measuring avg cpu speed while powerd(8) is running
Philip S. Schulz
ph.schulz at gmx.de
Sun Aug 7 18:39:42 GMT 2005
Joost Bekkers wrote:
> On Sat, Aug 06, 2005 at 07:33:02PM +0200, Philip S. Schulz wrote:
>>Joost Bekkers wrote:
>>>Is there a way to calculate (over eg. a 5 minute interval) the average
>>>amount the cpu was throttled? In this case by powerd(8).
> Perhaps I should have said that differently: it is being throttled by powerd.
> It doesn't have to do the measuring of the average itself.
So you're looking for a history of the CPU frequency, similar to the
history of CPU usage? I don't think the kernel keeps any such
statistics. But you should take a look at the man page or possibly the
sources of the driver you're using, e.g. est or powernow.
>>>I was thinking there might be a counter/timer which is linked to the cpu
>>>clock, but sofar I haven't been able to find one.
>>Well, you can see the current CPU frequency by looking at dev.cpu.0.freq
>>where 0 is the id of the CPU you want to query.
> At the times I take measurements the cpu tends to run at 100%, which would
> result in a nice flat line.
I don't really understand what you mean. What problem are you trying to
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