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Full Discussion: cat command
Operating Systems AIX cat command Post 302453510 by Corona688 on Wednesday 15th of September 2010 01:48:32 PM
Old 09-15-2010
Quote:
Originally Posted by methyl
Both these assumptions do not stand up to benchmark testing except perhaps on the first use of "cat" after a clean boot.
Don't be ridiculous.
Code:
$ time for ((N=0; N<10000; N++)) ; do cat config | grep 32 > /dev/null ; done

real    0m21.712s
user    0m7.800s
sys     0m14.561s
$ time for ((N=0; N<10000; N++)) ; do grep 32 < config > /dev/null ; done

real    0m14.115s
user    0m5.932s
sys     0m9.381s
$

...and this is on a dual-core system. If grep had to time-share with cat, the performance would be worse yet. There is of course a cost in resources and time to launching a process and piping data through it, especially for small amounts of data. It's only insignificant when you do it once.
Last edited by Corona688; 09-15-2010 at 02:58 PM..
 

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LEARN ABOUT CENTOS

dbd::gofer::transport::null

DBD::Gofer::Transport::null(3)				User Contributed Perl Documentation			    DBD::Gofer::Transport::null(3)

NAME

       DBD::Gofer::Transport::null - DBD::Gofer client transport for testing

SYNOPSIS

	 my $original_dsn = "..."
	 DBI->connect("dbi:Gofer:transport=null;dsn=$original_dsn",...)

       or, enable by setting the DBI_AUTOPROXY environment variable:

	 export DBI_AUTOPROXY="dbi:Gofer:transport=null"

DESCRIPTION

       Connect via DBD::Gofer but execute the requests within the same process.

       This is a quick and simple way to test applications for compatibility with the (few) restrictions that DBD::Gofer imposes.

       It also provides a simple, portable way for the DBI test suite to be used to test DBD::Gofer on all platforms with no setup.

       Also, by measuring the difference in performance between normal connections and connections via "dbi:Gofer:transport=null" the basic cost
       of using DBD::Gofer can be measured. Furthermore, the additional cost of more advanced transports can be isolated by comparing their
       performance with the null transport.

       The "t/85gofer.t" script in the DBI distribution includes a comparative benchmark.

AUTHOR

       Tim Bunce, <http://www.tim.bunce.name>

LICENCE AND COPYRIGHT

       Copyright (c) 2007, Tim Bunce, Ireland. All rights reserved.

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.

SEE ALSO

       DBD::Gofer::Transport::Base

       DBD::Gofer

perl v5.16.3							    2013-04-04					    DBD::Gofer::Transport::null(3)
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