Typo

[linux_from_scratch_hints.git] / OLD / sysstat.txt

AUTHOR:   Randy McMurchy <LFS-User_at_mcmurchy_dot_com>

DATE:     2004-06-10

LICENSE:  Creative Commons Attribution-NonCommercial-ShareAlike License
          http://creativecommons.org/licenses/by-nc-sa/1.0/

SYNOPSIS: Installing the sysstat package for system performance monitoring

DESCRIPTION:

This hint provides instructions for the installation of Sebastien Godard's
sysstat package and for setting up a cron schedule to keep daily reports of
of system activity. The sysstat package includes the "sar" utilities found on
major commerical Unix flavors.

ATTACHMENTS:

none

PREREQUISITES:

Nothing is required except a base LFS system.

HINT:

=========
CONTENTS:
=========

        1. Introduction
        2. Package Dependencies
        3. Package Installation
            Download the package
            Configure the build
            Build the package
            Checking the build
            Install the package
            Stripping the binaries
            Installing the init script
        4. Setting Up A Crontab
        5. Using The Sysstat Utilities
        6. Closing

================
1. INTRODUCTION:
================

The sysstat package provides system performance monitoring and daily activity
report gathering. This package provides all the capabilites found in the sar
utilities installed on major commercial Unix flavors. The package is stable,
easy to install and set up and can be used with all Linux kernels.

The sysstat utilities provide information from the kernel proc filesystem,
and as such, cannot display statistics that Linux does not provide, or can
they be more accurate than Linux is.

The sysstat package has been designed with National Language Support (NLS) in
mind, using the GNU gettext package. At the present time, English, French,
German, Spanish, Portuguese, Afrikaans, Norwegian, Italian, Russian,
Romanian, Polish, Slovak and Japanese translations are available.

Check out the SYSSTAT utilities home page at:
http://perso.wanadoo.fr/sebastien.godard/

========================
2. PACKAGE DEPENDENCIES:
========================

The only dependency of the sysstat package is a cron scheduler. This is
optional. However, without a cron scheduler, daily activity reports can not
be retained.

I use Paul Vixie's old cron package as this package most closely resembles
the cron facilities I am used to. I've not looked at Fcron yet, but my
understanding is it aims to replace Vixie Cron and operates in a very similar
manner. Instructions for downloading and installing both packages can be
found at the following URLs.

Vixie Cron:

http://www.linuxfromscratch.org/hints/downloads/files/vixie-cron.txt
Alternate download location: http://www.mcmurchy.com/lfs/vixie-cron-3.0.1.tar.bz2

Fcron:

http://www.linuxfromscratch.org/blfs/view/stable/general/fcron.html

========================
3. PACKAGE INSTALLATION:
========================

---------------------
Download the package:
---------------------

The current stable release of the sysstat package is sysstat-5.05 and can be
downloaded using the following URL's:

Anonymous FTP:

ftp://ibiblio.org/pub/linux/system/status/sysstat-5.0.5.tar.gz

HTTP:

http://perso.wanadoo.fr/sebastien.godard/sysstat-5.0.5.tar.gz

--------------------
Configure the Build:
--------------------

You may wish to view the README file included in the root of the source tree
before we begin. This file provides an overview of the installation process,
as well as a list of all files which will be installed on your system.

The configuration process is interactive. You'll be prompted to supply the
required configuration information. I'll try to explain (if necessary) the
information as we go along. After the "make config" command below, everything
else you see is what you will be prompted for, with the supplied parameter I
use. If there is no parameter listed after the prompt, I simply hit "Enter"
to use the default.

Note: I manually put the ==> arrow in after the prompt and before the
supplied parameter. You won't see this arrow, it's only there to separate the
prompt from the supplied parameter.

