Checking CPU Load

[michaelsnijder]

Hey guys,

I have searched the forums, but couldnt find anything that could help me.

I want to monitor the cpu load of my webservers, there are a couple of possibilities CPU in percents, and decimal. I want to use the Decimal option. Now i dont want zabbix to bother me if the server goes 1 time over the trigger. I want to give the server 10 minutes to recover back to below the trigger line, if he doesnt, zabbix may message me. I have tried this with the following trigger:

({Template:system.cpu.load[,avg1].max(300)}>15)&({Template:system.cpu.load[,avg1].time(0)}>070000)& ({Template:system.cpu.load[,avg1].time(0)}<235959)

What i currently do think is that zabbix just fires the trigger every 5 minutes, It just checks every 5 minutes. Means it will do a check, if the CPU load is above 15 at that time it will message me.

Does anyone have a solution for this problem?

[nelsonab]

Are you sure you want to check system load, not cpu load? System load will go up if you have items waiting for IO even if the CPU is idle. System load is essentially the number of running processes waiting for something from the kernel be it IO or CPU.

Try using system.cpu.util[,user,avg1] and system.cpu.util[,system,avg1] instead.

Although if you system is sitting at a load average of 15 I'd say there is something worth looking into as the system is likely to be very s_l_o_w. ;-)

[michaelsnijder]

Are you sure you want to check system load, not cpu load? System load will go up if you have items waiting for IO even if the CPU is idle. System load is essentially the number of running processes waiting for something from the kernel be it IO or CPU.

Try using system.cpu.util[,user,avg1] and system.cpu.util[,system,avg1] instead.

Although if you system is sitting at a load average of 15 I'd say there is something worth looking into as the system is likely to be very s_l_o_w. ;-)

Your right about the load average of 15, i changed it because it spammed me with messages , What does the system.cpu.util[,system,avg1] actually check?

[nelsonab]

It will monitor where the cpu is physically spending it's time. Is it spending it's time with programs (user) in the kernel, waiting for IO or servicing process which have been niced.

I have attached a graph from a local test system to give you a better view. The glitches were from the VMware host. :-)

[vikty]

try to use this trigger

({Template_System:system.cpu.load[,avg1].avg(600)}>4*{Template_System:cpu.number.last(0)}) &({Template_System:system.cpu.util[,user,avg1].avg(600)}>80|{Template_System:system.cpu.util[,system,avg1].avg(600)}>80|({Template_System:system.cpu.util[,system,avg1].avg(600)}<40&{Template_System:system.cpu.util[,user,avg1].avg(600)}<40))

And you write this in zabbix_agentd.conf

UserParameter=cpu.number,cat /proc/cpuinfo | grep processor | wc -l

read this forum for more information

http://www.zabbix.com/forum/showthread.php?t=6963&highlight=load

[michaelsnijder]

I will give it a try, i will get back to you soon!

Thanks for your help, its appreciated!

[michaelsnijder]

try to use this trigger



And you write this in zabbix_agentd.conf



read this forum for more information
http://www.zabbix.com/forum/showthre...highlight=load

What does you trigger exactly do?

[michaelsnijder]

It will monitor where the cpu is physically spending it's time. Is it spending it's time with programs (user) in the kernel, waiting for IO or servicing process which have been niced.

I have attached a graph from a local test system to give you a better view. The glitches were from the VMware host. :-)

Hey there,

I have tried to use it in zabbix, but it doesnt give me a output like you. I only get whole numbers. The item key is set to Numeric float. Not sure what im doing wrong.

[vikty]

Hi, sorry for the delay

well, my trigger is true whene, The CPU Load is more than 4*CPU-number
(CPU load=8 for 2 CPU; CPU Load=4 for 1 CPU) and whene The User or SYS Utilization Is more than a value (ex. 80%)

now in the post:

http://www.zabbix.com/forum/showthre...highlight=load

There is a pseudo code... that will be translate in some language.... (C++, boolean code.....)

The items values are in float (except CPU number)

To try the trigger you can try with low trigger value...

[vikty]

PS
Idle isn't important

[michaelsnijder]

hey guys, thanks for your help i fixed it with my own trigger, i changed max to min :P

Thanks!