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To: FreeBSD-users-jp@jp.freebsd.org
From: hino@ccm.cl.nec.co.jp
In-Reply-To: mino@bb.imagica.co.jp's message of "Thu, 14 May 1998 16:16:44 +0900
	 (JST)"
References: <199805140716.QAA14068@serv1.hq.imagica.co.jp>
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Date: Thu, 14 May 1998 18:05:11 +0900
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$BF|Ln(B@NEC$B$G$9!%(B

>> On Thu, 14 May 1998 16:16:44 +0900 (JST), Minoru Oikawa
>> <mino@bb.imagica.co.jp> said:
:>  $B$+$o$$(B@$B%-%d%N%s$5$s$N$^$M$7$F!"$D$/$C$F$_$?$G$U!#(B

$B;d$b(B (^^)

:>  $B$H$j$"$($:7j$OL5$$$_$?$$$G$9$1$I$M!D$C$F>C$7$A$c$C$?(B(^.^)

$BFI$s$G$_$^$7$?!%(B

# dd if=/dev/zero of=zero bs=1m count=4800
4800+0 records in
4800+0 records out
738197504 bytes transferred in 499.806291 secs (1476967 bytes/sec)

# ls -l
total 4917608
-rw-r--r--  1 root  xxxx  5033164800 May 14 16:43 zero

# dd if=zero of=/dev/null bs=1m
4800+0 records in
4800+0 records out
738197504 bytes transferred in 601.206884 secs (1227859 bytes/sec)

$B!s(B $B$J$s$G(Bread$B$NJ}$,CY$$$s$@$m(B?

# time cat zero > /dev/null
0.189u 63.946s 9:53.80 10.7%    56+270k 77251+58io 0pf+0w

# time grep A zero
grep: memory exhausted
2.038u 2.370s 0:45.19 9.7%      50+105614k 1191+1io 1901pf+0w

$B!s(B grep$B$O!$$+$o$$!w$-$d$N$s(B $B$5$s$N=q$$$?DL$j$G$9$M!%HO0O%A%'%C%/L5$7$G(B
$B!s(B $BA4It(Bmmap$B$7$F$k$N$+$J(B?

# time hexdump zero
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
12c000000
322.797u 61.063s 11:25.14 56.0% 20+281k 77262+31io 3pf+0w

$B!s(B 16$B?J?t$G(B9$B7e$+$!!D(B $B<B46$,M/$+$J$$$N$G0l1~(Bbc$B$G%A%'%C%/(B (^^;

# bc
bc 1.03 (Nov 2, 1994)
Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'.
ibase=16
12C000000
5033164800
#

$B<!$OCf?H$N$"$k%U%!%$%k$G%A%'%C%/$+$J(B?
==========================================
$BF|Ln9@;V(B($B$R$N$3$&$8(B)@NEC C&C$B%a%G%#%"8&5f=j(B
		     hino@ccm.CL.nec.co.jp

