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Re: Measurement of CPU usage
de PaulFXH 05/07/2006 04:41
Al Klein escreveu:
> On 6 May 2006 19:42:23 -0700, "PaulFXH" <paul_hackett2@yahoo.com.br>
> wrote:
>
> >I agree but the differences I'm seeing in the CPU Usage numbers
> >(discounting the System Idle time) is absolutely enormous---3.5% vs 64%
> >in the test I carried out earlier today.
> >I don't think anybody can claim this is due to differences in
> >measurement times.
>
> Run Task Manager - sort by CPU and you'll see what's using what
> percentage of CPU time.
Thanks for your suggestion, Al.
Problem here is the utilities that show the very high CPU Usage do NOT
(not one of them) provide any indication of what processes are using
how much of the CPU. Therefore, what you suggest is not useful to try
to figure out how realistic are the 60-80% CPU usage figures generated
by utilities such as FreeMeter, ACPU, Everest, PCWizard and SysMon1.22
However, looking at the FreeMeter homepage, it describes what it calls
"CPU Usage" as the "percentage of time that the CPU is busy".
You commented earlier that CPU usage should always be close to 100%.
If we assume that in fact it's not normally that close in reality and
that the 60-80% numbers churned out by FreeMeter, (among others) are
truly what they claim, i.e. the percentage of time that the CPU is busy
(including doing System Idle Processes).
Then, on the other hand, if we suppose that Process Explorer (and
WinTop and Task Manager) distributes the % of the CPU use to the
various processes currently running but ONLY FOR THE TIMES THE CPU IS
BUSY, then we would have an explanation.
For this reason, the total of all the CPU time being used by the
various running processes in Process Explorer is always close to
100%---because it only makes the calculation WHEN THE CPU IS BUSY.
Indeed, it seems reasonable that it can only make this calculation when
the CPU is busy.
I would welcome any views you might have on this rather convoluted
attempt at elucidating this perhaps not so complex problem.
Paul