check_load --- divide by number of cpus?

[Thomas Guyot-Sionnest]

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On 09/05/08 08:36 AM, Ugo Bellavance wrote:
> Terry a écrit :
>> I am sitting here racking my brain on this one.  Is dividing the load
>> average by the number of CPUs a smart thing to do?  the 'uptime'
>> command on a box does not do this.  So, if I have an 8 core box
>> sitting with a load average of 8, its the same as a single core box
>> sitting with a load average of 1?  I'll see the same type of server
>> response?  Thoughts?
> 
> It depends.  What are you running, cpu-intensive processes?  Multi or 
> single-threaded? I/O intensive processes?  If you are running mostly I/O 
> intensive process, don't forget that your I/O subsystem (hard drives) is 
> shared among all processes, no matter how many CPUs you have.

I fully agree with that; however I don't think looking at the load
average is always the best way to determine when i/o becomes a bottleneck.

It greatly depends on the application type. Is there a fixed number of
"readers" or will in increase with system load? If it's fixed, chances
are that load-average will rapidly become equal to that number of
readers, and any load increase will only decrease the response time for
clients. Also will application using assync i/o even make the
load-average raise? (I don't think so...)

Thomas
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