Making use of multiple cores for running sed and awk scripts
Hi All,
After reading that the sort command in Linux can be made to use many processor cores just by using a simple script which I found on the internet, I was wondering if I can use similar techniques for programs like the awk and sed?
Code:
#!/bin/bash
# Usage: psort filename <chunksize> <threads>
# In this example a the file largefile is split into chunks of 20 MB.
# The part are sorted in 4 simultaneous threads before getting merged.
#
# psort largefile.txt 20m 4
#
# by h.p.
split -b $2 $1 $1.part
suffix=sorttemp.`date +%s`
nthreads=$3
i=0
for fname in `ls *$1.part*`
do
let i++
sort $fname > $fname.$suffix &
mres=$(($i % $nthreads))
test "$mres" -eq 0 && wait
done
wait
sort -m *.$suffix
rm $1.part*
Previously, I used to use sort without using the above script and it used to take several minutes to sort a very large file. By default sort command only uses one core of the processor.
My school has just purchased a 16 core server with Linux and 96 GB RAM, so I am currently fiddling with it.
Now, a thought comes to my mind: Can sed and awk be used in the same way so that they make use of all the 16 cores of the processor?
I ask this because once I tried to fiddle with a huge Wikipedia file dump which I downloaded from the internet. The XML file is 30 GB in size and contains some 3.5 million articles.
I then ran this script in order to parse the individual articles and store them in separate files:
Code:
awk '/<page>/{c++}{print > c ".dat"}' wikipedia_dump.xml
To my horror, it took about 10-12 days to complete the task. I am wondering, if it is possible to use awk in such a way that it could use all the cores of the processor and run in a multi-threaded fashion? I ran the above awk script on the same new server running Linux.
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I have created 3 shell scripts which has to run one by one first two shell scripts will create a .txt files...which are used by the third shell script.Now I want to create a master script and run all these in a single script.
Please give a pseudo code on how to so the same.
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uid,givenname,sn,cn,mail,telephonenumber
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Hi, I was hoping that someone could help me. I have a problem that i am trying to work on and it requires me to change text within multiple files using sed. I use the program to change an occurance of a word throughout different files that are being tested. At first i had to Create a new script,... (1 Reply)
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Hi
I probably dont have GNU extended sed in my SUNOS . and its creating lot of problems
ex:
a simple sed command like this is not working
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Hi Team,
I have the below 4 scripts which I will be running in sequential order.
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Hello!
I have a scriptA.ksh and in this script I need to call script1.ksh, script2.ksh, script3.ksh, script4.ksh and script5.ksh. But want to run in two batches like
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Discussion started by: karumudi7
1 Replies
LEARN ABOUT DEBIAN
lr_environment
LR_ENVIRONMENT.IN(1) LogReport's Lire Documentation LR_ENVIRONMENT.IN(1)NAME
lr_environment - Export Lire configuration in shell script form
SYNOPSIS
eval `lr_environment`
DESCRIPTION
The lr_environment command is used to import the Lire configuration in Lire shell scripts.
All of Lire configuration variables will be written in a format that can be evaled by the shell.
Shell scripts don't usually have to use that command, since it is done by the defaults file sourced by each command.
The old names used by when the configuration was done in shell script are also exported by this script for backward compatibility.
AUTHOR
Francis J. Lacoste <flacoste@logreport.org>
VERSION
$Id: lr_environment.in,v 1.12 2006/07/23 13:16:33 vanbaal Exp $
COPYRIGHT
Copyright (C) 2003 Stichting LogReport Foundation LogReport@LogReport.org
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program (see COPYING); if not, check with
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Lire 2.1.1 2006-07-23 LR_ENVIRONMENT.IN(1)
08-20-2011
