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Operating Systems Linux Inconsistency with parallel run Post 303006258 by arunkumar_mca on Monday 30th of October 2017 11:31:55 AM
Old 10-30-2017
Inconsistency with parallel run

Hi All,

I am running a parallel processing on aggregating a file. I am splitting the process into 7 separate parallel process and processing the same input file and the process will do the same for each 7 run. The issue I am having is for some reason the 1st parallel processes complete first with minimum time and the second complete as second and so on. Each process completion having significant difference in time.

I tried to look CPU usage when process with top command all the process is occupying 97% of CPU not sure why there is a difference between each parallel run.

Is there a way I can trace the process and find whether it is problem with IO/ Memory or CPU.

Note: Each process will read the same file from NAS mount and do the aggregation. I am using RedHAT

Thanks
Arun
 

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PARALLEL-RSYNC(1)														 PARALLEL-RSYNC(1)

NAME
parallel-rsync - deploy files to listed hosts SYNOPSIS
parallel-rsync [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-rsync deploy files files to all hosts you listed. OPTIONS
-r --recursive recusively copy directories (OPTIONAL) -a ----archive use rsync -a (archive mode) (OPTIONAL) -z --compress use rsync compression (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
# parallel-rsync -r -h hosts.txt -l irb2 foo /home/irb2/foo 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-scp(1), parallel-slurp(1), parallel-nuke(1), ssh(1), rsync(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-RSYNC(1)
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