Sysstat
Installation
_$: apt-get install sysstat
Configuration
/etc/default/sysstat:
---------------------
#
# Default settings for /etc/init.d/sysstat, /etc/cron.d/sysstat
# and /etc/cron.daily/sysstat files
#
# Should sadc collect system activity informations? Valid values
# are "true" and "false". Please do not put other values, they
# will be overwritten by debconf!
ENABLED="true" <===
# Additional options passed to sa1 by /etc/init.d/sysstat
# and /etc/cron.d/sysstat
# By default contains the `-S DISK' option responsible for
# generating disk statisitcs.
SA1_OPTIONS="-S DISK"
### To monitor disk and temperature
### SA1_OPTIONS="-S DISK -S POWER"
# Additional options passed to sa2 by /etc/cron.daily/sysstat.
SA2_OPTIONS=""
/etc/sysstat/sysstat:
---------------------
# sysstat configuration file.
# How long to keep log files (in days).
# Used by sa2(8) script
# If value is greater than 28, then log files are kept in
# multiple directories, one for each month.
HISTORY=28 <===
# Compress (using gzip or bzip2) sa and sar files older than (in days):
COMPRESSAFTER=14 <===
# Parameters for the system activity data collector (see sadc manual page)
# which are used for the generation of log files.
SADC_OPTIONS=""
_$: service sysstat start
Check
Let’s say that we are on day 9 of this month.
_$: cd /var/log/sysstat
_$: ls -l
total 4
-rw-r--r-- 1 root root 656 May 9 18:20 sa09
_$: sar -u 2 5
Linux 3.5.0-49-generic (dceresuela-nix) 05/09/2014 _x86_64_ (8 CPU)
06:25:48 PM CPU %user %nice %system %iowait %steal %idle
06:25:50 PM all 0.00 0.00 0.25 0.00 0.00 99.75
06:25:52 PM all 0.25 0.00 0.00 0.00 0.00 99.75
06:25:54 PM all 0.00 0.00 0.25 0.00 0.00 99.75
06:25:56 PM all 0.25 0.00 0.25 0.00 0.00 99.50
06:25:58 PM all 0.25 0.00 0.00 0.00 0.00 99.75
Average: all 0.15 0.00 0.15 0.00 0.00 99.70
The average time between samples are 10 minutes, so after at least 10 minutes have passed, we can check the data collected:
_$: sar -u
Linux 3.5.0-49-generic (dceresuela-nix) 05/09/2014 _x86_64_ (8 CPU)
09:02:19 AM LINUX RESTART
09:05:01 AM CPU %user %nice %system %iowait %steal %idle
09:15:01 AM all 0.81 0.00 0.31 0.38 0.00 98.51
09:25:01 AM all 0.50 0.00 0.27 0.22 0.00 99.01
09:35:01 AM all 0.62 0.00 0.36 0.20 0.00 98.82
09:45:01 AM all 1.16 0.00 0.50 0.23 0.00 98.11
09:55:01 AM all 0.53 0.00 0.29 0.19 0.00 98.99
10:05:01 AM all 0.33 0.00 0.21 0.08 0.00 99.38
10:15:01 AM all 0.33 0.00 0.21 0.10 0.00 99.36
10:25:01 AM all 0.43 0.00 0.26 0.15 0.00 99.16
10:35:01 AM all 0.75 0.00 0.47 0.15 0.00 98.62
10:45:01 AM all 0.67 0.00 0.35 0.18 0.00 98.80
10:55:01 AM all 0.58 0.00 0.32 0.15 0.00 98.94
11:05:01 AM all 0.87 0.00 0.39 0.19 0.00 98.56
