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

Sponsored Content

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..

priyadarshan

View Public Profile for priyadarshan

Find all posts by priyadarshan

9 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

network speed is slow

Hello, everyone: i encounter a problem these days , pls help me ,thanks in advance. my env: machine: ES40 A ES40 B os: true64 Unix 4.0f note: src.tar 8M network card speed 100M my problem: ...

2. AIX

cpu speed

how do i determine the speed of a cpu on AIX 4.3.3 or 5.1?

3. HP-UX

How to find CPU Speed of HP UX

Need to find the CPU speed of HP UX for a non root login. echo "itick_per_usec/D" | adb /stand/vmunix /dev/mem | tail -1 will give the following for non root users ERROR: cannot open `/dev/mem', errno = 13, Permission denied

4. Shell Programming and Scripting

egrep is very slow : How to improve performance

We have an egrep search in a while loop. egrep -w "$key" ${PICKUP_DIR}/new_update >> ${PICKUP_DIR}/update_record_new ${PICKUP_DIR}/new_update is 210 MB file In each iteration, the egrep on an average takes around 50-60 seconds to search. Ther'es nothing significant in the loop other...

5. UNIX for Advanced & Expert Users

speed test +20,000 file existance checks too slow

Need to make a very fast file existence checker. Passing in 20-50K num of files In the code below ${file} is a file with a listing of +20,000 files. test_speed is the script. I am commenting out the results of <time test_speed try>. The normal "test -f" is much much too slow when a system...

6. Shell Programming and Scripting

Help to improve speed of text processing script

Hey together, You should know, that I'am relatively new to shell scripting, so my solution is probably a little awkward. Here is the script: #!/bin/bash live_dir=/var/lib/pokerhands/live for limit in `find $live_dir/ -type d | sed -e s#$live_dir/##`; do cat $live_dir/$limit/*...

7. Red Hat

RHEL 5.6 Slow rsync to NFS array

Hi All, I have RHEL 5.6 with a 70GB local directory of Web content. Images, PHP scripts etc. I need to copy all this content to an NFS array thats mounted on the RHEL server. I did a baseline cp to copy the content one week ago. Since my baseline copy the local directory has grown by 8GB....

8. Shell Programming and Scripting

Slow Perl script: how to speed up?

I had written a perl script to compare two files: new and master and get the output of the first file i.e. the first file: words that are not in the master file STRUCTURE OF THE TWO FILES The first file is a series of names ramesh sushil jonga sudesh lugdi whereas the second file (could be...

9. Shell Programming and Scripting

Improve script - slow process with big files

Gents, Please can u help me to improve this script to be more faster, it works perfectly but for big files take a lot time to end the job.. I see the problem is in the step (while) and in this part the script takes a lot time.. Please if you can find a best way to do will be great. ...

LEARN ABOUT CENTOS

ocf_heartbeat_rsyncd

OCF_HEARTBEAT_RSYNCD(7) 					OCF resource agents					   OCF_HEARTBEAT_RSYNCD(7)

NAME

       ocf_heartbeat_rsyncd - Manages an rsync daemon

SYNOPSIS

       rsyncd [start | stop | monitor | meta-data | validate-all]

DESCRIPTION

       This script manages rsync daemon

SUPPORTED PARAMETERS

       binpath
	   The rsync binary path. For example, "/usr/bin/rsync"

	   (optional, string, default "rsync")

       conffile
	   The rsync daemon configuration file name with full path. For example, "/etc/rsyncd.conf"

	   (optional, string, default "/etc/rsyncd.conf")

       bwlimit
	   This option allows you to specify a maximum transfer rate in kilobytes per second. This option is most effective when using rsync with
	   large files (several megabytes and up). Due to the nature of rsync transfers, blocks of data are sent, then if rsync determines the
	   transfer was too fast, it will wait before sending the next data block. The result is an average transfer rate equaling the specified
	   limit. A value of zero specifies no limit.

	   (optional, string, no default)

SUPPORTED ACTIONS

       This resource agent supports the following actions (operations):

       start
	   Starts the resource. Suggested minimum timeout: 20s.

       stop
	   Stops the resource. Suggested minimum timeout: 20s.

       monitor
	   Performs a detailed status check. Suggested minimum timeout: 20s. Suggested interval: 60s.

       validate-all
	   Performs a validation of the resource configuration. Suggested minimum timeout: 20s.

       meta-data
	   Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5s.

EXAMPLE

       The following is an example configuration for a rsyncd resource using the crm(8) shell:

	   primitive p_rsyncd ocf:heartbeat:rsyncd 
	     op monitor depth="0" timeout="20s" interval="60s"

SEE ALSO

       http://www.linux-ha.org/wiki/rsyncd_(resource_agent)

AUTHOR

       Linux-HA contributors (see the resource agent source for information about individual authors)

resource-agents UNKNOWN 					    06/09/2014						   OCF_HEARTBEAT_RSYNCD(7)