RE: question about cpu usage

Ryan - No I meant the "uptime" command. On most Unix systems uptime lists
the run queue length over several time samples.
 

Dennis Williams

DBA

Lifetouch, Inc.

 

  _____  

From: ryan_gaffuri@xxxxxxxxxxx [mailto:ryan_gaffuri@xxxxxxxxxxx] 
Sent: Friday, October 22, 2004 5:46 PM
To: DENNIS WILLIAMS; oracle-l@xxxxxxxxxxxxx
Cc: DENNIS WILLIAMS
Subject: RE: question about cpu usage

 

 

i'm assuming you mean vmstat? what do you look for? 


> Ryan 
> Perhaps you can tolerate a mini-O.S. lesson. 
> A process can be in several states -- running (only one process/CPU), 
> waiting (for I/O, user response, etc.), or ready-to-run (or run queue).
The 
> O.S. lets each process have the CPU (running) for a short interval of
time, 
> or until it must wait for something like I/O. Once a process has its I/O 
> satisfied, it is put on the ready-to-run queue until the O.S. decides to
put 
> it back on the CPU. 
> Basically there is a queue of processes waiting for the CPU. If the 
> system is nearly idle, that queue will be very short. When the process is 
> back from the I/O, it is quickly put back on the CPU. If the system is 
> heavily loaded, then the queue will get very long. If you are interested
and 
> on Unix, check out the uptime command, which will show you th e length of
the 
> run queue on your server. 
> Many people find the run queue a better indicator of how heavily loaded 
> an OLTP server is. 
> 
> Dennis Williams 



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