Re: Constraining CPU usage

Arne Woerner <arne_woerner@xxxxxxxxx> wrote:  --- Shane Ambler  wrote:
> On 3/12/2005 3:14, "Arne Woerner"
>  wrote:
> > Why should somebody want to keep CPU usage of a
> > process below a certain value (e. g. 20%)?
> 
> Well if your machine isn't smp enabled (specifically
> pre-HTT) then one process can slow the server down
> to a point where your web/databse server can't get
> processor time to give a response - effectively making
> it non existent for the duration.
> 
Hmm...

Isn't that problem solved already by nice'ing a process?
I think that problem is completely solved by idprio'ing a
process...

Because:
When the NIC gets a packet for a database server, the kernel
interrupts the executing of a potential idprio'ed process and
starts the DB process... Or am I wrong?

-Arne

Looks pretty simple and clear. Thank you Arne.
  In respect to what Mike said i must admit: "its all about high utilization 
numbers fear"
  If the machine was smp enabled i think the number would be around 50% or so.. 
thank you Shane.
  
  Reasoning the topic i believe i should do a little research on:
  
  Understanding units and measurements used in FreeBSD performance 
representation.
  
  Calculating a machine's available resources and estimating its possible  
low/average/peak load when performing user/system tasks during a  specific 
amount of time (24 hours). E.g: 1 user will read $File of  $Size Mb from 
$Storage_media using $Transfer_media. The operation will  last $time and 
consume $CPU CPU time, $Storage_media_capacity  $Transfer_media_bandwith, $RAM, 
$Other shared resources.
  
  So eventually, one can build an operations chart/table, estimate  timings and 
balance a target machine's load among the processes that  are a subject to 
order/priority.
  
  Gather and analyze collected in a real-time situation statistics.
  
  I'm planning to google that for a while.
  
  Thank you everyone once again.
  
  nash

                
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