Achive "NOT RUN PARALLEL" Post: 302880948

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Top Forums Shell Programming and Scripting Achive "NOT RUN PARALLEL" Post 302880948 by Don Cragun on Wednesday 25th of December 2013 12:47:15 AM

12-25-2013

Registered User

You could write a script that will run the other SB, SA, SC, and SD guaranteeing that SA completes before SC and SD start, allowing SB, SC, and SD to run in parallel, and guaranteeing that only one copy of the script runs at a time without modifying SA, SB, SC, or SD. One way to do this is:

Code:

#!/bin/ksh
# The following cd command must specify an absolute pathname to run it from cron.
cd '/directory/where/this/script/should/run'
IAm=${0##*/}
Lock="$IAm.lock"
set -C  # Generate error if redirection target exists.
# Create lock file, if it does not exist...
if ! date "+$IAm started %x at %X with PID $$" > "$Lock"
then    # Exit if the lock file already existed...
        printf "%s: Error: Another copy of this script is already running.\n" \
                "$IAm" >&2
        cat "$Lock" >&2
        exit 1
fi
trap 'rm -f "$Lock"' 0    # Set trap to remove the lock file on exit.
set +C
./SB&           # Start SB
./SA&           # Start SA
SApid=$!        # Get pid of SA
wait $SApid     # wait for SA to finish
./SC& ./SD&     # Start SC and SD
wait            # wait for SB, SC, and SD to finish

Note that when started by cron, your environment will not be initialized as it would be if you had logged in and started it from your shell. If SA, SB, SC, and SD need to have any environment variables set, you will need to set those variables in the start of this script before they are invoked.

This script exits if another copy of the script is still running. If you want it to enter an idle loop until the prior script completes, you can replace the if, then, else with a while, do, done and the exit with a sleep.

This script was tested with both ksh and bash. The way it sets $IAm will not work with an original Bourne shell. (There may also be other standard features used by this script that the Bourne shell does not support.)

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LEARN ABOUT DEBIAN

parallel-scp

PARALLEL-SCP(1) 														   PARALLEL-SCP(1)

NAME

       parallel-scp - parallel versions of scp

SYNOPSIS

       parallel-scp [OPTIONS] -h hosts.txt local remote

DESCRIPTION

       pssh provides a number of commands for executing against a group of computers, using SSH. It's most useful for operating on clusters of
       homogenously-configured hosts.

       parallel-scp copy files in parallel to a set of machines.

OPTIONS

       -r --recursive
	   recusively copy directories (OPTIONAL)

       -h --hosts
	   hosts file (each line "host[:port] [user]")

       -l --user
	   username (OPTIONAL)

       -p --par
	   max number of parallel threads (OPTIONAL)

       -o --outdir
	   output directory for stdout files (OPTIONAL)

       -e --errdir
	   output directory for stderr files (OPTIONAL)

       -t --timeout
	   timeout (secs) (-1 = no timeout) per host (OPTIONAL)

       -O --options
	   SSH options (OPTIONAL)

       -v --verbose
	   turn on warning and diagnostic messages (OPTIONAL)

EXAMPLE

       The following example runs hostname on three machines (IPs or hostnames) specified in the file ips.txt using login irb2 and saves the
       output in /tmp/foo.

	   # parallel-scp -h ips.txt -l irb2 /etc/hosts /tmp/hosts
	   Success on 128.112.152.122:22
	   Success on 18.31.0.190:22
	   Success on 128.232.103.201:22

ENVIRONMENT

       All four programs take similar sets of options. All of these options can be set using the following environment variables:

       o   PSSH_HOSTS
       o   PSSH_USER
       o   PSSH_PAR
       o   PSSH_OUTDIR
       o   PSSH_VERBOSE
       o   PSSH_OPTIONS

SEE ALSO

       parallel-ssh(1), parallel-slurp(1), parallel-nuke(1), parallel-rsync(1), ssh(1), scp(1),

AUTHOR

       Brent N. Chun <bnc@theether.org>

COPYING

       Copyright: 2003, 2004, 2005, 2006, 2007 Brent N. Chun

NOTES

	1. bnc@theether.org
	   mailto:bnc@theether.org

								    03/30/2009							   PARALLEL-SCP(1)