Message-Id: <201005041841.o44IfKUV38561632@zion.americas.sgi.com>
Subject: Re: [pcp] pcp Digest, Vol 16, Issue 3
To: kenj@internode.on.net
Date: Tue, 4 May 2010 13:41:20 -0500 (CDT)
Cc: pcp@oss.sgi.com
In-Reply-To: <1265318632.6030.5.camel@bozo.localdomain> from "Ken McDonell" at Feb 05, 2010 08:23:52 AM
From: David Wright <daw@sgi.com>
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Ken,

Can  I use a conditional like

if (tcp_opens < 1) then tcp_opens=0
> 
> As Jason suggests, man pmRegisterDerived is a good place to start.
> 
> Here is a small illustration by example, also.
> 
> $ cat $HOME/.pcp/derived
> tcp_opens = network.tcp.activeopens + network.tcp.passiveopens
> disk.dev.read_pct = 100 * delta(disk.dev.read) / (delta(disk.dev.read) + delta(disk.dev.write))
> 
> $ export PCP_DERIVED_CONFIG=$HOME/.pcp/derived
> 
> $ pminfo -md disk.dev.read disk.dev.read_pct
> 
> disk.dev.read PMID: 60.0.4
>     Data Type: 32-bit unsigned int  InDom: 60.1 0xf000001
>     Semantics: counter  Units: count
> 
> disk.dev.read_pct PMID: 511.0.2
>     Data Type: double  InDom: 60.1 0xf000001
>     Semantics: instant  Units: none
> 
> $ pmval tcp_opens
> 
> metric:    tcp_opens
> host:      localhost
> semantics: cumulative counter (converting to rate)
> units:     count (converting to count / sec)
> samples:   all
>      0.0   
>      0.9997   
>      0.0
> ...
> 
> Launch pmchart and you'll find disk.dev.read_pct right in the middle of
> the other disk.dev.* metrics in the metric selector.
> 
> On Thu, 2010-02-04 at 11:14 -0800, Jason Rappleye wrote:
> > Hi Dave,
> > 
> > On Feb 4, 2010, at 10:53 AM, David Wright wrote:
> > 
> > >>    - Derived metric support.
> > >
> > > IS ther documentation or a pointer for derived metrics. Been waiting
> > > for that.
> > >
> > 
> > Went digging for it this morning..."man pmRegisterDerived" is a good  
> > start, along with other man pages referenced at the end of that page.
> > 
> > j
> > 
> > > thanks,
> > > Dave Wright
> > 
> > --
> > Jason Rappleye
> > System Administrator
> > NASA Advanced Supercomputing Division
> > NASA Ames Research Center
> > Moffett Field, CA 94035
> > jason.rappleye@nasa.gov
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
> > pcp mailing list
> > pcp@oss.sgi.com
> > http://oss.sgi.com/mailman/listinfo/pcp
> 
> 
> 
>