Re: [pcp] Combined metrics with PCP_DERIVED_CONFIG

[Martin Spier <mspier@xxxxxxxxxxx>]

Sure. I'm building an UI that will consume PCP's API and besides other things, plot the live data. One of the charts I need to draw is composed of user and sys CPU. As of now, I need to fetch two metrics,Âkernel.all.cpu.sys and kernel.all.cpu.user, each returning a separate data structure and combine them. Eg.:

{

 "timestamp": {

  "s": 1406312466,

  "us": 909502

 },

 "values": [

  {

   "pmid": 251658262,

   "name": "kernel.all.cpu.sys",

   "instances": [

    {

     "value": 3614914200

    }

   ]

  },

  {

   "pmid": 251658260,

   "name": "kernel.all.cpu.user",

   "instances": [

    {

     "value": 3165066120

    }

   ]

  }

 ]

}

And what I'm hoping to achieve is something like this:

{

 "timestamp": {

  "s": 1406312466,

  "us": 909502

 },

 "values": [

  {

   "pmid": 251658262,

   "name": "kernel.all.cpu.combined",Â

   "instances": [

    {

     "value": 3614914200,

     "instance": 1

    },

    {

     "value": 3165066120,

     "instance": 2

    }

   ]

  }

 ]

}

Wondering if it's possible to get something like this withÂPCP_DERIVED_CONFIG or something else.

Thanks,

On Thu, Jul 24, 2014 at 1:10 PM, Ken McDonell <kenj@xxxxxxxxxxxxxxxx> wrote:

On 25/07/14 02:00, Martin Spier wrote:

I know it's possible to do arithmetic operations on top of metrics to
create derived metrics, like:

kernel.all.cpu.sum = kernel.all.cpu.sys + kernel.all.cpu.user

Is it possible to combine metrics into a single metric with multiple
series? Like a derived metric with two or more series:

kernel.all.cpu.combined = [kernel.all.cpu.sys, kernel.all.cpu.user]

Sorry Martin, I don't understand the question.

What do you mean by "multiple series"?

Perhaps you could give a small example of what you'd like to achieve?

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