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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LEARN ABOUT DEBIAN
parallel-rsync
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)