Rsync quite slow (using very little cpu): how to improve its speed? Post: 303018296

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Operating Systems Solaris Rsync quite slow (using very little cpu): how to improve its speed? Post 303018296 by priyadarshan on Saturday 2nd of June 2018 10:05:36 AM

06-02-2018

Registered User

Rsync quite slow (using very little cpu): how to improve its speed?

I have "inherited" a OmniOS (illumos based) server.

I noticed rsync is significantly slower in respect to my reference, FreeBSD 12-CURRENT, running on exactly same hardware.

Using same hardware, same command with same source and target disks, OmniOS r151026 gives:

Code:

test@omniosce:~# time rsync -aPt /zarc/images /home/test/
real    17m25.428s
user    28m33.792s
sys     2m46.217s

In FreeBSD 12-CURRENT:

Code:

 test@freebsd:~ % time rsync -aPt /zarc/images /home/test/

374.651u 464.028s 11:30.63 121.4%    567+210k 791583+780083io 2pf+0w

- I noticed that, under FreeBSD, rsync was running as 3 processes, all with nice=0, two of them consistently using 50% to 70% CPU time.

- On OmniOS rsync was also running as 3 processes, also with nice=0, but each one never more than 3%.

Probably different CPU usage is the reason execution time on same hardware is so different on FreeBSD and illumos?

I tried to renice the rsync process, to -20, with similar results.

I am also aware of priocntl and scheduling classes, but I was unable to change the speed.

How can I improve `rsync` execution time?

Thank you in advance.

Last edited by priyadarshan; 06-02-2018 at 11:22 AM..

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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)