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$B>/$7D4$Y$?$3$H$r=q$$$F$_$k!#(B
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32 $B%S%C%HHG$N(B JavaVM $B$O(B SUN $B$N(B Hotspot VM $B$,(B 2$B%o!<%I(B(8$B%P%$%H(B)$B!"(B IBM VM $B$,(B 3 $B%o!<%I(B(12$B%P%$%H(B)$B$H$J$C$F$$$k(B ( $B$3$3(B$B$r;29M(B)$B!#(B $B
JRockit $B$N%*%V%8%'%/%H%X%C%@%5%$%:$O!"(B SUN Hotspot VM $B$HF1$8(B 2 $B%o!<%I(B(8$B%P%$%H(B) $B$N$h$&$@!#(B
- $B%,!<%Y!<%8%3%l%/%7%g%sJ}<0$O(B 4 $B
JRockit $B$O(B 4$B
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$B%G%U%)%k%H$GA*Br$5$l$k(B GC $B%*%W%7%g%s$O(B -Xmx $B%5%$%:$,(B 128M $BL$K~$J$i(B gencopy$B!"(B 128M $B0J>e$G(B CPU $B?t$,(B 4 $B8DL$K~$J$i(B gencon$B!"(B 128M $B0J>e$G(B CPU $B?t$,(B 4 $B8D0J>e$J$i(B parallel $B$,(B $B;XDj$5$l$k!#(B
$B$3$3$^$G$O%^%K%e%"%k$K$b=q$$$F$"$k$N$G(B OK $B$@$,!"(B $BLdBj$O$3$N(B 4 $B
gencopy $B$H(B gencon $B$O@$BeJL(B GC ($B?7!&5l$N(B2$B@$Be(B) $B$G!"(B singlecon $B$H(B parallel $B$O@$Be$,$J$/(B -Xmx/-Xms $B$G;XDj$5$l$?O"B36u4V$r%U%i%C%H$K;H$&$h$&$G$"$k!#(B
$B@$BeJL(B GC $B$N>l9g(B -Xns $B$G;XDj$7$?%5%$%:$r?7@$Be$N%5%$%:!"(B $B;D$j$r5l@$Be%5%$%:$H$9$k$h$&$@!#(B
$BL5;XDj$N>l9g$N(B $B?7@$Be%5%$%:$O(B GC $B%"%k%4%j%:%`$K$h$C$F8GDj$G!"(B gencopy $B$O(B -Xns640k$B!"(B gencon $B$O(B -Xns16m $B$N$h$&$@!#(B
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$B$7$+$7!"(B gencopy $B$K$*$$$F$O(B -Xns $B$K(B -Xmx $B%5%$%:$NH>J,0J>e$r;XDj$9$k$H%(%i!<$,H/@8$9$k(B (Windows $BHG$N>l9g(B $B%(%i!<%@%$%"%m%0$,I=<($5$l$k(B)$B!#(B
$B$^$?!"(B -Xns $B$N;XDj$rBg$-$/$7$F$$$/$H!"(B $BDL>o$N(B GC $B$,H/@8$7$J$/$J$j!"(B $B6/@)E*$K(B Full GC $B$N$_$K$J$kogCM$,$"$k$h$&$@!#(B-Xmx128m -Xms128m -Xns22m ... GC $B$,5/$3$k(B
-Xmx $B%5%$%:$N(B 1/6 $B$"$?$j$K6-3&$,$"$k$h$&$@!#(B
-Xmx128m -Xms128m -Xns23m ... Full GC $B$7$+5/$-$J$$(B
-Xmx256m -Xms256m -Xns44m ... GC $B$,5/$3$k(B
-Xmx256m -Xms256m -Xns45m ... Full GC $B$7$+5/$-$J$$(B
-Xmx512m -Xms512m -Xns89m ... GC $B$,5/$3$k(B
-Xmx512m -Xms512m -Xns90m ... Full GC $B$7$+5/$-$J$$(B
gencon $B$O(B -Xns $B$,(B -Xms $B%5%$%:$N(B 1/4 $B$K@)8B$5$l$F$$$k$h$&$@!#(B
$B$=$l$h$j$bBg$-$JCM$r@_Dj$9$k$H!"(B $B7Y9p$r=P$7$F;_$^$k!#(B
- $B%7%s!&%9%l%C%I(B(Thin thread)
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$B%M%$%F%#%V%9%l%C%IJ}<0$O(I$(B Java $B%9%l%C%I(B 1 $B$D$KBP$7$F(B OS $B$N%9%l%C%I$r(B 1 $B$D3d$jEv$F$kJ}K!$G!"(B Java $B%9%l%C%I$N%9%1%8%e!<%j%s%0$O(B OS $B$N%9%1%8%e!<%iG$$;$K$J$k!#(B
$B%0%j!<%s%9%l%C%IJ}<0$O!"(B JavaVM $B$NFbIt$N%9%l%C%I$,(B $B%?%$%^!<3d$j9~$_$H(B setjump/longjump $B$r;HMQ$7$J$,$i!"(B Java $B%9%l%C%I$r;~J,3d$G8+$;$kJ}K!$@$C$?!#(B $B%9%1%8%e!<%j%s%0$O(B JavaVM $B$,G$0U$K%3%s%H%m!<%k$G$-$k$,!"(B $B=i4|$N%0%j!<%s%9%l%C%I$O%o!<%+!<%9%l%C%I$,(B 1 $B$D$@$1$@$C$?$N$G!"(B $B%^%k%A(B CPU $B%^%7%s$G$b(B 1 CPU $BJ,$N%Q%o!<$7$+;H$($J$+$C$?!#(B
SUN $B$N(B J2SE $B$NK\N.(B Hotspot VM $B$O!"(B $B7k6I(B $B%0%j!<%s%9%l%C%I$r;_$a$F%M%$%F%#%V%9%l%C%I(B 1$BK\$K$J$C$?!#(B
$B$7$+$7!"(B $BHs>o$KB?$/$N(B Java $B%9%l%C%I$r:n$k(B Java $B%W%m%0%i%`$N>l9g!"(B $B%M%$%F%#%V%9%l%C%I$GF0$+$9$H%j%=!<%9$,B-$i$J$/$J$C$?$j(B $B%9%1%8%e!<%j%s%0$N%*!<%P!<%X%C%I$,LdBj$K$J$k$N$G$"$k!#(B
$B$=$3$G=P$F$-$?(B Thin thread$B!#(B $B%^%k%A(B CPU $B$GF0:n$9$k%0%j!<%s%9%l%C%I$G$"$k!#(B
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$B$G!"(B $B
- Thread-Local Allocation
$B$3$l$O(B SUN Hotspot VM $B$N(B UseTLE $B$d!"(B IBM VM $B$N(B cache allocation $B$HF1$8$b$N$N$h$&$K8+$($k!#(B - $B%,!<%Y!<%8%3%l%/%7%g%sJ}<0$O(B 4 $B
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TOP
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Written by NAKAMURA Minoru, Email: nminoru atmark nminoru dot jp, Twitter:@nminoru_jp