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Full Discussion: Bash script affect load average
Top Forums Shell Programming and Scripting Bash script affect load average Post 302817597 by capilla on Thursday 6th of June 2013 05:30:24 AM
Old 06-06-2013
Bash script affect load average
Hello
I have created next scritpt to do the next: chekp if host is alive. When the host down, launch telnet other equip to do checks.
When execute the script the load average of the machines increase. For example:
Before launch script
Code:
top - 11:14:56 up 14 days, 18:06,  3 users,  load average: 2.66, 2.52, 2.26
Tasks: 251 total,   2 running, 234 sleeping,   0 stopped,  15 zombie
Cpu(s):  7.0%us, 10.3%sy, 25.7%ni, 56.9%id,  0.0%wa,  0.0%hi,  0.1%si,  0.0%st
Mem:   3097180k total,  2782136k used,   315044k free,   182920k buffers
Swap:  3903480k total,      624k used,  3902856k free,  2064220k cached

After 10 min launch the script
Code:
top - 11:24:09 up 14 days, 18:15,  3 users,  load average: 3.88, 3.48, 2.85
Tasks: 250 total,   2 running, 230 sleeping,   0 stopped,  18 zombie
Cpu(s): 20.5%us, 25.3%sy,  0.2%ni, 53.8%id,  0.0%wa,  0.1%hi,  0.2%si,  0.0%st
Mem:   3097180k total,  2797204k used,   299976k free,   183912k buffers
Swap:  3903480k total,      624k used,  3902856k free,  2067728k cached

After 3 hours the load average can be 17 or more.
What is the problem with the script? It's the | ? the sleps??
The script:
Code:
#!/bin/bash
HOSTS="198.19.1.174"
COUNT=1
COUNT2=1
COUNT3=0
USER="****"
PASS="****"
#touch result$COUNT3.txt
function bucle(){
while [  $COUNT2 -lt 10 ];
do
  count=$(ping -c $COUNT $HOSTS | grep 'received' | awk -F',' '{ print $2 }' | awk '{ print $1 }')
  if [ $count -eq 0 ]; then
    # 100% failed
    echo "Host : $myHost is down (ping failed) at $(date)"
( echo open 198.19.1.174
sleep 2;
echo ${USER}
sleep 2;
echo ${PASS}
sleep 2;
echo "sh clock"
sleep 2;
echo "ping vrf OOB 198.19.1.175"
sleep 2;
echo "ping vrf OOB 198.19.1.176"
sleep 2;
echo "sh ip arp vrf OOB vlan 1307 | i 198.19.1.175"
sleep 2;
echo "sh ip arp vrf OOB vlan 1307 | i 198.19.1.176"
sleep 2;
echo "sh mac-address-table interface gigabitEthernet 7/29"
sleep 2;
echo "sh mac-address-table interface gigabitEthernet 7/33"
sleep 2;
echo "sh clock"
sleep 2;) |telnet
( echo open 198.18.1.174
sleep 3;
echo ${USER}
sleep 3;
echo ${PASS}
echo "ping vrf OOB 198.19.1.175 source vlan 1207"
sleep 10;
echo "ping vrf OOB 198.19.1.176 source vlan 1207"
sleep 10;) |telnet
COUNT3=COUNT3+1
#echo $COUNT3
fi
done
}

bucle

Thanks!!!!!
 

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LEARN ABOUT MOJAVE

hostinfo

hostinfo(8)						    BSD System Manager's Manual 					       hostinfo(8)

NAME

     hostinfo -- host information

SYNOPSIS

     hostinfo

DESCRIPTION

     The hostinfo command displays information about the host system on which the command is executing.  The output includes a	kernel version
     description, processor configuration data, available physical memory, and various scheduling statistics.

OPTIONS

     There are no options.

DISPLAY

	   Mach kernel version:
	   The version string compiled into the kernel executing on the host system.

	   Processor Configuration:
	   The maximum possible processors for which the kernel is configured, followed by the number of physical and logical processors avail-
	   able.

	   Note: on Intel architectures, physical processors are referred to as cores, and logical processors are referred to as hardware threads;
	   there may be multiple logical processors per core and multiple cores per processor package.	This command does not report the number of
	   processor packages.

	   Processor type:
	   The host's processor type and subtype.

	   Processor active:
	   A list of active processors on the host system.  Active processors are members of a processor set and are ready to dispatch threads.
	   On a single processor system, the active processor, is processor 0.

	   Primary memory available:
	   The amount of physical memory that is configured for use on the host system.

	   Default processor set:
	   Displays the number of tasks currently assigned to the host processor set, the number of threads currently assigned to the host proces-
	   sor set, and the number of processors included in the host processor set.

	   Load average:
	   Measures the average number of threads in the run queue.

	   Mach factor:
	   A variant of the load average which measures the processing resources available to a new thread.  Mach factor is based on the number of
	   CPUs divided by (1 + the number of runnablethreads) or the number of CPUs minus the number of runnable threads when the number of
	   runnable threads is less than the number of CPUs.  The closer the Mach factor value is to zero, the higher the load.  On an idle system
	   with a fixed number of active processors, the mach factor will be equal to the number of CPUs.

SEE ALSO

     sysctl(8)

Mac OS X							 October 30, 2003							  Mac OS X
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