Date: Sat, 17 Feb 2001 16:51:24 -0800 From: "Crist J. Clark" <cjclark@reflexnet.net> To: Cliff Sarginson <cliff@raggedclown.net> Cc: Peter Pentchev <roam@orbitel.bg>, Artem Koutchine <matrix@ipform.ru>, questions@FreeBSD.ORG, security@FreeBSD.ORG Subject: Re: Efficiency [Was: Re: rpc.statd attack] Message-ID: <20010217165124.C62368@rfx-216-196-73-168.users.reflex> In-Reply-To: <E14TmQC-0006Ip-00@post.mail.nl.demon.net>; from cliff@raggedclown.net on Fri, Feb 16, 2001 at 03:03:44PM %2B0000 References: <E14TmQC-0006Ip-00@post.mail.nl.demon.net>
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On Fri, Feb 16, 2001 at 03:03:44PM +0000, Cliff Sarginson wrote:
[snip]
> As you can see makes all the difference :)
> But this is under Solaris ...
>
> $ time rpcinfo -p | egrep -e 'udp.*status$' | awk '{print $4}'
> 32790
>
> real 0m0.12s
> user 0m0.04s
> sys 0m0.07s
>
> $ time rpcinfo -p | awk '($3 == "udp") && ($5 == "status") {print $4 }'
> 32790
>
> real 0m0.11s
> user 0m0.05s
> sys 0m0.04s
Shocking. rpcinfo takes the same amount of time to run in both
examples. You are not incuding the awk's and grep's in your
measurements.
ITYM,
$ rpcinfo -p | time egrep -e 'udp.*status$' | time awk '{print $4}'
996
0.05 real 0.00 user 0.00 sys
0.04 real 0.00 user 0.00 sys
$ rpcinfo -p | time awk '($3 == "udp") && ($5 == "status") {print $4 }'
996
0.03 real 0.00 user 0.00 sys
--
Crist J. Clark cjclark@alum.mit.edu
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