_lazy\_improve.diff](http://www.narihiro.info/resource/patch/rb_gc_lazy_improve.diff)  
> e$B$r;H$o$;$F$$$?$@$-$^$7$?!#$”$j$,$H$&$4$6$$$^$9!#e(B  
> e$B5/F0;~$K4D6-JQ?te(B RUBYGC e$B$Ke(B lazy e$B$rBeF~$7$F$_$/$3$H$Ge(B LazySweep e$B$,M-8z$K$J$j$^$9!#e(B
> 
> e$B%3%s%Q%$%k;~$Ke(B NOSELECT\_GC e$BDj?t$rDj5A$9$k$3$H$GL58z$K$9$k$3$H$b2DG=$G$9!#e(B  
> e$B4X?t%]%$%s%?$r;2\>H$9$k$o$:$+$JCY1d$,5v$;$J$$?M8~$1$K0l1~MQ0U$7$^$7$?$,!“e(B  
> e$BE,@Z$Ke(B GC e$B$rA\*Br$9$k$J$i$P$”$^$jLdBj$K$J$i$J$$$N$G$O$J$$$+$H;W$$$^$9!#e(B

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e$B$3$l$OC/$,$&$l$7$/$J$k$3$H$r0U?^$7$F$$$k%Q%C%A$J$N$G$7$g$&$+!)e(B

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [December 10, 2009, 11:07am UTC](https://www.ruby-forum.com/t/feature-2471-want-to-choose-a-gc-algorithm/180030/3 "2009-12-10T11:07:13Z")

</div>

e$B%o%J%Y$H?=$7$^$9!#e(B

09/12/10 KOSAKI Motohiro [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> > Feature #2471: want to choose a GC algorithm  
> > GC e$B$N%"%k%4%j%:%`$rJ#?tMQ0U$7$F!"A\*Br2DG=$K$9$k$N$O$I$&$G$7$g$&$+!#e(B

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> e$B%j%9%/$,$"$j$^$9!#e(B
> 
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e$B$=$l$O$=$l$G2ACM$,$”$k$H;W$$$^$9!#e(B

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [December 10, 2009, 5:14pm UTC](https://www.ruby-forum.com/t/feature-2471-want-to-choose-a-gc-algorithm/180030/4 "2009-12-10T17:14:46Z")

</div>

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:39867] Re: [Feature #2471] want to choose a GC  
algorithm”  
on Fri, 11 Dec 2009 00:02:42 +0900, Narihiro N.  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

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- LazySweep

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

```
                            e$B$^$D$b$He(B e$B$f$-$R$me(B /:|)

```

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [December 10, 2009, 4:03pm UTC](https://www.ruby-forum.com/t/feature-2471-want-to-choose-a-gc-algorithm/180030/5 "2009-12-10T16:03:21Z")

</div>

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

GCe$B$HJ9$$$FMh$^$7$?!#e(B

2009e$BG/e(B12e$B7ne(B10e$BF|e(B9:54 KOSAKI Motohiro  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):  
(snip)

> > e$BE,@Z$Ke(B GC e$B$rA\*Br$9$k$J$i$P$"$^$jLdBj$K$J$i$J$$$N$G$O$J$$$+$H;W$$$^$9!#e(B
> 
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> 
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e$B$N$bLLGr$$$+$b$7$l$^$;$s!#e(B

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [December 11, 2009, 1:25am UTC](https://www.ruby-forum.com/t/feature-2471-want-to-choose-a-gc-algorithm/180030/6 "2009-12-11T01:25:44Z")

</div>

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

2009e$BG/e(B12e$B7ne(B11e$BF|e(B1:14 Yukihiro M.  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

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> 
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> e$B$J$N$G!”$3$N%Q%C%A$K$O;?@.$7$^$;$s!#$3$l$,e(Bcopy-on-write  
> friendly GCe$B$H$+e(Bmostly-copying GCe$B$N$h$&$J@-G=FC@-$,Bg$-$/JQ$oe(B  
> e$B$j$=$&$J$b$N$J$i!“@Z$jBX$($K0UL#$,$”$k$+$b$7$l$^$;$s!#e(B

e$B$J$k$[$I!#3N$+$K$=$&$G$9$M!#e(B  
LazySweepe$B$N%Q%C%A$O%P%0$,\<h$l$F$$$?$H;W$&$N$G!“e(Btrunke$B$K9g$o$;$?e(B  
e$B$b$N$r:n$C$F!”:FEYe(BMLe$B$KEj9F$7$^$9!#e(B