11:15:01 AM all 0.53 0.00 0.31 0.20 0.00 98.96
11:25:01 AM all 0.96 0.00 0.46 0.20 0.00 98.38
_$: sar -s 09:10:00 -e 10:10:00
Linux 3.8.0-29-generic (tux) 05/09/2014 _x86_64_ (4 CPU)
09:15:01 AM CPU %user %nice %system %iowait %steal %idle
09:25:01 AM all 0.58 0.00 1.89 0.49 0.00 97.04
09:35:01 AM all 0.57 0.00 2.08 0.48 0.00 96.87
09:45:01 AM all 0.57 0.00 1.95 0.46 0.00 97.02
09:55:01 AM all 0.57 0.00 2.01 0.54 0.00 96.88
10:05:01 AM all 0.57 0.00 2.09 0.55 0.00 96.79
Average: all 0.57 0.00 2.00 0.50 0.00 96.92
_$: sar -m TEMP 2 5
Linux 3.8.0-29-generic (hal) 06/18/2014 _x86_64_ (2 CPU)
12:29:20 PM TEMP degC %temp DEVICE
12:29:22 PM 1 36.00 46.15 coretemp-isa-0000
12:29:22 PM 2 40.00 51.28 coretemp-isa-0000
12:29:22 PM TEMP degC %temp DEVICE
12:29:24 PM 1 36.00 46.15 coretemp-isa-0000
12:29:24 PM 2 40.00 51.28 coretemp-isa-0000
12:29:24 PM TEMP degC %temp DEVICE
12:29:26 PM 1 36.00 46.15 coretemp-isa-0000
12:29:26 PM 2 40.00 51.28 coretemp-isa-0000
12:29:26 PM TEMP degC %temp DEVICE
12:29:28 PM 1 36.00 46.15 coretemp-isa-0000
12:29:28 PM 2 40.00 51.28 coretemp-isa-0000
12:29:28 PM TEMP degC %temp DEVICE
12:29:30 PM 1 36.00 46.15 coretemp-isa-0000
12:29:30 PM 2 40.00 51.28 coretemp-isa-0000
Average: TEMP degC %temp DEVICE
Average: 1 36.00 46.15 coretemp-isa-0000
Average: 2 40.00 51.28 coretemp-isa-0000
_$: sar -n DEV -s 10:00:00 -e 13:15:00 | grep -E "IFACE|[^\.]wlan0"
10:05:01 AM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s
10:15:01 AM wlan0 28.78 63.37 2.18 92.85 0.00 0.00 0.00
10:25:01 AM wlan0 3.86 5.43 0.33 6.90 0.00 0.00 0.00
10:35:01 AM wlan0 8.68 21.52 0.88 29.77 0.00 0.00 0.00
10:45:01 AM wlan0 3.10 2.79 0.47 2.04 0.00 0.00 0.00
10:55:01 AM wlan0 0.51 0.43 0.06 0.07 0.00 0.00 0.00
11:05:01 AM wlan0 0.68 0.57 0.13 0.12 0.00 0.00 0.00
11:15:01 AM wlan0 1.14 0.93 0.20 0.39 0.00 0.00 0.00
11:25:01 AM wlan0 0.62 0.49 0.09 0.14 0.00 0.00 0.00
11:35:01 AM wlan0 3.16 3.65 0.48 3.44 0.00 0.00 0.00
11:45:01 AM wlan0 0.78 1.26 0.12 0.58 0.00 0.00 0.00
11:55:01 AM wlan0 1.15 1.03 0.20 0.40 0.00 0.00 0.00
12:05:01 PM wlan0 1.02 0.87 0.14 0.28 0.00 0.00 0.00
12:15:01 PM wlan0 0.65 0.62 0.12 0.23 0.00 0.00 0.00
12:25:01 PM wlan0 0.61 0.50 0.07 0.19 0.00 0.00 0.00
12:35:01 PM wlan0 4.12 3.72 0.50 0.62 0.00 0.00 0.00
12:45:01 PM wlan0 2.89 2.52 0.51 0.42 0.00 0.00 0.00
12:55:01 PM wlan0 3.89 3.22 0.79 0.69 0.00 0.00 0.00
Average: wlan0 3.86 6.64 0.43 8.18 0.00 0.00 0.00
Log files
The logs are saved, in Ubuntu, in /var/log/sysstat. There are two types of log files:
- saXX files : Logs in binary format. Use
sarto read them. - sarXX files : Logs in plain text. Use
lessorcatto read them.