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Questions tagged [sar]

System Activity Report: a Unix/Linux command to display various system loads (Wikipedia).

sar is a widely used system load monitor in POSIX.

Sar shows current status of memory, CPU load and network usage, and it can log the load statistics over time.

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How to view historical usage metrics, per process?

My first inclination here would be something built into SAR, or the sysstat package in general. If that is indeed the case however, I can't seem to find this solution. What I would like to see, and absolutely preferably through sysstat if possible,…
MrDuk
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How to find network latency for network interfaces using SAR on linux environment

I want to get the network latency for network interfaces using SAR on linux environment. sar -n command provides following output: 10:00:13 AM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s 10:00:14 AM lo 0.00 …
Abhishek
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sar-like Utility For File Access

I'm troubleshooting a linux server's performance degradation from last night. I have sysstat installed on the server and it's polling every 2 minutes. At around the time the event happened, there was a lot of disk activity (using sar -b and sar…
Ken S.
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runqueue length in vmstat and sar

i am looking at the vmstat output to assess certain performance degradation on our systems, specifically for long runqueue. i find frequently it looks like this on a 8 CPU m/c: Mon Jun 13 12:14:02 2016 procs -----------memory---------- ---swap--…
raven
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Shell Script to check CPU Utilisation

I am trying to write a shell script which will check free memory of the server. I am trying below code top -M -n1 | grep "Mem" | awk '{print 0 + $7}' | awk '{ print $1 / 1024 }' | awk '{if ($1 < 1) print "\n Available Free memory is " $1…
Shyam
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Why top output different from sar output?

This is SLES11sp3 system. The command top shows the load average of 17+, as shown below: #top top - 11:59:14 up 19 days, 21:55, 40 users, load average: 17.09, 17.29, 19.22 Tasks: 514 total, 1 running, 512 sleeping, 1 stopped, 0…
Wei
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interpreting disk stats using sar

I have JBOD and Cassandra installed on it. I'm trying to figure out if my disk are totally free or they are boring. The sar -d result is in the end. As I understand until %util is low (less then 1) it means that all disk are boring? Am I correct in…
Piotr Stapp
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Nor able to parse the SAR output

We are using SuSE 10 OS and lately I wish to know the total network bandwidth used for a period of time lets say for 1 week. We have sar enabled and the sar data for a week is there. Now I know how to use sar command to provide network information…
user220768
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High CPU usage in RHEL machine

I have RHEL machine that runs postgres-9.1 database. In a particular time, sar output shows as follows: Refer link for snapshot: http://imgur.com/gKcOhOX,vNwTpwC#0 where as %user is high between 12:50 AM and 1:50 AM & others are asusual, and later…
harishtallam
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CRON opens and closes sessions continuously

I'm seeing a huge amount of these lines in my auth logs: Dec 31 03:45:01 xxxxxxx CRON[17259]: pam_unix(cron:session): session opened for user root by (uid=0) Dec 31 03:45:01 xxxxxxx CRON[17259]: pam_unix(cron:session): session closed for user…
MultiformeIngegno
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SAR statistics on CPU usage

i have Ubuntu server with 2 processors. top command show that mysql eats up to 195%. sar shows the following: 08:30:59 AM CPU %user %nice %system %iowait %steal %idle 08:31:00 AM all 75.12 0.00 0.00 0.00…
ravnur
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Sar data not collected for 10 minutes

We have a RedHat server whose only job is to run a JBoss server. Monitors said that memory usage spiked (we have the JVM limited to far less than the total memory on the system) and JBoss crashed. We restarted and everything seems ok now. Odd…
Ichorus
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rhel + disk util is very high , what is the impact for long term

we have backup server with rhel version 7.2 server is VM machine , and OS disk is VMDK disk disk used space is around - 50% , and from smartctl we not see problem as we can see from follwing details the disk util is very high sometimes even reached…
King David
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High I/O wait and Context Switches - how to debug

Update: sar -W -B -d output added to bottom of post. I have simulated this on boot. I have uwsgi starting 9 instances of a django app, along with gunicorn for websockets, and dramatiq for queue handing. It seems like it swaps like crazy for the…
Tim Nelson
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enough memory for downscale ubuntu server?

Management decided to downscale prod server. Current size: Standard B16ms (16 vcpus, 64 GiB memory) Desired size: Standard B8ms (8 vcpus, 32 GiB memory) CPU is mostly idle (output is from sar -u) 10:20:01 CPU %user %nice …
catalin
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