Re: [pcp] Fetch User CPU Usage as a Percentage?

[Rohan Arora <rarora2012@xxxxxxxxx>]

As far as I can tell, there is no metricConvert() function defined in pmcc.py. Is it available in the Python version of pmcc?

Thanks,

Rohan

On Wed, Jul 29, 2015 at 8:45 PM Nathan Scott <nathans@xxxxxxxxxx> wrote:

Hi Rohan,

----- Original Message -----
> Is there a way to fetch the User CPU Usage as a Percentage directly, having
> PCP take more than one sample, and doing the rate-conversion itself using
> the Python API? Currently what I am doing is running pmFetch twice for the
> "kernel.all.cpu.user". I then calculate the percentage using (val2 - val1) /
> (timestamp2 - timestamp1) * 100. Is there a way that I can just have PCP do
> this automatically? This would also be really nice for working with an
> archive, as I wouldn't have to do this for each and every result that I get.
>
> If there is not a way to get the percentage directly, is there a better way
> of going about doing this?

The pcp.pmcc module will do rate conversion for you - see the Metric class,
metricConvert() method. You'll still need to do the percentage conversion,
but that's the easy bit.

cheers.

--
Nathan