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_at_comcast.net [mailto:ryan_gaffuri_at_comcast.net] Sent: Friday, October 22, 2004 5:46 PM
To: DENNIS WILLIAMS; oracle-l_at_freelists.org 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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