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Full Discussion: Break up file into n number of subsets and run in parallel
Top Forums Shell Programming and Scripting Break up file into n number of subsets and run in parallel Post 302890776 by gina.lizar on Friday 28th of February 2014 01:20:06 PM
Old 02-28-2014
Break up file into n number of subsets and run in parallel
Hi Guys,

I want to break down one of my input files into say 25 parts , run the same script in parallel and then merge the output into a single script.
I have access to computing resources that can deal with 25 files, if I just run the original file the total time is about 15 days every time.

Is this possible? So if I have an awk script gina.awk, these would be the steps.

1. Split Input.file into Input1.file, Input2.file,....Input25.file

2.
Code:
for file in Input*
do
./gina.awk $file > out_$file
done

3.
Code:
cat out* > Output.file

Is this possible? and will it help my cause in speeding up? I have access to 25 CPU cores.
Last edited by bartus11; 02-28-2014 at 02:44 PM.. Reason: Please use [code][/code] tags.
 

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LEARN ABOUT OPENSOLARIS

startpar

STARTPAR(8)						      System Manager's Manual						       STARTPAR(8)

NAME

       startpar - start runlevel scripts in parallel

SYNOPSIS

       startpar [-p par] [-i iorate] [-t timeout] [-T global_timeout] [-a arg] prg1 prg2 ...
       startpar [-p par] [-i iorate] [-t timeout] [-T global_timeout] -M [ boot|start|stop]

DESCRIPTION

       startpar  is  used  to run multiple run-level scripts in parallel.  The degree of parallelism on one CPU can be set with the -p option, the
       default is full parallelism. An argument to all of the scripts can be provided with the -a option.  Processes blocked by pending  I/O  will
       cause  new  process  creation  to be weighted by the iorate factor 800.	To change this factor the option -i can be used to specify another
       value.  The amount weight=(nblockedxiorate)/1000 will be subtracted from the total number  of  processes  which	could  be  started,  where
       nblocked is the number of processes currently blocked by pending I/O.

       The  output  of	each  script is buffered and written when the script exits, so output lines of different scripts won't mix. You can modify
       this behaviour by setting a timeout.

       The timeout set with the -t option is used as buffer timeout. If the output buffer of a script is not empty and the last output was timeout
       seconds ago, startpar will flush the buffer.

       The  -T option timeout works more globally. If no output is printed for more than global_timeout seconds, startpar will flush the buffer of
       the script with the oldest output. Afterwards it will only print output of this script until it is finished.

       The -M option switches startpar into a make(1) like behaviour.  This option takes three different arguments:  boot,  start,  and  stop  for
       reading .depend.boot or .depend.start or .depend.stop respectively in the directory /etc/init.d/.  By scanning the boot and runlevel direc-
       tories in /etc/init.d/ it then executes the appropriate scripts in parallel.

FILES

       /etc/init.d/.depend.boot
       /etc/init.d/.depend.start
       /etc/init.d/.depend.stop

SEE ALSO

       init(8) insserv(8).

COPYRIGHT

       2003,2004 SuSE Linux AG, Nuernberg, Germany.
       2007 SuSE LINUX Products GmbH, Nuernberg, Germany.

AUTHOR

       Michael Schroeder <mls@suse.de>
       Takashi Iwai <tiwai@suse.de>
       Werner Fink <werner@suse.de>

								     Jun 2003							       STARTPAR(8)
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