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References: <199701291814.DAA08358@puutalo.geo.titech.ac.jp>
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Date: Thu, 30 Jan 1997 17:15:45 +0900
From: Hideaki Okada <hokada@ipt.isl.melco.co.jp>
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Subject: [FreeBSD-users-jp 9276] Re: performance on numerical calculationdepends on shells?
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>> $B$b$7860x$,(B 8bytes alignment $B$K$"$k$J$i!"(B
>> gcc 2.7.2.1 $B$G(B -malign-double $B$r$D$1$F%3%s%Q%$%k$7$F$_$F$O$I$&$+!"(B
>> $B$H6a$/$N$b$N$,?=$7$F$*$j$^$9!#(B
>> $B$O$$!#(B

$B$3$P$d$7$5$s(B> tcsh% cc -O2 -malign-double -DRUN -DN=20 nbody.c -lm -o nbody
$B$3$P$d$7$5$s(B> tcsh% /usr/bin/time ./nbody
$B$3$P$d$7$5$s(B>       109.19 real       108.92 user         0.05 sys
$B$3$P$d$7$5$s(B> tcsh% bash
$B$3$P$d$7$5$s(B> bash# /usr/bin/time ./nbody
$B$3$P$d$7$5$s(B>        52.55 real        52.43 user         0.02 sys
$B$3$P$d$7$5$s(B> bash# exit
$B$3$P$d$7$5$s(B> exit
$B$3$P$d$7$5$s(B> tcsh% /usr/bin/time ./nbody
$B$3$P$d$7$5$s(B>       108.08 real       107.86 user         0.02 sys
$B$3$P$d$7$5$s(B> tcsh% bash
$B$3$P$d$7$5$s(B> bash# /usr/bin/time ./nbody
$B$3$P$d$7$5$s(B>        54.29 real        54.13 user         0.01 sys

$B$3$P$d$7$5$s(B> $B$H$$$&7k2L$G$9!%(B

$B$3$s$J$K@9$j>e$,$kA0$K!"(Bdouble$B$N%"%i%$%s%a%s%H$8$c$J$$$G$7$g$&$+!)(B $B$H(B
$B=q$$$?$N$G!"$3$N7k2L$O$A$g$C$H0U30$G$7$?!#(B

$B$G!"<j85$K$"$k(B * FreeBSD$B$8$c$J$$(B * pentium$B%^%7%s$G(B gcc 2.7.2 $B$G(B
$B4JC1$J%W%m%0%i%`$r$D$/$C$F%]%$%s%?$NCM$r=P$5$;$?$H$3$m!"(B
8$B%P%$%H$8$c$J$/$C$F(B4$B%P%$%H$G%"%i%$%s%a%s%H$5$l$F$^$7$?!#(B

OS$B$,0c$&$N$G0l35$K$O$$$($^$;$s$,!"%A%'%C%/$7$F$_$F$O$$$+$,$G$7$g$&!#(B
$B!t(B....$B$H$+$$$F$$$?$i!"$=$N$h$&$K%"%I%P%$%9$9$k%a!<%k$,FO$-$^$7$?!#(B

$B$*$+$@(B
