Sar
From Linuxintro
sar allows you to monitor your computer resources' usage over a time frame.
Contents
Use it
To install and use sar find out your distribution and proceed accordingly:
Ubuntu 10.04
- to install, open a console and enter
sudo apt-get install sysstat /etc/init.d/sysstat start
- after a day you will find statistics in /var/log/sysstat. You can look at these using kSar.
Examples
CPU statistics
tweedleburg:~ # sar 10 Linux 2.6.32.12-0.7-default (tweedleburg) 12/05/2010 _x86_64_ 05:05:02 AM CPU %user %nice %system %iowait %steal %idle 05:05:12 AM all 7.16 0.00 0.79 0.00 0.00 92.04 05:05:22 AM all 7.05 0.00 0.77 0.02 0.00 92.16
network and ram
The following collects data for RAM (-r) and network (-n) all 10 seconds
tweedleburg:~ # sar -r -n DEV 10 Linux 2.6.32.12-0.7-default (tweedleburg) 12/05/2010 _x86_64_ 05:23:09 AM kbmemfree kbmemused %memused kbbuffers kbcached kbcommit %commit 05:23:19 AM 42832588 6586776 13.33 284956 3922980 1816792 3.68 05:23:09 AM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s 05:23:19 AM lo 1.51 1.51 0.18 0.18 0.00 0.00 0.00 05:23:19 AM eth0 37.10 1.71 3.51 0.25 0.00 0.00 0.00 05:23:19 AM eth1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 05:23:19 AM eth2 24.70 17.94 3.59 2.80 0.00 0.00 0.10 05:23:19 AM eth3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 05:23:19 AM kbmemfree kbmemused %memused kbbuffers kbcached kbcommit %commit 05:23:29 AM 42828780 6590584 13.34 284964 3922980 1820588 3.68 05:23:19 AM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s 05:23:29 AM lo 2.05 2.05 0.21 0.21 0.00 0.00 0.00 05:23:29 AM eth0 40.02 6.46 3.87 6.09 0.00 0.00 0.00 05:23:29 AM eth1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 05:23:29 AM eth2 17.03 9.78 2.14 1.53 0.00 0.00 0.10 05:23:29 AM eth3 0.00 0.00 0.00 0.00 0.00 0.00 0.00
TroubleShooting
If you get
# sar -q Cannot open /var/log/sa/sa29: No such file or directory Please check if data collecting is enabled
Just run
/usr/lib64/sa/sa1
