on our servers, typing
xenoterracidexenoterracidesar
show's the system load statistics for today starting at midnight, is it possible to show yesterdays statistics?26.8k5555 gold badges160160 silver badges225225 bronze badges
2 Answers
Usually, sysstat, which provides a
sar
command, keeps logs in /var/log/sysstat/
or /var/log/sa/
with filenames such as /var/log/sysstat/sadd
where dd
is a numeric value for the day of the month (starting at 01). By default, the file from the current day is used; however, you can change the file that is used with the -f
command line switch. Thus for the 3rd of the month you would do something like:If you want to restrict the time range, you can use the
-s
and -e
parameters. If you want to routinely get yesterday's file and can never remember the date and have GNU date you could try What is wdm audio file.I highly recommend reading the manual page for sar.
Steven DSteven D33.7k88 gold badges9999 silver badges108108 bronze badges
Try the command as follows to get historic memory utilization details.
The files in
Jeff Schaller♦/var/log/sa
record everything in the world.47.3k1111 gold badges6969 silver badges154154 bronze badges
SidharthaSidhartha
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Can I get memory usage per process with Linux?we monitor our servers with sysstat/sar. But besidesseeing that memory went off the roof at some point, we can't pinpointwhich process was getting bigger and bigger.is there a way with sar (or other tools) to get memory usageper process? and look at it, later on?
kokitokokito
1 Answer
This is purely preference but I would keep it nice and simple until you know what you're looking for. I would create a
cronjob
to first pipe out your free memory, disk and cpu usage and then to display the top ten culprits.After finding your culprit, you can hone in a little more and dig into some specifics.
Jason BirchallJason Birchall
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From the
sar
manpage:%commit
Percentage of memory needed for current workload in relation to the total amount of memory (RAM+swap). This number may be greater than 100% because the kernel usually overcommits memory.
Does this include data that had to be brought into the page cache during the given time period the entry covers?
BratchleyBratchley12.4k77 gold badges4747 silver badges9090 bronze badges
1 Answer
Unlike other metrics (eg. CPU utilization) which are calculated over a time interval, the values displayed by 'sar -r' (among them is %commit) are instantaneous values, based on values read from /proc/meminfo file.So %commit includes data that are in the page cache at the end of the given time period the entry covers.
TipsyTipsy
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Stable release | sysstat 12.1.1[1] / October 13, 2018; 8 months ago |
---|---|
Preview release | |
Repository | github.com/sysstat/sysstat/ |
Written in | C |
Operating system | AIX, Linux, Solaris, HP-UX |
Type | System reporting |
Website | sebastien.godard.pagesperso-orange.fr// |
Called regularly by cron, sadc does the monitoring and stores its measurements to files in the /var/log/sa/ folder. The sar client can be used to explore this data.
System Activity Report (
sar
) is a Unix System V-derived system monitor command used to report on various system loads, including CPU activity, memory/paging, interrupts, device load, network and swap space utilization. Sar uses /proc
filesystem for gathering information [3]Platform support[edit]
Sar was originally developed for Solaris operating system[4] and it is available in Linux, Solaris, AIX, HP-UX, but it is not available for MacOS or FreeBSD, until 2013 there was a
bsdsar
tool actually deprecated [5]. Linux distributions, such as Red Hat Enterprise Linux and SuSe[6] provide
sar
utility through the sysstat
package.Syntax[edit]
- -f
- filename Uses filename as the data source for sar. The default is the current daily data file /var/adm/sa/sadd.
- -e
- time Selects data up to time. The default is 18:00.
- -i
- sec Selects data at intervals as close as possible to sec seconds.
Example[edit]
Sysstat package[edit]
Sar Report Linux Graph
Additional to
sar
command, Linux sysstat package in Debian[7], RedHat Enterprise Linux and SuSE provides additional reporting tools:Download street fighter 4 for pc. The game play remains on traditprotonal 2D plane.
sar(1)
: Collect, report, or save system activity information. – Linux User Commands Manualsa1(8)
: Collect and store binary data in the system activity daily data file. – Linux Administration and Privileged Commands Manualsa2(8)
: shell variant ofsar
, supporting the same flags assar
command which write a daily report in the /var/log/sa directory. – Linux Administration and Privileged Commands Manualsadf(1)
: , similar tosar
but can write its data in different formats (CSV, XML, etc.). This is useful to load performance data into a database, or import them in a spreadsheet to make graphs.iostat(1)
: reports basic CPU statistics and input/output statistics for devices, partitions and network filesystems. – Linux User Commands Manualmpstat(1)
: reports individual or combined processor related statistics. – Linux User Commands Manualpidstat(1)
: reports statistics for Linux tasks (processes) : I/O, CPU, memory, etc. – Linux User Commands Manualnfsiostat(1)
: reports input/output statistics for network filesystems (NFS). – Linux User Commands Manualcifsiostat(1)
: reports I/O statistics for CIFS resources. – Linux User Commands Manual
See also[edit]
sag
- 'system activity graph' command[8]- ksar- BSD licensed Java-based application to create graph of all parameters from the data collected by Unix sar utilities.
- CURT, IBM AIX CPU Usage Reporting Tool
- isag, tcl based command to plot sar/sysstat data
References[edit]
sar(1)
– Solaris 10 User Commands Reference Manual
Footnotes[edit]
- ^https://github.com/sysstat/sysstat/releases/tag/v12.1.1
- ^http://sebastien.godard.pagesperso-orange.fr/
- ^http://sebastien.godard.pagesperso-orange.fr/man_sar.html
- ^https://www.itworld.com/article/2786092/open-source-tools/unix-tip--using-sar-for-long-term-performance-analysis.html
- ^https://www.freshports.org/sysutils/bsdsar
- ^http://www.softpanorama.org/Admin/Monitoring/sar.shtml
- ^https://packages.debian.org/sid/sysstat
- ^'sag(1)'(PDF). SUNOS Reference Manual. Mountain View, California: Sun Microsystems. 1993-02-24. pp. 1–895. Retrieved 2010-05-04.
sag - system activity graph [..] DESCRIPTION sag graphically displays the system activity data stored in a binary data file by a previous sar(1) run.
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