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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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sar: enable data collecting

I've just installed the sysstat package on Manjaro. When running sar for the first time I see: Cannot open /var/log/sa/sa21: No such file or directory Please check if data collecting is enabled How do I check whether data collecting is enabled? If…
Tom Hale
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Relation between disk IOPS and sar tps

I'm trying to estimate IOPS requirements of my application running on 32-bit CentOS 6.2. I started to take some measurement on a machine with SATA disks and I'm quite confused of difference between IOPS and tps measured by sar. According to…
pystole
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What does the fields in sar -B output mean?

The sar manpage says : pgpgin/s - Total number of kilobytes the system paged in from disk per second. pgpgout/s - Total number of kilobytes the system paged out to disk per second. fault/s - Number of page faults (major + minor) made by…
rags
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How do I see what's in the run queue on GNU/Linux?

The load on my server is very high, even though there doesn't seem to be much disk activity and the CPU is idle. Using sar, I can see the run queue is getting full, but is there any way to see what's in the run queue?
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Invalid system activity (sysstat) file on Ubuntu server

I'm periodically getting this message from the daily cron on my server. (I don't get this message every day.) /etc/cron.daily/sysstat: Invalid system activity file: /var/log/sysstat//sa28 Here's some basic info on my server: Ubuntu 12.04.2…
MountainX
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How to find what processes were running at a time in the past?

I am asked to investigate a high CPU usage alert which occurred this morning. I used sar -p and saw the high CPU usage showing up at that time Next I used ps -eo pcpu,pid,user,args | sort -r -k1 | less to list the top 10 memory hogs at this hour Now…
juniorbansal
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CentOS - High CPU Usage at a particular time in the night

I have a CentOS-5 server that has very little load. A typical output of "sar" command shows like this: 02:20:01 PM CPU %user %nice %system %iowait %steal %idle 02:30:01 PM all 0.63 0.00 1.23 0.31 …
WebTenet Solutions
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How to Change sysstat/sar logging folder

I have just enabled sysstat on one of my servers (Ubuntu 12.04), I have noticed it is logging all to /var/log/sysstat/sa04 /var/log/sysstat/sa05 /var/log/sysstat/sar04 How can I change the sysstat logging path to another folder on another…
Onitlikesonic
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Shell script to notify when CPU usage goes to 100%

sar -u 1 | awk '{print $9}' so this will give me "CPU Idle" value every second. I'd like to get email in this case the value goes to "0" 10 times in a row? What would be the appropriate way to do it? I found a preliminary solution sar -u 1 | awk…
DmitrySemenov
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sa2 -A /var/log/sa/sa13: No such file or directory

I have systat version 7.0.2 and the /etc/sysconfig/sysstat has the entry HISTORY=27, this is on a redhat enterprise server 5.6, the cron setup for this is # run system activity accounting tool every minute * * * * * root /usr/lib64/sa/sa1 1 1 #…
user53925
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opening sar activity files error "Invalid system activity file"

Note: I opened this question on Stackoverflow first and realized that this is the right place for the question. Just stating that it is not a duplicate, already closed the question on SO. I am new to sar(also new to serverfault) I am getting the…
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Why are pgpgin/s and majflt/s inconsistent in sar -B?

In sar -B ouptut, I would naively expect pgpgin/s to equal majflt/s multiplied by the system page size. From man sar: pgpgin/s Total number of kilobytes the system paged in from disk per second. Note:…
simonp
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Reporting historical system activity in FreeBSD

I'd like to record data about system activity under FreeBSD for future analysis. If I were running a SysV system, I'd just sar and its related utilities, but that doesn't exist in the BSDs. (And bsdsar has gone missing.) I don't really care about…
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High await in sar

My database server has the following sar output for the data device: [postgres@dbsrv07 ~]$ LC_ALL=POSIX sar -d |egrep "await|dev253-2" 00:00:01 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util 00:10:01 …
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Sar: Free memory statistics (including buffers, cache)

The free commands gives the amount of free memory in two forms: completely free memory (the Mem line) and disposable memory used for caches and buffers (the -/+ buffers/cache line): -bash-3.2$ free -m total used free …
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