Time taken to run grep in different OS Post: 302835801

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Top Forums Shell Programming and Scripting Time taken to run grep in different OS Post 302835801 by millan on Tuesday 23rd of July 2013 03:18:12 AM

07-23-2013

Registered User

Time taken to run grep in different OS

Hi ,

I am greping a keyword in all sql files in Solaris and Linux.

Solaris

Code:

 
bash-3.00$  time grep -iwc BEN_STARTUP_LERS_TL084701_WHO *.sql
Load__v20130719-prod.sql:0
Load__v20130719-prod.sql:0
Load__v20130719-prod.sql:0
Load__v20130719-prod.sql:0
Load__v20130719-prod.sql:0
Load__v20130719-prod.sql:0
real    0m0.640s
user    0m0.564s
sys     0m0.077s

Linux

Code:

 
[Sql]$ time grep -iwc BEN_STARTUP_LERS_TL084701_WHO *.sql
Load__v20130719-prod.sql:0
Load__v20130719-prod.sql:0
Load__v20130719-prod.sql:0
Load__v20130719-prod.sql:0
Load__v20130719-prod.sql:0
real    0m2.518s
user    0m2.499s
sys     0m0.013s

If you see in solaris it is taking less than one second where as in linux it is taking more than 2 sec to execute the same command.

Infact my aim is to reduce the time taken by this command as less as possible may be a littile fraction of a second because i have around 50k keywords to search..

Can anyone please advice how to reduce the execution time.

millan

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LEARN ABOUT LINUX

bzfgrep

BZGREP(1)						      General Commands Manual							 BZGREP(1)

NAME

       bzgrep, bzfgrep, bzegrep - search possibly bzip2 compressed files for a regular expression

SYNOPSIS

       bzgrep [ grep_options ] [ -e ] pattern filename...
       bzegrep [ egrep_options ] [ -e ] pattern filename...
       bzfgrep [ fgrep_options ] [ -e ] pattern filename...

DESCRIPTION

       Bzgrep  is  used to invoke the grep on bzip2-compressed files. All options specified are passed directly to grep.  If no file is specified,
       then the standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and  fed	to
       grep.

       If  bzgrep  is  invoked as bzegrep or bzfgrep then egrep or fgrep is used instead of grep.  If the GREP environment variable is set, bzgrep
       uses it as the grep program to be invoked. For example:

	   for sh:  GREP=fgrep	bzgrep string files
	   for csh: (setenv GREP fgrep; bzgrep string files)

AUTHOR

       Charles Levert (charles@comm.polymtl.ca). Adapted to bzip2 by Philippe Troin <phil@fifi.org> for Debian GNU/Linux.

SEE ALSO

       grep(1), egrep(1), fgrep(1), bzdiff(1), bzmore(1), bzless(1), bzip2(1)

																	 BZGREP(1)

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