Re: [pcp] pcp grafana and graphite - How to convert pcp metric values into percent

[Amer Ather <aather@xxxxxxxxxxx>]

We need some additional help with derived metrics

As suggested, I created some derived CPU metrics:

kernel.pct.cpu.user = 100 * kernel.all.cpu.user / (hinv.ncpu * 1000)

kernel.pct.cpu.sys Â= 100 * kernel.all.cpu.sys / (hinv.ncpu * 1000)

kernel.pct.cpu.idle = 100 * kernel.all.cpu.idle / (hinv.ncpu * 1000)

kernel.pct.cpu.nice = 100 * kernel.all.cpu.nice / (hinv.ncpu * 1000)

kernel.pct.cpu.intr = 100 * kernel.all.cpu.intr / (hinv.ncpu * 1000)

kernel.pct.cpu.wait.total = 100 * kernel.all.cpu.wait.total / (hinv.ncpu * 1000)

...

grafana/graphite reports these values from archives correctly in percent. However, pmapi fetch returns wrong values:

http://ec2-204-236-180-248.us-west-1.compute.amazonaws.com:7002/pmapi/1121044401/_fetch?names=kernel.pct.cpu.sys,kernel.pct.cpu.user

# PCP_DERIVED_CONFIG=pctavg pminfo -f kernel.pct.cpu.user

kernel.pct.cpu.user

  value 12359528.75

What is the difference between grafana/graphite fetching from archive logs and fetching via pmapi or pminfo? How to fix it?

Thanks,

Amer.

On Sun, Jun 29, 2014 at 3:07 PM, Frank Ch. Eigler <fche@xxxxxxxxxx> wrote:

Hi -

> I tried to rebuild pmwebd with graphite support from fche git branch but
> getting errors when try building pmwebapi. Last time it built fine. Is

> there any change made to the repo? [...]

Please try again now.

> /usr/bin/ld: pmgraphite.o: undefined reference to symbol 'pthread_create@
> @GLIBC_2.2.5'

Fixed with a new commit pushed to the branch.

- FChE

--

Thanks,

Amer Ather

Cloud Performance Engineering

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