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Message-Id: <20000929191524F.simokawa@sat.t.u-tokyo.ac.jp>
Date: Fri, 29 Sep 2000 19:15:24 +0900
From: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp>
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Subject: [FreeBSD-users-jp 55652] Re: read buffer size
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$B0zMQ$,A08e$7$^$9$,(B,

endo> $B$J$s$H$J$/(B OS $B$,8-$$$H;W$&$N$G$"$s$^$j0UL#L5$$$N$+$J$!(B
endo> $B$H$b;W$C$F$$$^$9!#(B
endo> $B$I$J$?$+E*3N$J%"%I%P%$%9$r$*4j$$$$$?$7$^$9!#(Bm(_ _)m

$BE*3N$+$I$&$+$o$+$j$^$;$s$,(B...

$B$^$:(B, $B$I$3$,(B bottle neck $B$K$J$C$F$$$k$+D4$Y$?$[$&$,NI$$$G$7$g$&(B.
systat -vm $B$H$+$9$k$H(B, disk access $B$NMM;R$,$o$+$j$^$9(B.
$B0l2s$N(Btransfer$B$NJ?6Q(B size (KB/t) $B$,>e8B(B(SCSI $B$J$i(B 64KB,
IDE $B$J$i(B 128KB $B$+$J(B)$B$K6a$1$l$P(B, $B4{$K(B $B==J,(B buffering $B$5$l$F$$$k$H(B
$B;W$C$FNI$$$G$7$g$&(B. tps $B$,F,BG$A$K$J$C$F$$$k$h$&$G$7$?$i(B,
disk $B$N(B random access $B$N@-G=$N8B3&$G$7$g$&(B.

$B<+J,$G(B buffering $B$7$F$bNI$$$H$O;W$$$^$9$,(B.
$B$=$3$=$3Bg$-$J(B ($B$G$b?t(BGB$B$h$j>.$5$$(B) file $B$K(B access $B$9$k$N$G$"$l$P(B,
mmap $B$7$F$7$^$C$F(B madvice$B$H$+$G9)IW$9$l$P(B,

endo> $BNc$($P(B 5M $B$N%a%b%j$r3NJ]$7!"$=$3$K%U%!%$%k$r$I$+$C$HFI(B
endo> $B$_9~$`!#$"$H!"$A$^$A$^$H(B 128 $B%P%$%H$E$D$/$i$$%P%C%U%!(B
endo> $B$+$iFI$_=P$7!"=hM}$r9T$$$^$9!#$G!"%G!<%?$,L5$/$J$C$?$i(B
endo> $B$^$?%j!<%I$9$k!#!J6-3&=hM}$,LLE]$/$5$=$&!K(B

$B$H;w$?$h$&$J$3$H$r<j7Z$K<B8=$G$-$k$H;W$$$^$9(B.
128 byte $B$4$H$K(B read syscall $B$rH/9T$9$k$h$j$+$O8zN($,NI$$$G$7$g$&(B.

/\ Hidetoshi Shimokawa
\/  simokawa@sat.t.u-tokyo.ac.jp
PGP public key: finger -l simokawa@sat.t.u-tokyo.ac.jp
