Determening load average. Post: 302116308

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Top Forums Shell Programming and Scripting Determening load average. Post 302116308 by sysgate on Thursday 3rd of May 2007 03:51:44 AM

05-03-2007

Registered User

Yes, do not cross-post please.
This was a hidden catch, just to see if you will get my example verbatim. Why I did that ? If you want to run such script, means you have root priviledges, means someone at your organization trust you, means you're not supposed to be a simple user.
I would also assume that the server you're running has only apache there, hence you want to switch it off when high load is determined. If not, how you can be sure that this is the application that causes the problem ?
In regards to the script - see "man test" for more information. Of course you can compare integer to integer, but bash doesn't have good handling of floating points generated from uptime. Therefore there are few solutions :
using awk in this manner :

Code:

if echo $loadhttpd | awk '{ if ($loadhttpd < '10') {print "10 is bigger then httpload"}}'; then

or using the korn shell, as it has floating point arithmetic since 1993.
I won't write more code, please, try think to about it, and be a real admin, not a user.
Regards and no bad feelings.

sysgate

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LEARN ABOUT REDHAT

tload

TLOAD(1)							Linux User's Manual							  TLOAD(1)

NAME

       tload - graphic representation of system load average

SYNOPSIS

       tload [-V] [-s scale] [ -d delay ] [tty]

DESCRIPTION

       tload prints a graph of the current system load average to the specified tty (or the tty of the tload process if none is specified).

   Options
       The -s scale option allows a vertical scale to be specified for the display (in characters between graph ticks); thus, a smaller value rep-
       resents a larger scale, and vice versa.

       The -d delay sets the delay between graph updates in seconds.

FILES

       /proc/loadavg load average information

SEE ALSO

       ps(1), top(1), uptime(1), w(1)

BUGS

       The -d delay option sets the time argument for an alarm(2); if -d 0 is specified, the alarm is set to 0, which will never send the  SIGALRM
       and update the display.

AUTHORS

       Branko Lankester, David Engel <david@ods.com>, and Michael K. Johnson <johnsonm@redhat.com>.

       Please send bug reports to <procps-list@redhat.com>

Cohesive Systems						   20 Mar 1993								  TLOAD(1)

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