10 Useful Sar (Sysstat) Examples for UNIX / Linux Performance Monitoring

10 Useful Sar (Sysstat) Examples for UNIX / Linux Performance Monitoring

by Ramesh Natarajan on March 29, 2011

Using sar you can monitor performance of various Linux subsystems (CPU, Memory, I/O..) in real time.

Using sar, you can also collect all performance data on an on-going basis, store them, and do historical analysis to identify bottlenecks.

Sar is part of the sysstat package.

This article explains how to install and configure sysstat package (which contains sar utility) and explains how to monitor the following Linux performance statistics using sar.

Results of Fedora 16 Release Name Voting

Fedora 16 is codenamed Verne. Here are other details:

The voting has concluded for the Fedora 16 release name, and the
results are in!  Thank you to the Fedora community members who made
name suggestions and participated in the voting.

The Fedora 16 release name is: Verne

Voting period:  Tuesday 2011-04-05 00:00:00 to Monday 2011-04-11 23:59:59
Number of valid ballots cast:  421

Using the range voting method, each candidate could attain a maximum
of (421*9) = 3789 votes.

The Ultimate Guide to Getting Support on Linux-use empathy to login to IRC….

The Ultimate Guide to Getting Support on Linux
Installing Linux has become effortless to the extent that anyone with a little knowledge of computers can get a Linux machine up and running instantly. However, many of them throw in the towel when faced with even the slightest of glitches. The main reason for this is the belief that Linux doesn’t offer any kind of support.

Other problem users face is that the regular technician who repairs their computer refuses even to touch a machine that’s running Linux. So, if you are one of those users disgruntled after encountering a multitude of problems with a fresh Linux install — don’t panic and read on to know some ways in which you could get support for your Linux installation.

Gnome Tips

Add/Edit GDM Sessions

Each session is a *.desktop file located at /usr/share/xsessions.

GDM appearance

You can change background image, gtk/icon theme by hands (as described at Gnome_2.28_Changes#Configuring_gdm_2.28), or you can use gdm2setup from the AUR.

Tweaking

If your gnome applications seem sluggish and gnome hangs at start-up after killing the previous session, it’s likely you haven’t set your /etc/hosts file correctly and your /etc/hosts file includes:

127.0.0.1       localhost.localdomain     localhost      YOURHOSTNAME

Then run “/bin/hostname YOURHOSTNAME” and “/sbin/ifconfig lo up” as root.

vino – connect to running GNome session like RDP

One thing that all of us Linux users have probably missed is connecting to the running GNome session to see what is going on in the running session. This can be quite handy in couple of situations:

1. Debugging remote sessions – where you do not want a new session, instead want to connect to running session.

2. Maintaining running session from another PC. If you are running some applications on some Linux box and want to gracefully stop it using some commands other than kill -9 then it is best that you connect to the running session, if you are not using screen.

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Shell Scripting

Here are some links for bash programming that you may find useful.

http://tips-linux.net/en/content/pro-bash-programming

http://tips-linux.net/en/content/expert-shell-scripting

http://tips-linux.net/en/content/beginning-linux-command-line

http://tips-linux.net/en/content/bash-pocket-reference

http://tips-linux.net/en/content/linux-command-line-and-shell-scripting-bible

Related articles

• Linux – Learning the Shell (edugeek.net)
• 10 Useful Tools, Websites And Tricks to Help You Master Linux Command (maketecheasier.com)
• lf-submit.sh – Bash mplayer Last.fm scrobbler (yjl.im)
• Linux command line tricks you need to know: IO redirection and piping (interstellr.com)
• imabonehead: Houcem HACHICHA’s Blog: My top ten shell/bash tricks! (houcemhachicha.blogspot.com)

Execute a command with a timeout

Execute a command with a timeout

  <td>
    <div class="text codecolorer">
      &nbsp;timelimit -t100 somecommand
    </div>
  </td>
</tr>

I found this in Ubuntu repos, and consider it better than timeout.

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