Begin the configuration script by running the following command:

make config

Installation directory: [/usr/local] ==> /usr
System activity directory: [/var/log/sa] ==>
Clean system activity directory? [n] ==>
Enable National Language Support (NLS)? [y] ==>
Linux SMP race in serial driver workaround? [n] ==> (typically not required,
                                                     see the FAQ)
sa2 uses daily data file of previous day? [n] ==>
Number of daily data files to keep: [7] ==> (should be less than 29)
Group for manual pages: [root] ==>
Set crontab to start sar automatically? [n] ==> (we'll do this later,
                                                 if desired)

------------------
Build the Package:
------------------

Simply running the "make" command will build the package.

-------------------
Checking the Build:
-------------------

There are no "check" rules in the various subdirectory makefiles, so there's
nothing to check. Running the "make check" command is pointless.

--------------------
Install the Package:
--------------------

****************************************************************************
*****                                                                  *****
*****  The remainder of this hint must be performed by the root user   *****
*****                                                                  *****
****************************************************************************

Simply issue a "make install" command to install the package.

-----------------------
Stripping the Binaries:
-----------------------

If desired, strip the unnecessary symbols from the installed binaries by
issuing the following commands:

strip --strip-all /usr/bin/sar /usr/bin/iostat /usr/bin/mpstat
strip --strip-debug /usr/lib/sa/sadc

---------------------------
Installing the Init Script:
---------------------------

An init script is required for the sysstat package, but not for conventional
reasons. Typically, a package init script is used to start a daemon. For the
sysstat package, an init script is provided simply to run the sadc program
at boot time. This is required so that the LINUX RESTART message can be
inserted into the daily data file, indicating that the relevant kernel
counters have been reinitialized.

If your plans for the sysstat package do not include using cron to store
daily information in activity files, an init script is not necessary.

To create a BLFS-compliant boot script, issue the following command:

cat > /etc/rc.d/init.d/sysstat << "EOF"

#!/bin/sh
# Begin $rc_base/init.d/sysstat

# Based on sysklogd script from LFS-3.1 and earlier.
# Rewritten by Gerard Beekmans  - gerard@linuxfromscratch.org
# SYSSTAT bootscript submitted by Randy McMurchy - LFS-User_at_mcmurchy_dot_com
# SYSSTAT bootscript commands by Sebastien Godard <sebastien dot godard at wanadoo dot fr>

. /etc/sysconfig/rc
. $rc_functions

case "$1" in
        start)
                echo "Calling the system activity data collector (sadc)..."
                /usr/lib/sa/sadc -F -L -
                evaluate_retval
                ;;

        *)
                echo "Usage: $0 start"
                exit 1
                ;;
esac

# End $rc_base/init.d/sysstat
EOF

Now create the required symbolic link(s) to the init script in your required
start-up directory(ies). The following is an example:

ln -sf  ../init.d/sysstat /etc/rc.d/rc3.d/S10sysstat

Do substitute your desired startup directory(ies) and S##.

========================
4. SETTING UP A CRONTAB:
========================

To keep daily reports of system activity, you'll need to add entries to the
crontab table for whatever user you use for maintenance activities. I use
root's crontab entry for this. If you use a user other than root, make the
appropriate ownership changes to the /var/log/sa directory.

Sample crontab entries can be found in the crontab.sample file found in the
root of the sysstat source tree. I use the following:

# minute  hour  monthday  month  weekday      command

# activity reports every 20 minutes everyday
   0       *       *        *       *         /usr/lib/sa/sa1 1200 3 &

# Daily summary prepared at 19:05
   5       19      *        *       *         /usr/lib/sa/sa2 -A &

See the man pages for sa1 and sa2 for more information on these commands.
If you use an external crontab file to create/modify the entries, don't
forget to submit the crontab file after you are finished.

==============================
5. USING THE SYSTAT UTILITIES:
==============================

The utilities included with the sysstat package include sar, iostat, mpstat,
sa1, sa2 and sadc. The sar, iostat and mpstat utilities are meant to be used
as command-line utilities. The others are used within the cron system.

