$B@>;3OB9-$G$9!#(B
$B8=:_$N(B trunk $B$r(B --enable-debug-env $BIU$-$G(B configure $B$7$F(B
$B4D6-JQ?t$K(B RUBY_DEBUG=gc_stress $B$r;XDj$7$F5/F0$9$k$H(B
GC.stress $B$K(B Fixnum $B$N(B 0 $B$,@_Dj$5$l$^$9!#(B
% RUBY_DEBUG=gc_stress ruby -v --disable=gems -e ‘p GC.stress’
ruby 2.1.0dev (2013-06-19 trunk 41429) [x86_64-linux]
0
GC.stress $B$,(B Fixnum $B$+$I$&$+$r8+$F$$$kItJ,$,(B
garbage_collect_body $B$7$+$J$/$F!"(B GC.stress = true $B$H(B
GC.stress = 0 $B$,F1$85sF0$K$J$C$F$$$k$h$&$K8+$($^$9$,!"(B
$B0U?^E*$G$7$g$&$+(B?
$B$=$l$+$i(B Fixnum $B$G$$$m$$$m%U%i%0$r@_Dj=PMh$k$N$J$i(B
RUBY_DEBUG $B$G$b%%s$+%%U$+$@$1$G$O$J$/!"?tCM$r(B
$B;XDj=PMh$k$h$&$K$9$k$HJXMx$J$N$G$O$J$$$G$7$g$&$+!#(B