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Full Discussion: Monitoring processes in parallel and process log file after process exits
Top Forums Shell Programming and Scripting Monitoring processes in parallel and process log file after process exits Post 303003294 by shunya on Tuesday 12th of September 2017 12:42:53 AM
Old 09-12-2017
Monitoring processes in parallel and process log file after process exits
I am writing a script to kick off a process to gather logs on multiple nodes in parallel using "&". These processes create individual log files. Which I would like to filter and convert in CSV format after they are complete. I am facing following issues:
1. Monitor all Processes parallelly. whichever process completes first I would like to convert o/p log file of corresponding process to csv format. Sometimes process might take more than 30 mins to complete. Problem with my code is it will go serially converting files and not any process which completes or releases the file first. Please help

I have following code
Code:
#!/bin/sh -x

infile="$1"
PWD=`pwd`
shift
exec 2>&1
for IPADD in `cat $infile|awk '{print $1}' |tr -d '\015'`
do
OPFILE=${IPADD}_syslog.txt
nohup ${PWD}/collect_log.sh $IPADD > ${OPFILE} &
DPID=$!
echo -e "$DPID $OPFILE" >> pid_pfile.txt
done

##### Loop to parse and rename the files after data collection is complete.
check_palive()
{
PALIVE=`ps cax | grep $DPID | grep -o '^[ ]*[0-9]*'`
if [ -z $PALIVE ];then
HNAME=`grep -i hostname |awk '{print $NF}'`
awk '/name/,/exit/'  $OPFILE |head -n -1 |awk '{print $1,$2,$3,$4,$5}'> ${HNAME}.txt
fi
}


PCOUNT=`pgrep collect_log.sh |wc -l`

while [ $PCOUNT -gt 0 ];do

      for DPID in `pgrep collect_log.sh |awk '{print $1}'`
       do

       PALIVE=`ps -p $DPID --no-headers | wc -l`
          if [ $PALIVE == 0 ];then
            wait $DPID
            OPFILE=`grep $DPID pid_pfile.txt|awk '{print $2}'`
            check_palive
           # sed "/$DPID/d" pid_pfile.txt > pid_pfile.txt
        else
          sleep 120
       fi
done

PCOUNT=`pgrep "junk" |wc -l`
done
rm -f pid_pfile.txt

---------- Post updated at 11:42 PM ---------- Previous update was at 11:38 PM ----------

$infile has list of IP addresses of nodes.
 

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LEARN ABOUT X11R4

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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