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Full Discussion: concurrent processes
Top Forums Shell Programming and Scripting concurrent processes Post 302113991 by matrixmadhan on Wednesday 11th of April 2007 11:32:47 PM
Old 04-12-2007
Quote:
Originally Posted by Amruta Pitkar
Hi MatrixMadhan,

I am not sure how to code this exactly....
Also..from what I read...do I have to stop the background processes explicitly..
What if there are some problems with the data parsing...how will the error.log will be created...
Can u explain more, guide for some sample scripts ?

There is no need to stop your background process unless they is a situation to be done so!

would something like this be of help!

split the files ...100k to 10 ( 10k s )
now the process that was used to run against the 100k sample, should be used against each of the smaller chunks

i=1
while[ $i -le 10 ]
do
/somedir/process chunk$i & //Make that a background process
i=$(($i + 1))
done

Now with the above loop, smaller chunks are fed to the individual process and would start processing.

By default background process have a lower priority when compared to the foreground process.

You need to arrive / determine at a threshold value ( more of a bench mark stuff ) where running several processes with smaller chunks is actually not bringing down the performance when compared to running it with a single chunk and just a single process.

Creating the error logs is as the usual way as you had been doing it for the foreground process!

Smilie
 

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wait(1) 						      General Commands Manual							   wait(1)

NAME
wait - await process completion SYNOPSIS
[pid] DESCRIPTION
If no argument is specified, waits until all processes (started with of the current shell have completed, and reports on abnormal termina- tions. If a numeric argument pid is given and is the process ID of a background process, waits until that process has completed. Other- wise, if pid is not a background process, exits without waiting for any processes to complete. Because the system call must be executed in the parent process, the shell itself executes without creating a new process (see wait(2)). Command-Line Arguments supports the following command line arguments: The unsigned decimal integer process ID of a command, whose termination is to wait for. WARNINGS
Some processes in a 2-or-more-stage pipeline may not be children of the shell, and thus cannot be waited for. SEE ALSO
csh(1), ksh(1), sh-posix(1), sh(1), wait(2). STANDARDS CONFORMANCE
wait(1)
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