Reference the respective man pages for each of these command's capabilities,
switches and parameters. After you've installed the package, and started
collecting activity statistics, simply running the sar command will list the
current day's activity summary. Here's a sample display of sar's output when
when run without any switches or parameters:

13:00:00          CPU     %user     %nice   %system   %iowait     %idle
13:00:00          all      0.09      0.00      0.06      0.01     99.85
13:20:00          all      0.09      0.00      0.05      0.01     99.85
13:40:00          all      0.09      0.00      0.05      0.00     99.85
14:00:00          all      0.09      0.00      0.06      0.01     99.85
14:20:00          all      2.68      0.00      1.56      0.54     95.22
14:40:00          all      4.14      0.00      7.69      0.28     87.89
15:00:00          all     16.20      0.00      5.43      1.30     77.07
15:20:00          all      0.71      0.00      0.38      0.09     98.82
15:40:00          all      4.67      0.00      6.18      0.11     89.04
16:00:00          all      5.80      0.00      6.11      0.14     87.96
16:20:00          all     16.01      0.00      8.75      0.16     75.07
16:40:00          all      4.25      0.00     10.47      0.04     85.23
17:00:00          all     10.40      0.00     13.39      0.04     76.17
17:20:00          all     13.43      0.00      9.62      0.05     76.89
17:40:00          all      6.89      0.00      9.24      0.03     83.85
18:00:00          all      6.99      0.00     12.48      0.18     80.35
18:20:00          all      5.56      0.00      8.28      0.05     86.11
18:40:00          all      2.95      0.00      4.23      0.02     92.80
19:00:00          all      1.68      0.00      2.69      0.04     95.59
19:20:00          all      0.68      0.00      0.15      0.02     99.15
19:40:00          all      0.67      0.00      0.15      0.01     99.17
20:00:00          all      1.28      0.00      1.70      0.02     97.00
20:20:00          all      0.69      0.00      0.15      0.01     99.15
20:40:00          all      1.11      0.00      1.38      0.01     97.50
21:00:00          all      0.71      0.00      0.15      0.00     99.14
21:20:00          all      4.29      0.00      9.81      0.05     85.86
21:40:00          all     15.37      0.00      8.93      0.04     75.67
22:00:00          all     14.50      0.00      5.21      0.08     80.21
22:20:00          all     24.87      0.00     25.53      0.01     49.59
22:40:00          all      5.52      0.00      8.14      0.03     86.31
23:00:00          all      0.94      0.00      0.30      0.04     98.72
23:20:00          all      1.24      0.00      0.51      0.04     98.21
23:40:00          all      0.46      0.00      0.08      0.00     99.46
Average:          all      2.51      0.00      2.40      0.05     95.04

(The average is skewed in this example, as this output only shows eleven
hours of activity)

Here is sample output of the very tail end of a program compilation, using
the command "sar 2 5" (get 5 statistics displays, every 2 seconds):

Linux 2.6.4 (rmlinux)   06/10/04

14:26:28          CPU     %user     %nice   %system   %iowait     %idle
14:26:30          all     97.50      0.00      2.50      0.00      0.00
14:26:32          all     41.29      0.00      3.48      5.47     49.75
14:26:34          all      0.00      0.00      0.00      0.00    100.00
14:26:36          all      0.00      0.00      0.00      0.00    100.00
14:26:38          all      0.00      0.00      0.00      0.00    100.00
Average:          all     27.77      0.00      1.20      1.10     69.93

There are many, many switches and parameters to use with the sar command
to provide many other performance statistics.

===========
6. CLOSING:
===========

I find the sysstat package very useful. As a Linux system administrator, you
hardly can live without it. Sure, there are other utilities that can provide
the same information (top, procinfo, etc.), but the sysstat package provides
the capability for retaining historical information.

It's my belief that the sysstat package belongs in the BLFS book, as there is
currently no performance monitoring and statistics gathering package
available. Perhaps one day the decision will be made to include the sysstat
package in the BLFS book. Until then, I'll keep this hint updated with
anything I discover that needs mentioning. Enjoy!


ACKNOWLEDGEMENTS:

Sébastien Godard <sebastien dot godard at wanadoo dot fr> for creating and
maintaining the package.

CHANGELOG:

[2004-06-10]
    * Original draft