Performance monitoring?

[pll at lanminds.com]

In a message dated: Fri, 20 Dec 2002 10:04:17 EST
bscott at ntisys.com said:

>On Fri, 20 Dec 2002, at 9:52am, mod+gnhlug at std.com wrote:
>> I'm not sure I understand what you're trying to measure ...
>
>  It sounds like he is trying to measure how big a bottleneck disk
>performance is.  In other words, he wants to find out how much time does the
>system spend waiting for the disk drive.  Is that accurate, Paul?

Absolutely.  Essentially, I'm looking for 'load average' numbers for 
a disk drive :)

>> ... note that you might find it difficult to characterize certain
>> behaviors of your disk units if they have caches ...
>
>  Since the cache will normally be enabled, one would what it included in
>whatever benchmark you are running.  Running the benchmark under load over
>time should smooth out an irregularities, and give you a better picture of
>what you real-world performance is.

Exactly.  I don't much care about cache hits (well, not today, anyway :)
-- 

Seeya,
Paul
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