Sar: Difference between revisions
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sar stands for “System Activity Reporter” and provides a wide range of metrics related to system usage, including CPU utilization, memory usage, disk I/O, network activity. | sar stands for “System Activity Reporter” and provides a wide range of metrics related to system usage, including CPU utilization, memory usage, disk I/O, network activity. | ||
on Ubuntu, sar can be installed by following<ref>https://stackoverflow.com/questions/45725414/cannot-open-var-log-sysstat-sa16-please-check-if-data-collecting-is-enabled-in</ref> <syntaxhighlight lang="bash"> | on Ubuntu, sar can be installed by following<ref>https://stackoverflow.com/questions/45725414/cannot-open-var-log-sysstat-sa16-please-check-if-data-collecting-is-enabled-in</ref> <syntaxhighlight lang="bash"> | ||
#install sar | #install sar | ||
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== Command and options == | == Command and options == | ||
sar has a lot of arguments and options, | sar has a lot of arguments and options and basic comman syntax is following, | ||
$ sar -[ options ] time_interval number_of_tines_to_display | |||
$sar --help | |||
Full description is available in sar man page<ref>https://linux.die.net/man/1/sar</ref> | |||
Here are few examples, | |||
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Revision as of 12:13, 7 December 2023
Monitoring server resources is a crucial part of identifying any bottlenecks and possible issues on your server.
sar stands for “System Activity Reporter” and provides a wide range of metrics related to system usage, including CPU utilization, memory usage, disk I/O, network activity.
on Ubuntu, sar can be installed by following[1]
#install sar
$ sudo apt-get install -y sysstat
# Enable data collecting
sed -i 's/false/true/g' /etc/default/sysstat
# Change the collection interval from every 10 minutes to every 2 minutes
sed -i 's/5-55\/10/*\/2/g' /etc/cron.d/sysstat
# Restart service
$ sudo systemctl start sysstat
sar system service
sar can be run as system service as well,
- sudo systemctl start sysstat
- sudo systemctl enable sysstat
- This will add the required cron jobs so that the system data is collected accordingly. The cron jobs will be added at cat /etc/cron.d/sysstat
Command and options
sar has a lot of arguments and options and basic comman syntax is following,
$ sar -[ options ] time_interval number_of_tines_to_display
$sar --help
Full description is available in sar man page[2]
Here are few examples,
| Options | Description | output format |
|---|---|---|
sar -u 2 30
|
-u for all CPU,
|
|
sar -r 2 30
|
-r for memory | |
| sar -n DEV 4 | -n for network interfaces,
4 means that the sar command should run every 2 seconds |
|
| sar -d | -d command to view disk I/O statistics, including IOPS | DEV tps rkB/s wkB/s dkB/s areq-sz aqu-sz await %util
tps is IOPS |