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [December 11, 2009, 4:54am UTC](https://www.ruby-forum.com/t/feature-2471-want-to-choose-a-gc-algorithm/180030/7 "2009-12-11T04:54:05Z")

</div>

e$B%A%1%C%He(B #2471 e$B$,99?7$5$l$^$7$?!#e(B (by \_ wanabe)

e$B%9%F!\<%?%9e(B Assignede$B$+$ie(BRejectede$B$KJQ99e(B

## LazySweep e$B$G$O%9%k!\<%W%C%H$,A}Bg$9$k$H$$$&OC$r$I$3$+$GJ9$$$?3P$($,$“$C$Fe(B e$B$=$l$,M}M3$Ge(B trunk e$B$KF~$i$J$$$N$+$H;W$C$F$$$^$7$?!#e(B e$BF~$i$J$+$C$?$N$OC1$K%P%0$NLdBj$G!”$9$G$K2r7h$5$l$F$$$k$H$$$&$3$H$J$N$Ge(B e$B%A%1%C%H$Oe(B Reject e$B$5$;$F$$$?$@$-$^$9!#$"$j$,$H$&$4$6$$$^$7$?!#e(B

[http://redmine.ruby-lang.org/issues/show/2471](http://redmine.ruby-lang.org/issues/show/2471)

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [March 31, 2010, 5:02pm UTC](https://www.ruby-forum.com/t/feature-2471-want-to-choose-a-gc-algorithm/180030/8 "2010-03-31T17:02:29Z")

</div>

e$B%A%1%C%He(B #2471 e$B$,99?7$5$l$^$7$?!#e(B (by \_ wanabe)

e$B%U%!%$%ke(B extgc.patch e$BDI2Ce(B  
e$B%9%F!\<%?%9e(B Rejectede$B$+$ie(BOpene$B$KJQ99e(B  
Target version 1.9.2e$B$+$ie(B1.9.xe$B$KJQ99e(B

e$B$:$$$V$sA0$N%A%1%C%H$G$9$\_$^$;$s$,!"\<q;]$,F1$8$J$N$Ge(Breopen  
e$B$5$;$FD:$-$^$9!#e(B

> copy-on-write friendly GCe$B$H$+e(Bmostly-copying GCe$B$N$h$&$J@-G=FC@-$,Bg$-$/JQ$oe(B  
> e$B$j$=$&$J$b$N$J$i!“@Z$jBX$($K0UL#$,$”$k$+$b$7$l$^$;$s!#e(B

e$B$H$N$3$H$J$N$G!“e(BBitmapMarking e$B$G%Q%C%A$r=q$$$F$\_$^$7$?!#e(B  
e$BA02s$HF1$8$/e(B nari  
e$B$5$s$N\<BAu$r;H$o$;$F$$$?$@$-$^$7$?!#$”$j$,$H$&$4$6$$$^$9!#e(B  
e$B$^$?!"@EE\*%j%s%/$;$:$K3HD%%i%$%V%i%j$HF1$8e(B .so  
e$B7A\<0$G%m!\<%I$9$k$h$&$K$7$^$7$?!#e(B  
e$BNc$($Pe(B ruby -I .ext/i686-linux -G gc\_bmp test.rb  
e$B$J$I$H$9$k$HFI$\_9~$^$l$k$H;W$$$^$9!#e(B  
prelude e$BA0$K3NDj$5$;$J$1$l$P$J$i$J$$$N$G!"e(Bgem  
e$B$N%m!\<%I%Q%9$K$OBP1~$G$-$^$;$s$G$7$?!#e(B

## rb\_gc\_load e$B$rI.F,$K\<BAu$,$$$m$$$m$R$I$$$N$G!“@0M}$7$F$+$i$H;W$C$F$$$?$N$G$9$,e(B e$B\<+J,$G$O$3$l0J\>e$I$&$9$k$3$H$b$G$-$J$=$&$J$N$G$H$j$”$($:%A%1%C%H$H$7$F;D$5$;$FD:$-$^$9!#$9$\_$^$;$s!#e(B

[http://redmine.ruby-lang.org/issues/show/2471](http://redmine.ruby-lang.org/issues/show/2471)