What is server load based on?

Svaha

Active Member
Jan 17, 2003
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Any one have an answer for this?

When I look at server status, the load is measured at 0.03, etc.

I know it can go well above 1.0, on some busy servers I have seen it hit double digits. for short periods.

So what exactly is considered a heavy load?

And what is the measurement standard?
i.e. if the load is 1.0, then 1.0 of what, exactly?

Todd
 

hostcp3

Well-Known Member
Jun 18, 2002
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I would like to know what is high, one of our servers ran into trouble sometime ago and some users managed to just about stop the box it showed a load of *wait for it

Server Load 500.83 (1 cpu)

and WHM was still accessible lol, but a website took 20 mins to open, it was some persistant connections *lots of them, we changed apache and mysql config after that, lol
 

jimcarter

Well-Known Member
Jun 30, 2002
152
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UK
wow 500.83 must be a record :D
if your box is constantly over 5.00 for over 10 minutes then you are having a problem, usually anything below that isnt too bad,
Thanks
 

Svaha

Active Member
Jan 17, 2003
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151
500.83!
Bet your box had smoke pouring out the vents!

Jimcarter, thanks for the tip about over 5 for more than 10 minutes.

Any idea what exactly the load measuremant is based on? I mean, it's not like percentages, that would be easy i.e. a load of 90% is easy to understand, but a load of .03 or 1.0 or 5.0 (or 500.83...gads!) seems like an arbitrary figure.

What is this measurement based on, and what is the average it uses for comparison?

Just wondering.
Todd
 

jimcarter

Well-Known Member
Jun 30, 2002
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166
UK
it is the amount of CPU being used,
i.e. a load of 1.00 means that all of the CPU cycles are constantly being used,
below 1.00 means that there are free cycles available for other processes, and above 1.00 means that some processes may have to wait for available CPU power,
thanks
 

hostcp3

Well-Known Member
Jun 18, 2002
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166
hahahaha,

your comments are funny but unfortunately true, this was a once off thing and our boxes constantly run at

Server Load 0.33 (1 cpu) current load with 250 websites.

smoke coming out, not sure, but I was very surprised it was still running, we were on to it within a short time.

Yes we were concerned not for the server but for our clients who could not get to their sites.. a client had purposely tried to kill the box, account terminated apache and mysql files configured end of story until the next time we are not looking every minute!
 

Kyle

Member
Jan 19, 2003
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151
Load average isn't 100% based on cpu usage. You can have a load average of 30 and have 50% of your cpu free. You have to take into account other things such as memory and hard disk bottlenecks.

From what I understand perfect load average is 1 and below for single cpu, and 2 and below for dual cpu. Anything higher than that and your server is not running things as fast as it possibly can.
 

awsol

cPanel Test Bitch
Feb 8, 2002
591
0
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Boston MA
Server load is based on many factors. Pretty much the load is affected by the current running proccess and their crunching. If the server is idle and over 1 you should be worried why the load is high with all idle proccesses.
 

KingmanMe

Active Member
PartnerNOC
Feb 19, 2003
33
0
156
I always thought that the server load was the number of processes waiting for the CPU's attention.

Server Load 500.83 (1 cpu)
Wow, that's quite high :) Saw a load of 280 here once for a short while when things decided to go a bit mad but 500 is just insane :)