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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
Old 06-02-2018
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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rsync_selinux(8)					rsync Selinux Policy documentation					  rsync_selinux(8)

NAME
rsync_selinux - Security Enhanced Linux Policy for the rsync daemon DESCRIPTION
Security-Enhanced Linux secures the rsync server via flexible mandatory access control. FILE_CONTEXTS SELinux requires files to have an extended attribute to define the file type. Policy governs the access daemons have to these files. If you want to share files using the rsync daemon, you must label the files and directories public_content_t. So if you created a special directory /var/rsync, you would need to label the directory with the chcon tool. chcon -t public_content_t /var/rsync To make this change permanent (survive a relabel), use the semanage command to add the change to file context configuration: semanage fcontext -a -t public_content_t "/var/rsync(/.*)?" This command adds the following entry to /etc/selinux/POLICYTYPE/contexts/files/file_contexts.local: /var/rsync(/.*)? system_u:object_r:publix_content_t:s0 Run the restorecon command to apply the changes: restorecon -R -v /var/rsync/ SHARING FILES
If you want to share files with multiple domains (Apache, FTP, rsync, Samba), you can set a file context of public_content_t and pub- lic_content_rw_t. These context allow any of the above domains to read the content. If you want a particular domain to write to the pub- lic_content_rw_t domain, you must set the appropriate boolean. allow_DOMAIN_anon_write. So for rsync you would execute: setsebool -P allow_rsync_anon_write=1 BOOLEANS
system-config-selinux is a GUI tool available to customize SELinux policy settings. AUTHOR
This manual page was written by Dan Walsh <dwalsh@redhat.com>. SEE ALSO
selinux(8), rsync(1), chcon(1), setsebool(8), semanage(8) dwalsh@redhat.com 17 Jan 2005 rsync_selinux(8)
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