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From: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp>
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At Wed, 29 Oct 2003 15:03:34 +0900,
Kenichi Okuyama wrote:
> $B$$$^!"$U$H;W$C$?$s$G$9$,!#(B
> 
> 
> $B2>A[6u4V(B4Gbyte$B$H$7$F!"$G$O$J$/$F!V2>A[%U%!%$%k$H$7$F!W$J$i$P2DG=$J5$(B
> $B$,!#%U%!%$%k$O(B64bit$B6u4V$r;}$C$F$$$F!"3+;O%*%U%;%C%H$H%5%$%:$r;XDj$9(B
> $B$k$H(B mmap $B$G%^%C%W$G$-$k$8$c$J$$$G$9$+!#(B
> 
> /dev$B$K!"(B4Gbyte$B0J>e$NJ*M}%a%b%j$,I,MW$J?MMQ$N2>A[%G%P%$%9$r:n$C$F!"(B
> $B$=$l$r(B mmap $B$G%^%C%W$9$k!D$H$+$$$&$N$OBLL\$+$7$i!#(B
> 
> $B>/$J$/$H$b(B kernel $B$rBgI}$KJQ99$9$kI,MW$O$J$/$J$k$7!"%3%s%Q%$%i$r2~B$(B
> $B$9$kI,MW$b$J$/$J$k!#$+$o$j$K(B file IO $B$N$h$&$J%"%/%;%9$N;EJ}$r$7$J$/(B
> $B$F$O$$$1$J$$$1$I!#(B

$BJL$K(B, $B2>A[%G%P%$%9:n$i$J$/$F$b(B, file-backed $B$J(B mmap $B$9$l$P$$$$$@$1$@$H(B
$B;W$$$^$9(B. $B;n$7$F$J$$$G$9$,(B, $B86M}E*$K$O(B, 

$BE,Ev$J(B file $B$r(B open(2) $B$7$F(B truncate(2)$B$GE,Ev$JBg$-$5$K$7$?$"$H(B,
unlink(2) $B$7$F$+$i(B, access $B$7$?$$ItJ,$rE,Ev$JBg$-$5$@$1(B, mmap(2) $B$7$F(B,
$BI,MW$J$/$J$C$?$i(B munmap(2) $B$7$F(B,$BB>$NI,MW$JItJ,$r(B mmap(2) $B$7$F(B....

$B$H$$$&46$8$G(B, window $BE*$K;H$&$J$i==J,$@$H;W$$$^$9(B.
unlink(2) $B$9$k$+(B MAP_NOSYNC flag $B$rN)$F$F$*$1$P(B, $B4pK\E*$KJ*M}%a%b%j(B
$B$,M>$C$F$$$k8B$j$O(B, page out $B$5$l$J$$$O$:$J$N$G(B, I/O $B$N(B overhead
$B$O(B, $B$[$H$s$I$J$$$O$:$G$9(B.
($B$H$$$C$F$b(B, page out $B$9$k$H$-$K$O(B, $B$A$g$C$H$$$d$i$7$$LdBj$O$"$C$?$j$7(B
$B$^$9$,(B...$B>\:Y$O(B mmap(2) $B$N(B manpage $B$K=q$$$F$"$k$H;W$$$^$9(B)

$B$C$F$=$N$&$A(B($B;n$7$?$3$H$,$"$k(B)$BC/$+$,=q$/$@$m$&$H;W$C$F$$$?$N$@$1$I(B...

/\ Hidetoshi Shimokawa
\/  simokawa@sat.t.u-tokyo.ac.jp
PGP public key: http://www.sat.t.u-tokyo.ac.jp/~simokawa/pgp.html
