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Full Discussion: How do sa1/sar time intervals work?
Operating Systems Linux Red Hat How do sa1/sar time intervals work? Post 302250455 by mschwage on Thursday 23rd of October 2008 11:05:14 AM
Old 10-23-2008
How do sa1/sar time intervals work?
Hi,
I have set up sar on my RedHat and Fedora Linux systems. I am running sa1 from cron:

Code:
0 8-17 * * 1-5 /usr/lib/sa/sa1 1200 3 &

The 1200 and 3 parameters tell sa1 to save data every 1200 seconds (== 20 minutes) and to write 3 times.

When I run sar to observe my data, I'll see something like this:
Code:
# sar -A -f /var/log/sa/sa22 | more
Linux 2.6.21-1.3228.fc7 (opchux0011.comp.optiver.com)   10/22/2008

12:00:01 AM    proc/s
12:10:01 AM      0.03
12:20:01 AM      0.03
12:30:01 AM      0.03
12:40:01 AM      0.03
12:50:01 AM      0.03
01:00:01 AM      0.03
01:10:01 AM      0.18
01:20:01 AM      0.03
01:30:01 AM      0.38
01:40:01 AM      0.03
01:50:01 AM      0.03
...

...What gives? Why is it reporting data every 10 minutes? How come I only see 1 entry every 10 minutes, and not 3? I'm confused...

Thanks.
-mschwage
 

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LEARN ABOUT REDHAT

sa1

SA1(8)								Linux User's Manual							    SA1(8)

NAME

       sa1 - Collect and store binary data in the system activity daily data file.

SYNOPSIS

       /usr/lib/sa/sa1 [ interval count ]

DESCRIPTION

       The  sa1 command is a shell procedure variant of the sadc command and handles all of the flags and parameters of that command. The sa1 com-
       mand collects and store binary data in the /var/log/sa/sadd file, where the dd parameter indicates the current day. The interval and  count
       parameters  specify  that  the  record  should be written count times at interval seconds. If you do not specify these parameters, a single
       record is written.

       The sa1 command is designed to be started automatically by the cron command.

EXAMPLES

       To create a daily record of sar activities, place the following entry in your root or adm crontab file:

       0 8-18 * * 1-5 /usr/lib/sa/sa1 1200 3 &

FILES

       /var/log/sa/sadd
	      Indicate the daily data file, where the dd parameter is a number representing the day of the month.

AUTHOR

       Sebastien Godard <sebastien.godard@wanadoo.fr>

SEE ALSO

       sar(1), sadc(8), sa2(8), mpstat(1), iostat(1), vmstat(8)

       http://perso.wanadoo.fr/sebastien.godard/

Linux								   DECEMBER 1999							    SA1(8)
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